audit: inline audit_syscall_entry to reduce burden on archs
Eric Paris [Tue, 3 Jan 2012 19:23:06 +0000 (14:23 -0500)]
Every arch calls:

if (unlikely(current->audit_context))
audit_syscall_entry()

which requires knowledge about audit (the existance of audit_context) in
the arch code.  Just do it all in static inline in audit.h so that arch's
can remain blissfully ignorant.

Signed-off-by: Eric Paris <eparis@redhat.com>

16 files changed:
arch/ia64/kernel/ptrace.c
arch/microblaze/kernel/ptrace.c
arch/mips/kernel/ptrace.c
arch/powerpc/kernel/ptrace.c
arch/s390/kernel/ptrace.c
arch/sh/kernel/ptrace_32.c
arch/sh/kernel/ptrace_64.c
arch/sparc/kernel/ptrace_64.c
arch/um/kernel/ptrace.c
arch/x86/ia32/ia32entry.S
arch/x86/kernel/entry_32.S
arch/x86/kernel/entry_64.S
arch/x86/kernel/ptrace.c
arch/xtensa/kernel/ptrace.c
include/linux/audit.h
kernel/auditsc.c

index 2c15408..dad9166 100644 (file)
@@ -1246,15 +1246,8 @@ syscall_trace_enter (long arg0, long arg1, long arg2, long arg3,
        if (test_thread_flag(TIF_RESTORE_RSE))
                ia64_sync_krbs();
 
-       if (unlikely(current->audit_context)) {
-               long syscall;
-               int arch;
 
-               syscall = regs.r15;
-               arch = AUDIT_ARCH_IA64;
-
-               audit_syscall_entry(arch, syscall, arg0, arg1, arg2, arg3);
-       }
+       audit_syscall_entry(AUDIT_ARCH_IA64, regs.r15, arg0, arg1, arg2, arg3);
 
        return 0;
 }
index f564b1b..6eb2aa9 100644 (file)
@@ -147,10 +147,8 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
                 */
                ret = -1L;
 
-       if (unlikely(current->audit_context))
-               audit_syscall_entry(EM_MICROBLAZE, regs->r12,
-                                   regs->r5, regs->r6,
-                                   regs->r7, regs->r8);
+       audit_syscall_entry(EM_MICROBLAZE, regs->r12, regs->r5, regs->r6,
+                           regs->r7, regs->r8);
 
        return ret ?: regs->r12;
 }
index ab0f196..7786b60 100644 (file)
@@ -560,10 +560,9 @@ asmlinkage void syscall_trace_enter(struct pt_regs *regs)
        }
 
 out:
-       if (unlikely(current->audit_context))
-               audit_syscall_entry(audit_arch(), regs->regs[2],
-                                   regs->regs[4], regs->regs[5],
-                                   regs->regs[6], regs->regs[7]);
+       audit_syscall_entry(audit_arch(), regs->regs[2],
+                           regs->regs[4], regs->regs[5],
+                           regs->regs[6], regs->regs[7]);
 }
 
 /*
index 09d31c1..5b43325 100644 (file)
@@ -1724,22 +1724,20 @@ long do_syscall_trace_enter(struct pt_regs *regs)
        if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
                trace_sys_enter(regs, regs->gpr[0]);
 
-       if (unlikely(current->audit_context)) {
 #ifdef CONFIG_PPC64
-               if (!is_32bit_task())
-                       audit_syscall_entry(AUDIT_ARCH_PPC64,
-                                           regs->gpr[0],
-                                           regs->gpr[3], regs->gpr[4],
-                                           regs->gpr[5], regs->gpr[6]);
-               else
+       if (!is_32bit_task())
+               audit_syscall_entry(AUDIT_ARCH_PPC64,
+                                   regs->gpr[0],
+                                   regs->gpr[3], regs->gpr[4],
+                                   regs->gpr[5], regs->gpr[6]);
+       else
 #endif
-                       audit_syscall_entry(AUDIT_ARCH_PPC,
-                                           regs->gpr[0],
-                                           regs->gpr[3] & 0xffffffff,
-                                           regs->gpr[4] & 0xffffffff,
-                                           regs->gpr[5] & 0xffffffff,
-                                           regs->gpr[6] & 0xffffffff);
-       }
+               audit_syscall_entry(AUDIT_ARCH_PPC,
+                                   regs->gpr[0],
+                                   regs->gpr[3] & 0xffffffff,
+                                   regs->gpr[4] & 0xffffffff,
+                                   regs->gpr[5] & 0xffffffff,
+                                   regs->gpr[6] & 0xffffffff);
 
        return ret ?: regs->gpr[0];
 }
index f527586..9d82ed4 100644 (file)
@@ -740,12 +740,11 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
        if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
                trace_sys_enter(regs, regs->gprs[2]);
 
-       if (unlikely(current->audit_context))
-               audit_syscall_entry(is_compat_task() ?
-                                       AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
-                                   regs->gprs[2], regs->orig_gpr2,
-                                   regs->gprs[3], regs->gprs[4],
-                                   regs->gprs[5]);
+       audit_syscall_entry(is_compat_task() ?
+                               AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
+                           regs->gprs[2], regs->orig_gpr2,
+                           regs->gprs[3], regs->gprs[4],
+                           regs->gprs[5]);
        return ret ?: regs->gprs[2];
 }
 
index c0b5c17..a3e6515 100644 (file)
@@ -518,10 +518,9 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
        if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
                trace_sys_enter(regs, regs->regs[0]);
 
-       if (unlikely(current->audit_context))
-               audit_syscall_entry(audit_arch(), regs->regs[3],
-                                   regs->regs[4], regs->regs[5],
-                                   regs->regs[6], regs->regs[7]);
+       audit_syscall_entry(audit_arch(), regs->regs[3],
+                           regs->regs[4], regs->regs[5],
+                           regs->regs[6], regs->regs[7]);
 
        return ret ?: regs->regs[0];
 }
index ba720d6..3d0080b 100644 (file)
@@ -536,10 +536,9 @@ asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
        if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
                trace_sys_enter(regs, regs->regs[9]);
 
-       if (unlikely(current->audit_context))
-               audit_syscall_entry(audit_arch(), regs->regs[1],
-                                   regs->regs[2], regs->regs[3],
-                                   regs->regs[4], regs->regs[5]);
+       audit_syscall_entry(audit_arch(), regs->regs[1],
+                           regs->regs[2], regs->regs[3],
+                           regs->regs[4], regs->regs[5]);
 
        return ret ?: regs->regs[9];
 }
index c73c8c5..9388844 100644 (file)
@@ -1071,15 +1071,14 @@ asmlinkage int syscall_trace_enter(struct pt_regs *regs)
        if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
                trace_sys_enter(regs, regs->u_regs[UREG_G1]);
 
-       if (unlikely(current->audit_context) && !ret)
-               audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
-                                    AUDIT_ARCH_SPARC :
-                                    AUDIT_ARCH_SPARC64),
-                                   regs->u_regs[UREG_G1],
-                                   regs->u_regs[UREG_I0],
-                                   regs->u_regs[UREG_I1],
-                                   regs->u_regs[UREG_I2],
-                                   regs->u_regs[UREG_I3]);
+       audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
+                            AUDIT_ARCH_SPARC :
+                            AUDIT_ARCH_SPARC64),
+                           regs->u_regs[UREG_G1],
+                           regs->u_regs[UREG_I0],
+                           regs->u_regs[UREG_I1],
+                           regs->u_regs[UREG_I2],
+                           regs->u_regs[UREG_I3]);
 
        return ret;
 }
index 2ccf25c..06b1903 100644 (file)
@@ -167,17 +167,15 @@ void syscall_trace(struct uml_pt_regs *regs, int entryexit)
        int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit;
        int tracesysgood;
 
-       if (unlikely(current->audit_context)) {
-               if (!entryexit)
-                       audit_syscall_entry(HOST_AUDIT_ARCH,
-                                           UPT_SYSCALL_NR(regs),
-                                           UPT_SYSCALL_ARG1(regs),
-                                           UPT_SYSCALL_ARG2(regs),
-                                           UPT_SYSCALL_ARG3(regs),
-                                           UPT_SYSCALL_ARG4(regs));
-               else
-                       audit_syscall_exit(regs);
-       }
+       if (!entryexit)
+               audit_syscall_entry(HOST_AUDIT_ARCH,
+                                   UPT_SYSCALL_NR(regs),
+                                   UPT_SYSCALL_ARG1(regs),
+                                   UPT_SYSCALL_ARG2(regs),
+                                   UPT_SYSCALL_ARG3(regs),
+                                   UPT_SYSCALL_ARG4(regs));
+       else
+               audit_syscall_exit(regs);
 
        /* Fake a debug trap */
        if (is_singlestep)
index 025f0f0..cecfd9a 100644 (file)
@@ -192,7 +192,7 @@ sysexit_from_sys_call:
        movl %ebx,%edx                  /* 3rd arg: 1st syscall arg */
        movl %eax,%esi                  /* 2nd arg: syscall number */
        movl $AUDIT_ARCH_I386,%edi      /* 1st arg: audit arch */
-       call audit_syscall_entry
+       call __audit_syscall_entry
        movl RAX-ARGOFFSET(%rsp),%eax   /* reload syscall number */
        cmpq $(IA32_NR_syscalls-1),%rax
        ja ia32_badsys
index a22facf..1ccd742 100644 (file)
@@ -456,7 +456,7 @@ sysenter_audit:
        movl %ebx,%ecx                  /* 3rd arg: 1st syscall arg */
        movl %eax,%edx                  /* 2nd arg: syscall number */
        movl $AUDIT_ARCH_I386,%eax      /* 1st arg: audit arch */
-       call audit_syscall_entry
+       call __audit_syscall_entry
        pushl_cfi %ebx
        movl PT_EAX(%esp),%eax          /* reload syscall number */
        jmp sysenter_do_call
index e51393d..1ca66b6 100644 (file)
@@ -549,7 +549,7 @@ badsys:
 #ifdef CONFIG_AUDITSYSCALL
        /*
         * Fast path for syscall audit without full syscall trace.
-        * We just call audit_syscall_entry() directly, and then
+        * We just call __audit_syscall_entry() directly, and then
         * jump back to the normal fast path.
         */
 auditsys:
@@ -559,7 +559,7 @@ auditsys:
        movq %rdi,%rdx                  /* 3rd arg: 1st syscall arg */
        movq %rax,%rsi                  /* 2nd arg: syscall number */
        movl $AUDIT_ARCH_X86_64,%edi    /* 1st arg: audit arch */
-       call audit_syscall_entry
+       call __audit_syscall_entry
        LOAD_ARGS 0             /* reload call-clobbered registers */
        jmp system_call_fastpath
 
index 8b02187..5026738 100644 (file)
@@ -1392,20 +1392,18 @@ long syscall_trace_enter(struct pt_regs *regs)
        if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
                trace_sys_enter(regs, regs->orig_ax);
 
-       if (unlikely(current->audit_context)) {
-               if (IS_IA32)
-                       audit_syscall_entry(AUDIT_ARCH_I386,
-                                           regs->orig_ax,
-                                           regs->bx, regs->cx,
-                                           regs->dx, regs->si);
+       if (IS_IA32)
+               audit_syscall_entry(AUDIT_ARCH_I386,
+                                   regs->orig_ax,
+                                   regs->bx, regs->cx,
+                                   regs->dx, regs->si);
 #ifdef CONFIG_X86_64
-               else
-                       audit_syscall_entry(AUDIT_ARCH_X86_64,
-                                           regs->orig_ax,
-                                           regs->di, regs->si,
-                                           regs->dx, regs->r10);
+       else
+               audit_syscall_entry(AUDIT_ARCH_X86_64,
+                                   regs->orig_ax,
+                                   regs->di, regs->si,
+                                   regs->dx, regs->r10);
 #endif
-       }
 
        return ret ?: regs->orig_ax;
 }
index a0d042a..2dff698 100644 (file)
@@ -334,8 +334,7 @@ void do_syscall_trace_enter(struct pt_regs *regs)
                do_syscall_trace();
 
 #if 0
-       if (unlikely(current->audit_context))
-               audit_syscall_entry(current, AUDIT_ARCH_XTENSA..);
+       audit_syscall_entry(current, AUDIT_ARCH_XTENSA..);
 #endif
 }
 
index 3d65e4b..f56ce26 100644 (file)
@@ -418,9 +418,9 @@ extern int audit_classify_arch(int arch);
 extern void audit_finish_fork(struct task_struct *child);
 extern int  audit_alloc(struct task_struct *task);
 extern void audit_free(struct task_struct *task);
-extern void audit_syscall_entry(int arch,
-                               int major, unsigned long a0, unsigned long a1,
-                               unsigned long a2, unsigned long a3);
+extern void __audit_syscall_entry(int arch,
+                                 int major, unsigned long a0, unsigned long a1,
+                                 unsigned long a2, unsigned long a3);
 extern void __audit_syscall_exit(int ret_success, long ret_value);
 extern void __audit_getname(const char *name);
 extern void audit_putname(const char *name);
@@ -435,6 +435,13 @@ static inline int audit_dummy_context(void)
        void *p = current->audit_context;
        return !p || *(int *)p;
 }
+static inline void audit_syscall_entry(int arch, int major, unsigned long a0,
+                                      unsigned long a1, unsigned long a2,
+                                      unsigned long a3)
+{
+       if (unlikely(!audit_dummy_context()))
+               __audit_syscall_entry(arch, major, a0, a1, a2, a3);
+}
 static inline void audit_syscall_exit(void *pt_regs)
 {
        if (unlikely(current->audit_context)) {
index 3d28538..b408100 100644 (file)
@@ -1632,7 +1632,7 @@ void audit_free(struct task_struct *tsk)
  * will only be written if another part of the kernel requests that it
  * be written).
  */
-void audit_syscall_entry(int arch, int major,
+void __audit_syscall_entry(int arch, int major,
                         unsigned long a1, unsigned long a2,
                         unsigned long a3, unsigned long a4)
 {