#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
-#include <linux/stat.h>
-#include <linux/time.h>
#include <linux/mm.h>
#include <linux/mman.h>
-#include <linux/a.out.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/binfmts.h>
#include <linux/string.h>
#include <linux/file.h>
-#include <linux/fcntl.h>
-#include <linux/ptrace.h>
#include <linux/slab.h>
-#include <linux/shm.h>
#include <linux/personality.h>
#include <linux/elfcore.h>
#include <linux/init.h>
#include <linux/highuid.h>
-#include <linux/smp.h>
#include <linux/compiler.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/security.h>
-#include <linux/syscalls.h>
#include <linux/random.h>
#include <linux/elf.h>
#include <linux/utsname.h>
+#include <linux/coredump.h>
#include <asm/uaccess.h>
#include <asm/param.h>
#include <asm/page.h>
static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs);
static int load_elf_library(struct file *);
-static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, int, int);
+static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
+ int, int, unsigned long);
/*
* If we don't support core dumping, then supply a NULL so we
* don't even try.
*/
-#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
-static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
+#ifdef CONFIG_ELF_CORE
+static int elf_core_dump(struct coredump_params *cprm);
#else
#define elf_core_dump NULL
#endif
#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
static struct linux_binfmt elf_format = {
- .module = THIS_MODULE,
- .load_binary = load_elf_binary,
- .load_shlib = load_elf_library,
- .core_dump = elf_core_dump,
- .min_coredump = ELF_EXEC_PAGESIZE,
- .hasvdso = 1
+ .module = THIS_MODULE,
+ .load_binary = load_elf_binary,
+ .load_shlib = load_elf_library,
+ .core_dump = elf_core_dump,
+ .min_coredump = ELF_EXEC_PAGESIZE,
};
#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
return 0;
}
-/* Let's use some macros to make this stack manipulation a litle clearer */
+/* Let's use some macros to make this stack manipulation a little clearer */
#ifdef CONFIG_STACK_GROWSUP
#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
#define STACK_ROUND(sp, items) \
#define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
#endif
+#ifndef ELF_BASE_PLATFORM
+/*
+ * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
+ * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
+ * will be copied to the user stack in the same manner as AT_PLATFORM.
+ */
+#define ELF_BASE_PLATFORM NULL
+#endif
+
static int
create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
- int interp_aout, unsigned long load_addr,
- unsigned long interp_load_addr)
+ unsigned long load_addr, unsigned long interp_load_addr)
{
unsigned long p = bprm->p;
int argc = bprm->argc;
elf_addr_t __user *envp;
elf_addr_t __user *sp;
elf_addr_t __user *u_platform;
+ elf_addr_t __user *u_base_platform;
+ elf_addr_t __user *u_rand_bytes;
const char *k_platform = ELF_PLATFORM;
+ const char *k_base_platform = ELF_BASE_PLATFORM;
+ unsigned char k_rand_bytes[16];
int items;
elf_addr_t *elf_info;
int ei_index = 0;
- struct task_struct *tsk = current;
+ const struct cred *cred = current_cred();
struct vm_area_struct *vma;
+ /*
+ * In some cases (e.g. Hyper-Threading), we want to avoid L1
+ * evictions by the processes running on the same package. One
+ * thing we can do is to shuffle the initial stack for them.
+ */
+
+ p = arch_align_stack(p);
+
/*
* If this architecture has a platform capability string, copy it
* to userspace. In some cases (Sparc), this info is impossible
if (k_platform) {
size_t len = strlen(k_platform) + 1;
- /*
- * In some cases (e.g. Hyper-Threading), we want to avoid L1
- * evictions by the processes running on the same package. One
- * thing we can do is to shuffle the initial stack for them.
- */
-
- p = arch_align_stack(p);
-
u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
if (__copy_to_user(u_platform, k_platform, len))
return -EFAULT;
}
+ /*
+ * If this architecture has a "base" platform capability
+ * string, copy it to userspace.
+ */
+ u_base_platform = NULL;
+ if (k_base_platform) {
+ size_t len = strlen(k_base_platform) + 1;
+
+ u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
+ if (__copy_to_user(u_base_platform, k_base_platform, len))
+ return -EFAULT;
+ }
+
+ /*
+ * Generate 16 random bytes for userspace PRNG seeding.
+ */
+ get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));
+ u_rand_bytes = (elf_addr_t __user *)
+ STACK_ALLOC(p, sizeof(k_rand_bytes));
+ if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes)))
+ return -EFAULT;
+
/* Create the ELF interpreter info */
elf_info = (elf_addr_t *)current->mm->saved_auxv;
+ /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
#define NEW_AUX_ENT(id, val) \
do { \
elf_info[ei_index++] = id; \
/*
* ARCH_DLINFO must come first so PPC can do its special alignment of
* AUXV.
+ * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
+ * ARCH_DLINFO changes
*/
ARCH_DLINFO;
#endif
NEW_AUX_ENT(AT_BASE, interp_load_addr);
NEW_AUX_ENT(AT_FLAGS, 0);
NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
- NEW_AUX_ENT(AT_UID, tsk->uid);
- NEW_AUX_ENT(AT_EUID, tsk->euid);
- NEW_AUX_ENT(AT_GID, tsk->gid);
- NEW_AUX_ENT(AT_EGID, tsk->egid);
+ NEW_AUX_ENT(AT_UID, cred->uid);
+ NEW_AUX_ENT(AT_EUID, cred->euid);
+ NEW_AUX_ENT(AT_GID, cred->gid);
+ NEW_AUX_ENT(AT_EGID, cred->egid);
NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
+ NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
+ NEW_AUX_ENT(AT_EXECFN, bprm->exec);
if (k_platform) {
NEW_AUX_ENT(AT_PLATFORM,
(elf_addr_t)(unsigned long)u_platform);
}
+ if (k_base_platform) {
+ NEW_AUX_ENT(AT_BASE_PLATFORM,
+ (elf_addr_t)(unsigned long)u_base_platform);
+ }
if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
}
sp = STACK_ADD(p, ei_index);
- items = (argc + 1) + (envc + 1);
- if (interp_aout) {
- items += 3; /* a.out interpreters require argv & envp too */
- } else {
- items += 1; /* ELF interpreters only put argc on the stack */
- }
+ items = (argc + 1) + (envc + 1) + 1;
bprm->p = STACK_ROUND(sp, items);
/* Point sp at the lowest address on the stack */
/* Now, let's put argc (and argv, envp if appropriate) on the stack */
if (__put_user(argc, sp++))
return -EFAULT;
- if (interp_aout) {
- argv = sp + 2;
- envp = argv + argc + 1;
- if (__put_user((elf_addr_t)(unsigned long)argv, sp++) ||
- __put_user((elf_addr_t)(unsigned long)envp, sp++))
- return -EFAULT;
- } else {
- argv = sp;
- envp = argv + argc + 1;
- }
+ argv = sp;
+ envp = argv + argc + 1;
/* Populate argv and envp */
p = current->mm->arg_end = current->mm->arg_start;
return -EFAULT;
len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
if (!len || len > MAX_ARG_STRLEN)
- return 0;
+ return -EINVAL;
p += len;
}
if (__put_user(0, argv))
return -EFAULT;
len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
if (!len || len > MAX_ARG_STRLEN)
- return 0;
+ return -EINVAL;
p += len;
}
if (__put_user(0, envp))
return 0;
}
-#ifndef elf_map
-
static unsigned long elf_map(struct file *filep, unsigned long addr,
- struct elf_phdr *eppnt, int prot, int type)
+ struct elf_phdr *eppnt, int prot, int type,
+ unsigned long total_size)
{
unsigned long map_addr;
- unsigned long pageoffset = ELF_PAGEOFFSET(eppnt->p_vaddr);
+ unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr);
+ unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
+ addr = ELF_PAGESTART(addr);
+ size = ELF_PAGEALIGN(size);
- down_write(¤t->mm->mmap_sem);
/* mmap() will return -EINVAL if given a zero size, but a
* segment with zero filesize is perfectly valid */
- if (eppnt->p_filesz + pageoffset)
- map_addr = do_mmap(filep, ELF_PAGESTART(addr),
- eppnt->p_filesz + pageoffset, prot, type,
- eppnt->p_offset - pageoffset);
- else
- map_addr = ELF_PAGESTART(addr);
+ if (!size)
+ return addr;
+
+ down_write(¤t->mm->mmap_sem);
+ /*
+ * total_size is the size of the ELF (interpreter) image.
+ * The _first_ mmap needs to know the full size, otherwise
+ * randomization might put this image into an overlapping
+ * position with the ELF binary image. (since size < total_size)
+ * So we first map the 'big' image - and unmap the remainder at
+ * the end. (which unmap is needed for ELF images with holes.)
+ */
+ if (total_size) {
+ total_size = ELF_PAGEALIGN(total_size);
+ map_addr = do_mmap(filep, addr, total_size, prot, type, off);
+ if (!BAD_ADDR(map_addr))
+ do_munmap(current->mm, map_addr+size, total_size-size);
+ } else
+ map_addr = do_mmap(filep, addr, size, prot, type, off);
+
up_write(¤t->mm->mmap_sem);
return(map_addr);
}
-#endif /* !elf_map */
+static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr)
+{
+ int i, first_idx = -1, last_idx = -1;
+
+ for (i = 0; i < nr; i++) {
+ if (cmds[i].p_type == PT_LOAD) {
+ last_idx = i;
+ if (first_idx == -1)
+ first_idx = i;
+ }
+ }
+ if (first_idx == -1)
+ return 0;
+
+ return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz -
+ ELF_PAGESTART(cmds[first_idx].p_vaddr);
+}
+
/* This is much more generalized than the library routine read function,
so we keep this separate. Technically the library read function
an ELF header */
static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
- struct file *interpreter, unsigned long *interp_load_addr)
+ struct file *interpreter, unsigned long *interp_map_addr,
+ unsigned long no_base)
{
struct elf_phdr *elf_phdata;
struct elf_phdr *eppnt;
int load_addr_set = 0;
unsigned long last_bss = 0, elf_bss = 0;
unsigned long error = ~0UL;
+ unsigned long total_size;
int retval, i, size;
/* First of all, some simple consistency checks */
goto out;
retval = kernel_read(interpreter, interp_elf_ex->e_phoff,
- (char *)elf_phdata,size);
+ (char *)elf_phdata, size);
error = -EIO;
if (retval != size) {
if (retval < 0)
goto out_close;
}
+ total_size = total_mapping_size(elf_phdata, interp_elf_ex->e_phnum);
+ if (!total_size) {
+ error = -EINVAL;
+ goto out_close;
+ }
+
eppnt = elf_phdata;
for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
if (eppnt->p_type == PT_LOAD) {
vaddr = eppnt->p_vaddr;
if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
elf_type |= MAP_FIXED;
+ else if (no_base && interp_elf_ex->e_type == ET_DYN)
+ load_addr = -vaddr;
map_addr = elf_map(interpreter, load_addr + vaddr,
- eppnt, elf_prot, elf_type);
+ eppnt, elf_prot, elf_type, total_size);
+ total_size = 0;
+ if (!*interp_map_addr)
+ *interp_map_addr = map_addr;
error = map_addr;
if (BAD_ADDR(map_addr))
goto out_close;
}
}
- /*
- * Now fill out the bss section. First pad the last page up
- * to the page boundary, and then perform a mmap to make sure
- * that there are zero-mapped pages up to and including the
- * last bss page.
- */
- if (padzero(elf_bss)) {
- error = -EFAULT;
- goto out_close;
- }
+ if (last_bss > elf_bss) {
+ /*
+ * Now fill out the bss section. First pad the last page up
+ * to the page boundary, and then perform a mmap to make sure
+ * that there are zero-mapped pages up to and including the
+ * last bss page.
+ */
+ if (padzero(elf_bss)) {
+ error = -EFAULT;
+ goto out_close;
+ }
- /* What we have mapped so far */
- elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
+ /* What we have mapped so far */
+ elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
- /* Map the last of the bss segment */
- if (last_bss > elf_bss) {
+ /* Map the last of the bss segment */
down_write(¤t->mm->mmap_sem);
error = do_brk(elf_bss, last_bss - elf_bss);
up_write(¤t->mm->mmap_sem);
goto out_close;
}
- *interp_load_addr = load_addr;
- error = ((unsigned long)interp_elf_ex->e_entry) + load_addr;
+ error = load_addr;
out_close:
kfree(elf_phdata);
return error;
}
-static unsigned long load_aout_interp(struct exec *interp_ex,
- struct file *interpreter)
-{
- unsigned long text_data, elf_entry = ~0UL;
- char __user * addr;
- loff_t offset;
-
- current->mm->end_code = interp_ex->a_text;
- text_data = interp_ex->a_text + interp_ex->a_data;
- current->mm->end_data = text_data;
- current->mm->brk = interp_ex->a_bss + text_data;
-
- switch (N_MAGIC(*interp_ex)) {
- case OMAGIC:
- offset = 32;
- addr = (char __user *)0;
- break;
- case ZMAGIC:
- case QMAGIC:
- offset = N_TXTOFF(*interp_ex);
- addr = (char __user *)N_TXTADDR(*interp_ex);
- break;
- default:
- goto out;
- }
-
- down_write(¤t->mm->mmap_sem);
- do_brk(0, text_data);
- up_write(¤t->mm->mmap_sem);
- if (!interpreter->f_op || !interpreter->f_op->read)
- goto out;
- if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0)
- goto out;
- flush_icache_range((unsigned long)addr,
- (unsigned long)addr + text_data);
-
- down_write(¤t->mm->mmap_sem);
- do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
- interp_ex->a_bss);
- up_write(¤t->mm->mmap_sem);
- elf_entry = interp_ex->a_entry;
-
-out:
- return elf_entry;
-}
-
/*
* These are the functions used to load ELF style executables and shared
* libraries. There is no binary dependent code anywhere else.
*/
#define INTERPRETER_NONE 0
-#define INTERPRETER_AOUT 1
#define INTERPRETER_ELF 2
#ifndef STACK_RND_MASK
unsigned long load_addr = 0, load_bias = 0;
int load_addr_set = 0;
char * elf_interpreter = NULL;
- unsigned int interpreter_type = INTERPRETER_NONE;
- unsigned char ibcs2_interpreter = 0;
unsigned long error;
struct elf_phdr *elf_ppnt, *elf_phdata;
unsigned long elf_bss, elf_brk;
- int elf_exec_fileno;
int retval, i;
unsigned int size;
- unsigned long elf_entry, interp_load_addr = 0;
+ unsigned long elf_entry;
+ unsigned long interp_load_addr = 0;
unsigned long start_code, end_code, start_data, end_data;
- unsigned long reloc_func_desc = 0;
- char passed_fileno[6];
- struct files_struct *files;
+ unsigned long reloc_func_desc __maybe_unused = 0;
int executable_stack = EXSTACK_DEFAULT;
unsigned long def_flags = 0;
struct {
struct elfhdr elf_ex;
struct elfhdr interp_elf_ex;
- struct exec interp_ex;
} *loc;
loc = kmalloc(sizeof(*loc), GFP_KERNEL);
goto out;
if (!elf_check_arch(&loc->elf_ex))
goto out;
- if (!bprm->file->f_op||!bprm->file->f_op->mmap)
+ if (!bprm->file->f_op || !bprm->file->f_op->mmap)
goto out;
/* Now read in all of the header information */
goto out_free_ph;
}
- files = current->files; /* Refcounted so ok */
- retval = unshare_files();
- if (retval < 0)
- goto out_free_ph;
- if (files == current->files) {
- put_files_struct(files);
- files = NULL;
- }
-
- /* exec will make our files private anyway, but for the a.out
- loader stuff we need to do it earlier */
- retval = get_unused_fd();
- if (retval < 0)
- goto out_free_fh;
- get_file(bprm->file);
- fd_install(elf_exec_fileno = retval, bprm->file);
-
elf_ppnt = elf_phdata;
elf_bss = 0;
elf_brk = 0;
retval = -ENOEXEC;
if (elf_ppnt->p_filesz > PATH_MAX ||
elf_ppnt->p_filesz < 2)
- goto out_free_file;
+ goto out_free_ph;
retval = -ENOMEM;
elf_interpreter = kmalloc(elf_ppnt->p_filesz,
GFP_KERNEL);
if (!elf_interpreter)
- goto out_free_file;
+ goto out_free_ph;
retval = kernel_read(bprm->file, elf_ppnt->p_offset,
elf_interpreter,
if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
goto out_free_interp;
- /* If the program interpreter is one of these two,
- * then assume an iBCS2 image. Otherwise assume
- * a native linux image.
- */
- if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
- strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0)
- ibcs2_interpreter = 1;
-
- /*
- * The early SET_PERSONALITY here is so that the lookup
- * for the interpreter happens in the namespace of the
- * to-be-execed image. SET_PERSONALITY can select an
- * alternate root.
- *
- * However, SET_PERSONALITY is NOT allowed to switch
- * this task into the new images's memory mapping
- * policy - that is, TASK_SIZE must still evaluate to
- * that which is appropriate to the execing application.
- * This is because exit_mmap() needs to have TASK_SIZE
- * evaluate to the size of the old image.
- *
- * So if (say) a 64-bit application is execing a 32-bit
- * application it is the architecture's responsibility
- * to defer changing the value of TASK_SIZE until the
- * switch really is going to happen - do this in
- * flush_thread(). - akpm
- */
- SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
-
interpreter = open_exec(elf_interpreter);
retval = PTR_ERR(interpreter);
if (IS_ERR(interpreter))
* mm->dumpable = 0 regardless of the interpreter's
* permissions.
*/
- if (file_permission(interpreter, MAY_READ) < 0)
- bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
+ would_dump(bprm, interpreter);
retval = kernel_read(interpreter, 0, bprm->buf,
BINPRM_BUF_SIZE);
}
/* Get the exec headers */
- loc->interp_ex = *((struct exec *)bprm->buf);
loc->interp_elf_ex = *((struct elfhdr *)bprm->buf);
break;
}
/* Some simple consistency checks for the interpreter */
if (elf_interpreter) {
- interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
-
- /* Now figure out which format our binary is */
- if ((N_MAGIC(loc->interp_ex) != OMAGIC) &&
- (N_MAGIC(loc->interp_ex) != ZMAGIC) &&
- (N_MAGIC(loc->interp_ex) != QMAGIC))
- interpreter_type = INTERPRETER_ELF;
-
- if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
- interpreter_type &= ~INTERPRETER_ELF;
-
retval = -ELIBBAD;
- if (!interpreter_type)
+ /* Not an ELF interpreter */
+ if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
goto out_free_dentry;
-
- /* Make sure only one type was selected */
- if ((interpreter_type & INTERPRETER_ELF) &&
- interpreter_type != INTERPRETER_ELF) {
- // FIXME - ratelimit this before re-enabling
- // printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n");
- interpreter_type = INTERPRETER_ELF;
- }
/* Verify the interpreter has a valid arch */
- if ((interpreter_type == INTERPRETER_ELF) &&
- !elf_check_arch(&loc->interp_elf_ex))
+ if (!elf_check_arch(&loc->interp_elf_ex))
goto out_free_dentry;
- } else {
- /* Executables without an interpreter also need a personality */
- SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
- }
-
- /* OK, we are done with that, now set up the arg stuff,
- and then start this sucker up */
- if ((!bprm->sh_bang) && (interpreter_type == INTERPRETER_AOUT)) {
- char *passed_p = passed_fileno;
- sprintf(passed_fileno, "%d", elf_exec_fileno);
-
- if (elf_interpreter) {
- retval = copy_strings_kernel(1, &passed_p, bprm);
- if (retval)
- goto out_free_dentry;
- bprm->argc++;
- }
}
/* Flush all traces of the currently running executable */
if (retval)
goto out_free_dentry;
- /* Discard our unneeded old files struct */
- if (files) {
- put_files_struct(files);
- files = NULL;
- }
-
/* OK, This is the point of no return */
current->flags &= ~PF_FORKNOEXEC;
current->mm->def_flags = def_flags;
/* Do this immediately, since STACK_TOP as used in setup_arg_pages
may depend on the personality. */
- SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
+ SET_PERSONALITY(loc->elf_ex);
if (elf_read_implies_exec(loc->elf_ex, executable_stack))
current->personality |= READ_IMPLIES_EXEC;
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
current->flags |= PF_RANDOMIZE;
- arch_pick_mmap_layout(current->mm);
+
+ setup_new_exec(bprm);
/* Do this so that we can load the interpreter, if need be. We will
change some of these later */
current->mm->start_stack = bprm->p;
- /* Now we do a little grungy work by mmaping the ELF image into
- the correct location in memory. At this point, we assume that
- the image should be loaded at fixed address, not at a variable
- address. */
+ /* Now we do a little grungy work by mmapping the ELF image into
+ the correct location in memory. */
for(i = 0, elf_ppnt = elf_phdata;
i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
int elf_prot = 0, elf_flags;
/* There was a PT_LOAD segment with p_memsz > p_filesz
before this one. Map anonymous pages, if needed,
and clear the area. */
- retval = set_brk (elf_bss + load_bias,
- elf_brk + load_bias);
+ retval = set_brk(elf_bss + load_bias,
+ elf_brk + load_bias);
if (retval) {
send_sig(SIGKILL, current, 0);
goto out_free_dentry;
* default mmap base, as well as whatever program they
* might try to exec. This is because the brk will
* follow the loader, and is not movable. */
+#if defined(CONFIG_X86) || defined(CONFIG_ARM)
+ /* Memory randomization might have been switched off
+ * in runtime via sysctl.
+ * If that is the case, retain the original non-zero
+ * load_bias value in order to establish proper
+ * non-randomized mappings.
+ */
+ if (current->flags & PF_RANDOMIZE)
+ load_bias = 0;
+ else
+ load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
+#else
load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
+#endif
}
error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
- elf_prot, elf_flags);
+ elf_prot, elf_flags, 0);
if (BAD_ADDR(error)) {
send_sig(SIGKILL, current, 0);
retval = IS_ERR((void *)error) ?
}
if (elf_interpreter) {
- if (interpreter_type == INTERPRETER_AOUT)
- elf_entry = load_aout_interp(&loc->interp_ex,
- interpreter);
- else
- elf_entry = load_elf_interp(&loc->interp_elf_ex,
- interpreter,
- &interp_load_addr);
+ unsigned long uninitialized_var(interp_map_addr);
+
+ elf_entry = load_elf_interp(&loc->interp_elf_ex,
+ interpreter,
+ &interp_map_addr,
+ load_bias);
+ if (!IS_ERR((void *)elf_entry)) {
+ /*
+ * load_elf_interp() returns relocation
+ * adjustment
+ */
+ interp_load_addr = elf_entry;
+ elf_entry += loc->interp_elf_ex.e_entry;
+ }
if (BAD_ADDR(elf_entry)) {
force_sig(SIGSEGV, current);
retval = IS_ERR((void *)elf_entry) ?
kfree(elf_phdata);
- if (interpreter_type != INTERPRETER_AOUT)
- sys_close(elf_exec_fileno);
-
set_binfmt(&elf_format);
#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
- retval = arch_setup_additional_pages(bprm, executable_stack);
+ retval = arch_setup_additional_pages(bprm, !!elf_interpreter);
if (retval < 0) {
send_sig(SIGKILL, current, 0);
goto out;
}
#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
- compute_creds(bprm);
+ install_exec_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
retval = create_elf_tables(bprm, &loc->elf_ex,
- (interpreter_type == INTERPRETER_AOUT),
load_addr, interp_load_addr);
if (retval < 0) {
send_sig(SIGKILL, current, 0);
goto out;
}
/* N.B. passed_fileno might not be initialized? */
- if (interpreter_type == INTERPRETER_AOUT)
- current->mm->arg_start += strlen(passed_fileno) + 1;
current->mm->end_code = end_code;
current->mm->start_code = start_code;
current->mm->start_data = start_data;
current->mm->end_data = end_data;
current->mm->start_stack = bprm->p;
+#ifdef arch_randomize_brk
+ if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
+ current->mm->brk = current->mm->start_brk =
+ arch_randomize_brk(current->mm);
+#ifdef CONFIG_COMPAT_BRK
+ current->brk_randomized = 1;
+#endif
+ }
+#endif
+
if (current->personality & MMAP_PAGE_ZERO) {
/* Why this, you ask??? Well SVr4 maps page 0 as read-only,
and some applications "depend" upon this behavior.
#endif
start_thread(regs, elf_entry, bprm->p);
- if (unlikely(current->ptrace & PT_PTRACED)) {
- if (current->ptrace & PT_TRACE_EXEC)
- ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
- else
- send_sig(SIGTRAP, current, 0);
- }
retval = 0;
out:
kfree(loc);
fput(interpreter);
out_free_interp:
kfree(elf_interpreter);
-out_free_file:
- sys_close(elf_exec_fileno);
-out_free_fh:
- if (files)
- reset_files_struct(current, files);
out_free_ph:
kfree(elf_phdata);
goto out;
return error;
}
-/*
- * Note that some platforms still use traditional core dumps and not
- * the ELF core dump. Each platform can select it as appropriate.
- */
-#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
-
+#ifdef CONFIG_ELF_CORE
/*
* ELF core dumper
*
* Modelled on fs/exec.c:aout_core_dump()
* Jeremy Fitzhardinge <jeremy@sw.oz.au>
*/
-/*
- * These are the only things you should do on a core-file: use only these
- * functions to write out all the necessary info.
- */
-static int dump_write(struct file *file, const void *addr, int nr)
-{
- return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
-}
-
-static int dump_seek(struct file *file, loff_t off)
-{
- if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
- if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
- return 0;
- } else {
- char *buf = (char *)get_zeroed_page(GFP_KERNEL);
- if (!buf)
- return 0;
- while (off > 0) {
- unsigned long n = off;
- if (n > PAGE_SIZE)
- n = PAGE_SIZE;
- if (!dump_write(file, buf, n))
- return 0;
- off -= n;
- }
- free_page((unsigned long)buf);
- }
- return 1;
-}
/*
- * Decide whether a segment is worth dumping; default is yes to be
- * sure (missing info is worse than too much; etc).
- * Personally I'd include everything, and use the coredump limit...
- *
- * I think we should skip something. But I am not sure how. H.J.
+ * Decide what to dump of a segment, part, all or none.
*/
-static int maydump(struct vm_area_struct *vma, unsigned long mm_flags)
+static unsigned long vma_dump_size(struct vm_area_struct *vma,
+ unsigned long mm_flags)
{
+#define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type))
+
/* The vma can be set up to tell us the answer directly. */
if (vma->vm_flags & VM_ALWAYSDUMP)
- return 1;
+ goto whole;
+
+ /* Hugetlb memory check */
+ if (vma->vm_flags & VM_HUGETLB) {
+ if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED))
+ goto whole;
+ if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE))
+ goto whole;
+ }
/* Do not dump I/O mapped devices or special mappings */
if (vma->vm_flags & (VM_IO | VM_RESERVED))
/* By default, dump shared memory if mapped from an anonymous file. */
if (vma->vm_flags & VM_SHARED) {
- if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0)
- return test_bit(MMF_DUMP_ANON_SHARED, &mm_flags);
- else
- return test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags);
+ if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0 ?
+ FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED))
+ goto whole;
+ return 0;
+ }
+
+ /* Dump segments that have been written to. */
+ if (vma->anon_vma && FILTER(ANON_PRIVATE))
+ goto whole;
+ if (vma->vm_file == NULL)
+ return 0;
+
+ if (FILTER(MAPPED_PRIVATE))
+ goto whole;
+
+ /*
+ * If this looks like the beginning of a DSO or executable mapping,
+ * check for an ELF header. If we find one, dump the first page to
+ * aid in determining what was mapped here.
+ */
+ if (FILTER(ELF_HEADERS) &&
+ vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
+ u32 __user *header = (u32 __user *) vma->vm_start;
+ u32 word;
+ mm_segment_t fs = get_fs();
+ /*
+ * Doing it this way gets the constant folded by GCC.
+ */
+ union {
+ u32 cmp;
+ char elfmag[SELFMAG];
+ } magic;
+ BUILD_BUG_ON(SELFMAG != sizeof word);
+ magic.elfmag[EI_MAG0] = ELFMAG0;
+ magic.elfmag[EI_MAG1] = ELFMAG1;
+ magic.elfmag[EI_MAG2] = ELFMAG2;
+ magic.elfmag[EI_MAG3] = ELFMAG3;
+ /*
+ * Switch to the user "segment" for get_user(),
+ * then put back what elf_core_dump() had in place.
+ */
+ set_fs(USER_DS);
+ if (unlikely(get_user(word, header)))
+ word = 0;
+ set_fs(fs);
+ if (word == magic.cmp)
+ return PAGE_SIZE;
}
- /* By default, if it hasn't been written to, don't write it out. */
- if (!vma->anon_vma)
- return test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags);
+#undef FILTER
- return test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags);
+ return 0;
+
+whole:
+ return vma->vm_end - vma->vm_start;
}
/* An ELF note in memory */
}
#undef DUMP_WRITE
-#define DUMP_WRITE(addr, nr) \
- if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
- goto end_coredump;
-#define DUMP_SEEK(off) \
- if (!dump_seek(file, (off))) \
- goto end_coredump;
-
-static void fill_elf_header(struct elfhdr *elf, int segs)
+static void fill_elf_header(struct elfhdr *elf, int segs,
+ u16 machine, u32 flags, u8 osabi)
{
+ memset(elf, 0, sizeof(*elf));
+
memcpy(elf->e_ident, ELFMAG, SELFMAG);
elf->e_ident[EI_CLASS] = ELF_CLASS;
elf->e_ident[EI_DATA] = ELF_DATA;
elf->e_ident[EI_VERSION] = EV_CURRENT;
elf->e_ident[EI_OSABI] = ELF_OSABI;
- memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
elf->e_type = ET_CORE;
- elf->e_machine = ELF_ARCH;
+ elf->e_machine = machine;
elf->e_version = EV_CURRENT;
- elf->e_entry = 0;
elf->e_phoff = sizeof(struct elfhdr);
- elf->e_shoff = 0;
- elf->e_flags = ELF_CORE_EFLAGS;
+ elf->e_flags = flags;
elf->e_ehsize = sizeof(struct elfhdr);
elf->e_phentsize = sizeof(struct elf_phdr);
elf->e_phnum = segs;
- elf->e_shentsize = 0;
- elf->e_shnum = 0;
- elf->e_shstrndx = 0;
+
return;
}
prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
prstatus->pr_sigpend = p->pending.signal.sig[0];
prstatus->pr_sighold = p->blocked.sig[0];
- prstatus->pr_pid = p->pid;
- prstatus->pr_ppid = p->parent->pid;
- prstatus->pr_pgrp = process_group(p);
- prstatus->pr_sid = process_session(p);
+ rcu_read_lock();
+ prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
+ rcu_read_unlock();
+ prstatus->pr_pid = task_pid_vnr(p);
+ prstatus->pr_pgrp = task_pgrp_vnr(p);
+ prstatus->pr_sid = task_session_vnr(p);
if (thread_group_leader(p)) {
+ struct task_cputime cputime;
+
/*
- * This is the record for the group leader. Add in the
- * cumulative times of previous dead threads. This total
- * won't include the time of each live thread whose state
- * is included in the core dump. The final total reported
- * to our parent process when it calls wait4 will include
- * those sums as well as the little bit more time it takes
- * this and each other thread to finish dying after the
- * core dump synchronization phase.
+ * This is the record for the group leader. It shows the
+ * group-wide total, not its individual thread total.
*/
- cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
- &prstatus->pr_utime);
- cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
- &prstatus->pr_stime);
+ thread_group_cputime(p, &cputime);
+ cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
+ cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
} else {
cputime_to_timeval(p->utime, &prstatus->pr_utime);
cputime_to_timeval(p->stime, &prstatus->pr_stime);
static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
struct mm_struct *mm)
{
+ const struct cred *cred;
unsigned int i, len;
/* first copy the parameters from user space */
psinfo->pr_psargs[i] = ' ';
psinfo->pr_psargs[len] = 0;
- psinfo->pr_pid = p->pid;
- psinfo->pr_ppid = p->parent->pid;
- psinfo->pr_pgrp = process_group(p);
- psinfo->pr_sid = process_session(p);
+ rcu_read_lock();
+ psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
+ rcu_read_unlock();
+ psinfo->pr_pid = task_pid_vnr(p);
+ psinfo->pr_pgrp = task_pgrp_vnr(p);
+ psinfo->pr_sid = task_session_vnr(p);
i = p->state ? ffz(~p->state) + 1 : 0;
psinfo->pr_state = i;
psinfo->pr_zomb = psinfo->pr_sname == 'Z';
psinfo->pr_nice = task_nice(p);
psinfo->pr_flag = p->flags;
- SET_UID(psinfo->pr_uid, p->uid);
- SET_GID(psinfo->pr_gid, p->gid);
+ rcu_read_lock();
+ cred = __task_cred(p);
+ SET_UID(psinfo->pr_uid, cred->uid);
+ SET_GID(psinfo->pr_gid, cred->gid);
+ rcu_read_unlock();
strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
return 0;
}
+static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
+{
+ elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
+ int i = 0;
+ do
+ i += 2;
+ while (auxv[i - 2] != AT_NULL);
+ fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
+}
+
+#ifdef CORE_DUMP_USE_REGSET
+#include <linux/regset.h>
+
+struct elf_thread_core_info {
+ struct elf_thread_core_info *next;
+ struct task_struct *task;
+ struct elf_prstatus prstatus;
+ struct memelfnote notes[0];
+};
+
+struct elf_note_info {
+ struct elf_thread_core_info *thread;
+ struct memelfnote psinfo;
+ struct memelfnote auxv;
+ size_t size;
+ int thread_notes;
+};
+
+/*
+ * When a regset has a writeback hook, we call it on each thread before
+ * dumping user memory. On register window machines, this makes sure the
+ * user memory backing the register data is up to date before we read it.
+ */
+static void do_thread_regset_writeback(struct task_struct *task,
+ const struct user_regset *regset)
+{
+ if (regset->writeback)
+ regset->writeback(task, regset, 1);
+}
+
+static int fill_thread_core_info(struct elf_thread_core_info *t,
+ const struct user_regset_view *view,
+ long signr, size_t *total)
+{
+ unsigned int i;
+
+ /*
+ * NT_PRSTATUS is the one special case, because the regset data
+ * goes into the pr_reg field inside the note contents, rather
+ * than being the whole note contents. We fill the reset in here.
+ * We assume that regset 0 is NT_PRSTATUS.
+ */
+ fill_prstatus(&t->prstatus, t->task, signr);
+ (void) view->regsets[0].get(t->task, &view->regsets[0],
+ 0, sizeof(t->prstatus.pr_reg),
+ &t->prstatus.pr_reg, NULL);
+
+ fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
+ sizeof(t->prstatus), &t->prstatus);
+ *total += notesize(&t->notes[0]);
+
+ do_thread_regset_writeback(t->task, &view->regsets[0]);
+
+ /*
+ * Each other regset might generate a note too. For each regset
+ * that has no core_note_type or is inactive, we leave t->notes[i]
+ * all zero and we'll know to skip writing it later.
+ */
+ for (i = 1; i < view->n; ++i) {
+ const struct user_regset *regset = &view->regsets[i];
+ do_thread_regset_writeback(t->task, regset);
+ if (regset->core_note_type &&
+ (!regset->active || regset->active(t->task, regset))) {
+ int ret;
+ size_t size = regset->n * regset->size;
+ void *data = kmalloc(size, GFP_KERNEL);
+ if (unlikely(!data))
+ return 0;
+ ret = regset->get(t->task, regset,
+ 0, size, data, NULL);
+ if (unlikely(ret))
+ kfree(data);
+ else {
+ if (regset->core_note_type != NT_PRFPREG)
+ fill_note(&t->notes[i], "LINUX",
+ regset->core_note_type,
+ size, data);
+ else {
+ t->prstatus.pr_fpvalid = 1;
+ fill_note(&t->notes[i], "CORE",
+ NT_PRFPREG, size, data);
+ }
+ *total += notesize(&t->notes[i]);
+ }
+ }
+ }
+
+ return 1;
+}
+
+static int fill_note_info(struct elfhdr *elf, int phdrs,
+ struct elf_note_info *info,
+ long signr, struct pt_regs *regs)
+{
+ struct task_struct *dump_task = current;
+ const struct user_regset_view *view = task_user_regset_view(dump_task);
+ struct elf_thread_core_info *t;
+ struct elf_prpsinfo *psinfo;
+ struct core_thread *ct;
+ unsigned int i;
+
+ info->size = 0;
+ info->thread = NULL;
+
+ psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
+ if (psinfo == NULL)
+ return 0;
+
+ fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
+
+ /*
+ * Figure out how many notes we're going to need for each thread.
+ */
+ info->thread_notes = 0;
+ for (i = 0; i < view->n; ++i)
+ if (view->regsets[i].core_note_type != 0)
+ ++info->thread_notes;
+
+ /*
+ * Sanity check. We rely on regset 0 being in NT_PRSTATUS,
+ * since it is our one special case.
+ */
+ if (unlikely(info->thread_notes == 0) ||
+ unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) {
+ WARN_ON(1);
+ return 0;
+ }
+
+ /*
+ * Initialize the ELF file header.
+ */
+ fill_elf_header(elf, phdrs,
+ view->e_machine, view->e_flags, view->ei_osabi);
+
+ /*
+ * Allocate a structure for each thread.
+ */
+ for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
+ t = kzalloc(offsetof(struct elf_thread_core_info,
+ notes[info->thread_notes]),
+ GFP_KERNEL);
+ if (unlikely(!t))
+ return 0;
+
+ t->task = ct->task;
+ if (ct->task == dump_task || !info->thread) {
+ t->next = info->thread;
+ info->thread = t;
+ } else {
+ /*
+ * Make sure to keep the original task at
+ * the head of the list.
+ */
+ t->next = info->thread->next;
+ info->thread->next = t;
+ }
+ }
+
+ /*
+ * Now fill in each thread's information.
+ */
+ for (t = info->thread; t != NULL; t = t->next)
+ if (!fill_thread_core_info(t, view, signr, &info->size))
+ return 0;
+
+ /*
+ * Fill in the two process-wide notes.
+ */
+ fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm);
+ info->size += notesize(&info->psinfo);
+
+ fill_auxv_note(&info->auxv, current->mm);
+ info->size += notesize(&info->auxv);
+
+ return 1;
+}
+
+static size_t get_note_info_size(struct elf_note_info *info)
+{
+ return info->size;
+}
+
+/*
+ * Write all the notes for each thread. When writing the first thread, the
+ * process-wide notes are interleaved after the first thread-specific note.
+ */
+static int write_note_info(struct elf_note_info *info,
+ struct file *file, loff_t *foffset)
+{
+ bool first = 1;
+ struct elf_thread_core_info *t = info->thread;
+
+ do {
+ int i;
+
+ if (!writenote(&t->notes[0], file, foffset))
+ return 0;
+
+ if (first && !writenote(&info->psinfo, file, foffset))
+ return 0;
+ if (first && !writenote(&info->auxv, file, foffset))
+ return 0;
+
+ for (i = 1; i < info->thread_notes; ++i)
+ if (t->notes[i].data &&
+ !writenote(&t->notes[i], file, foffset))
+ return 0;
+
+ first = 0;
+ t = t->next;
+ } while (t);
+
+ return 1;
+}
+
+static void free_note_info(struct elf_note_info *info)
+{
+ struct elf_thread_core_info *threads = info->thread;
+ while (threads) {
+ unsigned int i;
+ struct elf_thread_core_info *t = threads;
+ threads = t->next;
+ WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus);
+ for (i = 1; i < info->thread_notes; ++i)
+ kfree(t->notes[i].data);
+ kfree(t);
+ }
+ kfree(info->psinfo.data);
+}
+
+#else
+
/* Here is the structure in which status of each thread is captured. */
struct elf_thread_status
{
return sz;
}
+struct elf_note_info {
+ struct memelfnote *notes;
+ struct elf_prstatus *prstatus; /* NT_PRSTATUS */
+ struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */
+ struct list_head thread_list;
+ elf_fpregset_t *fpu;
+#ifdef ELF_CORE_COPY_XFPREGS
+ elf_fpxregset_t *xfpu;
+#endif
+ int thread_status_size;
+ int numnote;
+};
+
+static int elf_note_info_init(struct elf_note_info *info)
+{
+ memset(info, 0, sizeof(*info));
+ INIT_LIST_HEAD(&info->thread_list);
+
+ /* Allocate space for six ELF notes */
+ info->notes = kmalloc(6 * sizeof(struct memelfnote), GFP_KERNEL);
+ if (!info->notes)
+ return 0;
+ info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
+ if (!info->psinfo)
+ goto notes_free;
+ info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
+ if (!info->prstatus)
+ goto psinfo_free;
+ info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
+ if (!info->fpu)
+ goto prstatus_free;
+#ifdef ELF_CORE_COPY_XFPREGS
+ info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
+ if (!info->xfpu)
+ goto fpu_free;
+#endif
+ return 1;
+#ifdef ELF_CORE_COPY_XFPREGS
+ fpu_free:
+ kfree(info->fpu);
+#endif
+ prstatus_free:
+ kfree(info->prstatus);
+ psinfo_free:
+ kfree(info->psinfo);
+ notes_free:
+ kfree(info->notes);
+ return 0;
+}
+
+static int fill_note_info(struct elfhdr *elf, int phdrs,
+ struct elf_note_info *info,
+ long signr, struct pt_regs *regs)
+{
+ struct list_head *t;
+
+ if (!elf_note_info_init(info))
+ return 0;
+
+ if (signr) {
+ struct core_thread *ct;
+ struct elf_thread_status *ets;
+
+ for (ct = current->mm->core_state->dumper.next;
+ ct; ct = ct->next) {
+ ets = kzalloc(sizeof(*ets), GFP_KERNEL);
+ if (!ets)
+ return 0;
+
+ ets->thread = ct->task;
+ list_add(&ets->list, &info->thread_list);
+ }
+
+ list_for_each(t, &info->thread_list) {
+ int sz;
+
+ ets = list_entry(t, struct elf_thread_status, list);
+ sz = elf_dump_thread_status(signr, ets);
+ info->thread_status_size += sz;
+ }
+ }
+ /* now collect the dump for the current */
+ memset(info->prstatus, 0, sizeof(*info->prstatus));
+ fill_prstatus(info->prstatus, current, signr);
+ elf_core_copy_regs(&info->prstatus->pr_reg, regs);
+
+ /* Set up header */
+ fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS, ELF_OSABI);
+
+ /*
+ * Set up the notes in similar form to SVR4 core dumps made
+ * with info from their /proc.
+ */
+
+ fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
+ sizeof(*info->prstatus), info->prstatus);
+ fill_psinfo(info->psinfo, current->group_leader, current->mm);
+ fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
+ sizeof(*info->psinfo), info->psinfo);
+
+ info->numnote = 2;
+
+ fill_auxv_note(&info->notes[info->numnote++], current->mm);
+
+ /* Try to dump the FPU. */
+ info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
+ info->fpu);
+ if (info->prstatus->pr_fpvalid)
+ fill_note(info->notes + info->numnote++,
+ "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
+#ifdef ELF_CORE_COPY_XFPREGS
+ if (elf_core_copy_task_xfpregs(current, info->xfpu))
+ fill_note(info->notes + info->numnote++,
+ "LINUX", ELF_CORE_XFPREG_TYPE,
+ sizeof(*info->xfpu), info->xfpu);
+#endif
+
+ return 1;
+}
+
+static size_t get_note_info_size(struct elf_note_info *info)
+{
+ int sz = 0;
+ int i;
+
+ for (i = 0; i < info->numnote; i++)
+ sz += notesize(info->notes + i);
+
+ sz += info->thread_status_size;
+
+ return sz;
+}
+
+static int write_note_info(struct elf_note_info *info,
+ struct file *file, loff_t *foffset)
+{
+ int i;
+ struct list_head *t;
+
+ for (i = 0; i < info->numnote; i++)
+ if (!writenote(info->notes + i, file, foffset))
+ return 0;
+
+ /* write out the thread status notes section */
+ list_for_each(t, &info->thread_list) {
+ struct elf_thread_status *tmp =
+ list_entry(t, struct elf_thread_status, list);
+
+ for (i = 0; i < tmp->num_notes; i++)
+ if (!writenote(&tmp->notes[i], file, foffset))
+ return 0;
+ }
+
+ return 1;
+}
+
+static void free_note_info(struct elf_note_info *info)
+{
+ while (!list_empty(&info->thread_list)) {
+ struct list_head *tmp = info->thread_list.next;
+ list_del(tmp);
+ kfree(list_entry(tmp, struct elf_thread_status, list));
+ }
+
+ kfree(info->prstatus);
+ kfree(info->psinfo);
+ kfree(info->notes);
+ kfree(info->fpu);
+#ifdef ELF_CORE_COPY_XFPREGS
+ kfree(info->xfpu);
+#endif
+}
+
+#endif
+
static struct vm_area_struct *first_vma(struct task_struct *tsk,
struct vm_area_struct *gate_vma)
{
return gate_vma;
}
+static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
+ elf_addr_t e_shoff, int segs)
+{
+ elf->e_shoff = e_shoff;
+ elf->e_shentsize = sizeof(*shdr4extnum);
+ elf->e_shnum = 1;
+ elf->e_shstrndx = SHN_UNDEF;
+
+ memset(shdr4extnum, 0, sizeof(*shdr4extnum));
+
+ shdr4extnum->sh_type = SHT_NULL;
+ shdr4extnum->sh_size = elf->e_shnum;
+ shdr4extnum->sh_link = elf->e_shstrndx;
+ shdr4extnum->sh_info = segs;
+}
+
+static size_t elf_core_vma_data_size(struct vm_area_struct *gate_vma,
+ unsigned long mm_flags)
+{
+ struct vm_area_struct *vma;
+ size_t size = 0;
+
+ for (vma = first_vma(current, gate_vma); vma != NULL;
+ vma = next_vma(vma, gate_vma))
+ size += vma_dump_size(vma, mm_flags);
+ return size;
+}
+
/*
* Actual dumper
*
* and then they are actually written out. If we run out of core limit
* we just truncate.
*/
-static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
+static int elf_core_dump(struct coredump_params *cprm)
{
-#define NUM_NOTES 6
int has_dumped = 0;
mm_segment_t fs;
int segs;
size_t size = 0;
- int i;
struct vm_area_struct *vma, *gate_vma;
struct elfhdr *elf = NULL;
loff_t offset = 0, dataoff, foffset;
- int numnote;
- struct memelfnote *notes = NULL;
- struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
- struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
- struct task_struct *g, *p;
- LIST_HEAD(thread_list);
- struct list_head *t;
- elf_fpregset_t *fpu = NULL;
-#ifdef ELF_CORE_COPY_XFPREGS
- elf_fpxregset_t *xfpu = NULL;
-#endif
- int thread_status_size = 0;
- elf_addr_t *auxv;
- unsigned long mm_flags;
+ struct elf_note_info info;
+ struct elf_phdr *phdr4note = NULL;
+ struct elf_shdr *shdr4extnum = NULL;
+ Elf_Half e_phnum;
+ elf_addr_t e_shoff;
/*
* We no longer stop all VM operations.
/* alloc memory for large data structures: too large to be on stack */
elf = kmalloc(sizeof(*elf), GFP_KERNEL);
if (!elf)
- goto cleanup;
- prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL);
- if (!prstatus)
- goto cleanup;
- psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
- if (!psinfo)
- goto cleanup;
- notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
- if (!notes)
- goto cleanup;
- fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
- if (!fpu)
- goto cleanup;
-#ifdef ELF_CORE_COPY_XFPREGS
- xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
- if (!xfpu)
- goto cleanup;
-#endif
-
- if (signr) {
- struct elf_thread_status *tmp;
- rcu_read_lock();
- do_each_thread(g,p)
- if (current->mm == p->mm && current != p) {
- tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
- if (!tmp) {
- rcu_read_unlock();
- goto cleanup;
- }
- tmp->thread = p;
- list_add(&tmp->list, &thread_list);
- }
- while_each_thread(g,p);
- rcu_read_unlock();
- list_for_each(t, &thread_list) {
- struct elf_thread_status *tmp;
- int sz;
-
- tmp = list_entry(t, struct elf_thread_status, list);
- sz = elf_dump_thread_status(signr, tmp);
- thread_status_size += sz;
- }
- }
- /* now collect the dump for the current */
- memset(prstatus, 0, sizeof(*prstatus));
- fill_prstatus(prstatus, current, signr);
- elf_core_copy_regs(&prstatus->pr_reg, regs);
-
+ goto out;
+ /*
+ * The number of segs are recored into ELF header as 16bit value.
+ * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here.
+ */
segs = current->mm->map_count;
-#ifdef ELF_CORE_EXTRA_PHDRS
- segs += ELF_CORE_EXTRA_PHDRS;
-#endif
+ segs += elf_core_extra_phdrs();
- gate_vma = get_gate_vma(current);
+ gate_vma = get_gate_vma(current->mm);
if (gate_vma != NULL)
segs++;
- /* Set up header */
- fill_elf_header(elf, segs + 1); /* including notes section */
+ /* for notes section */
+ segs++;
- has_dumped = 1;
- current->flags |= PF_DUMPCORE;
+ /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
+ * this, kernel supports extended numbering. Have a look at
+ * include/linux/elf.h for further information. */
+ e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
/*
- * Set up the notes in similar form to SVR4 core dumps made
- * with info from their /proc.
+ * Collect all the non-memory information about the process for the
+ * notes. This also sets up the file header.
*/
+ if (!fill_note_info(elf, e_phnum, &info, cprm->signr, cprm->regs))
+ goto cleanup;
- fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
- fill_psinfo(psinfo, current->group_leader, current->mm);
- fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
-
- numnote = 2;
-
- auxv = (elf_addr_t *)current->mm->saved_auxv;
-
- i = 0;
- do
- i += 2;
- while (auxv[i - 2] != AT_NULL);
- fill_note(¬es[numnote++], "CORE", NT_AUXV,
- i * sizeof(elf_addr_t), auxv);
-
- /* Try to dump the FPU. */
- if ((prstatus->pr_fpvalid =
- elf_core_copy_task_fpregs(current, regs, fpu)))
- fill_note(notes + numnote++,
- "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
-#ifdef ELF_CORE_COPY_XFPREGS
- if (elf_core_copy_task_xfpregs(current, xfpu))
- fill_note(notes + numnote++,
- "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
-#endif
+ has_dumped = 1;
+ current->flags |= PF_DUMPCORE;
fs = get_fs();
set_fs(KERNEL_DS);
- DUMP_WRITE(elf, sizeof(*elf));
offset += sizeof(*elf); /* Elf header */
- offset += (segs + 1) * sizeof(struct elf_phdr); /* Program headers */
+ offset += segs * sizeof(struct elf_phdr); /* Program headers */
foffset = offset;
/* Write notes phdr entry */
{
- struct elf_phdr phdr;
- int sz = 0;
-
- for (i = 0; i < numnote; i++)
- sz += notesize(notes + i);
-
- sz += thread_status_size;
+ size_t sz = get_note_info_size(&info);
sz += elf_coredump_extra_notes_size();
- fill_elf_note_phdr(&phdr, sz, offset);
+ phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
+ if (!phdr4note)
+ goto end_coredump;
+
+ fill_elf_note_phdr(phdr4note, sz, offset);
offset += sz;
- DUMP_WRITE(&phdr, sizeof(phdr));
}
dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
- /*
- * We must use the same mm->flags while dumping core to avoid
- * inconsistency between the program headers and bodies, otherwise an
- * unusable core file can be generated.
- */
- mm_flags = current->mm->flags;
+ offset += elf_core_vma_data_size(gate_vma, cprm->mm_flags);
+ offset += elf_core_extra_data_size();
+ e_shoff = offset;
+
+ if (e_phnum == PN_XNUM) {
+ shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
+ if (!shdr4extnum)
+ goto end_coredump;
+ fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
+ }
+
+ offset = dataoff;
+
+ size += sizeof(*elf);
+ if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf)))
+ goto end_coredump;
+
+ size += sizeof(*phdr4note);
+ if (size > cprm->limit
+ || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note)))
+ goto end_coredump;
/* Write program headers for segments dump */
for (vma = first_vma(current, gate_vma); vma != NULL;
vma = next_vma(vma, gate_vma)) {
struct elf_phdr phdr;
- size_t sz;
-
- sz = vma->vm_end - vma->vm_start;
phdr.p_type = PT_LOAD;
phdr.p_offset = offset;
phdr.p_vaddr = vma->vm_start;
phdr.p_paddr = 0;
- phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0;
- phdr.p_memsz = sz;
+ phdr.p_filesz = vma_dump_size(vma, cprm->mm_flags);
+ phdr.p_memsz = vma->vm_end - vma->vm_start;
offset += phdr.p_filesz;
phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
if (vma->vm_flags & VM_WRITE)
phdr.p_flags |= PF_X;
phdr.p_align = ELF_EXEC_PAGESIZE;
- DUMP_WRITE(&phdr, sizeof(phdr));
+ size += sizeof(phdr);
+ if (size > cprm->limit
+ || !dump_write(cprm->file, &phdr, sizeof(phdr)))
+ goto end_coredump;
}
-#ifdef ELF_CORE_WRITE_EXTRA_PHDRS
- ELF_CORE_WRITE_EXTRA_PHDRS;
-#endif
+ if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit))
+ goto end_coredump;
/* write out the notes section */
- for (i = 0; i < numnote; i++)
- if (!writenote(notes + i, file, &foffset))
- goto end_coredump;
-
- if (elf_coredump_extra_notes_write(file, &foffset))
+ if (!write_note_info(&info, cprm->file, &foffset))
goto end_coredump;
- /* write out the thread status notes section */
- list_for_each(t, &thread_list) {
- struct elf_thread_status *tmp =
- list_entry(t, struct elf_thread_status, list);
-
- for (i = 0; i < tmp->num_notes; i++)
- if (!writenote(&tmp->notes[i], file, &foffset))
- goto end_coredump;
- }
+ if (elf_coredump_extra_notes_write(cprm->file, &foffset))
+ goto end_coredump;
/* Align to page */
- DUMP_SEEK(dataoff - foffset);
+ if (!dump_seek(cprm->file, dataoff - foffset))
+ goto end_coredump;
for (vma = first_vma(current, gate_vma); vma != NULL;
vma = next_vma(vma, gate_vma)) {
unsigned long addr;
+ unsigned long end;
- if (!maydump(vma, mm_flags))
- continue;
+ end = vma->vm_start + vma_dump_size(vma, cprm->mm_flags);
- for (addr = vma->vm_start;
- addr < vma->vm_end;
- addr += PAGE_SIZE) {
+ for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
struct page *page;
- struct vm_area_struct *vma;
-
- if (get_user_pages(current, current->mm, addr, 1, 0, 1,
- &page, &vma) <= 0) {
- DUMP_SEEK(PAGE_SIZE);
- } else {
- if (page == ZERO_PAGE(0)) {
- if (!dump_seek(file, PAGE_SIZE)) {
- page_cache_release(page);
- goto end_coredump;
- }
- } else {
- void *kaddr;
- flush_cache_page(vma, addr,
- page_to_pfn(page));
- kaddr = kmap(page);
- if ((size += PAGE_SIZE) > limit ||
- !dump_write(file, kaddr,
- PAGE_SIZE)) {
- kunmap(page);
- page_cache_release(page);
- goto end_coredump;
- }
- kunmap(page);
- }
+ int stop;
+
+ page = get_dump_page(addr);
+ if (page) {
+ void *kaddr = kmap(page);
+ stop = ((size += PAGE_SIZE) > cprm->limit) ||
+ !dump_write(cprm->file, kaddr,
+ PAGE_SIZE);
+ kunmap(page);
page_cache_release(page);
- }
+ } else
+ stop = !dump_seek(cprm->file, PAGE_SIZE);
+ if (stop)
+ goto end_coredump;
}
}
-#ifdef ELF_CORE_WRITE_EXTRA_DATA
- ELF_CORE_WRITE_EXTRA_DATA;
-#endif
+ if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit))
+ goto end_coredump;
+
+ if (e_phnum == PN_XNUM) {
+ size += sizeof(*shdr4extnum);
+ if (size > cprm->limit
+ || !dump_write(cprm->file, shdr4extnum,
+ sizeof(*shdr4extnum)))
+ goto end_coredump;
+ }
end_coredump:
set_fs(fs);
cleanup:
- while (!list_empty(&thread_list)) {
- struct list_head *tmp = thread_list.next;
- list_del(tmp);
- kfree(list_entry(tmp, struct elf_thread_status, list));
- }
-
+ free_note_info(&info);
+ kfree(shdr4extnum);
+ kfree(phdr4note);
kfree(elf);
- kfree(prstatus);
- kfree(psinfo);
- kfree(notes);
- kfree(fpu);
-#ifdef ELF_CORE_COPY_XFPREGS
- kfree(xfpu);
-#endif
+out:
return has_dumped;
-#undef NUM_NOTES
}
-#endif /* USE_ELF_CORE_DUMP */
+#endif /* CONFIG_ELF_CORE */
static int __init init_elf_binfmt(void)
{
Code Review / linux-2.6.git / blobdiff