usermodehelper: check subprocess_info->path != NULL
[linux-2.6.git] / kernel / uid16.c
index dd308ba..51c6e89 100644 (file)
@@ -4,7 +4,6 @@
  */
 
 #include <linux/mm.h>
-#include <linux/utsname.h>
 #include <linux/mman.h>
 #include <linux/notifier.h>
 #include <linux/reboot.h>
 
 #include <asm/uaccess.h>
 
-asmlinkage long sys_chown16(const char __user * filename, old_uid_t user, old_gid_t group)
+SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
 {
        long ret = sys_chown(filename, low2highuid(user), low2highgid(group));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(3, ret, filename, user, group);
        return ret;
 }
 
-asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group)
+SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
 {
        long ret = sys_lchown(filename, low2highuid(user), low2highgid(group));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(3, ret, filename, user, group);
        return ret;
 }
 
-asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group)
+SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
 {
        long ret = sys_fchown(fd, low2highuid(user), low2highgid(group));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(3, ret, fd, user, group);
        return ret;
 }
 
-asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
+SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
 {
        long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(2, ret, rgid, egid);
        return ret;
 }
 
-asmlinkage long sys_setgid16(old_gid_t gid)
+SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
 {
        long ret = sys_setgid(low2highgid(gid));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(1, ret, gid);
        return ret;
 }
 
-asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
+SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
 {
        long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(2, ret, ruid, euid);
        return ret;
 }
 
-asmlinkage long sys_setuid16(old_uid_t uid)
+SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
 {
        long ret = sys_setuid(low2highuid(uid));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(1, ret, uid);
        return ret;
 }
 
-asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
+SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
 {
        long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid),
                                 low2highuid(suid));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(3, ret, ruid, euid, suid);
        return ret;
 }
 
-asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
+SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruid, old_uid_t __user *, euid, old_uid_t __user *, suid)
 {
+       const struct cred *cred = current_cred();
        int retval;
 
-       if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
-           !(retval = put_user(high2lowuid(current->euid), euid)))
-               retval = put_user(high2lowuid(current->suid), suid);
+       if (!(retval   = put_user(high2lowuid(cred->uid),  ruid)) &&
+           !(retval   = put_user(high2lowuid(cred->euid), euid)))
+               retval = put_user(high2lowuid(cred->suid), suid);
 
        return retval;
 }
 
-asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
+SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
 {
        long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid),
                                 low2highgid(sgid));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(3, ret, rgid, egid, sgid);
        return ret;
 }
 
-asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
+
+SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgid, old_gid_t __user *, egid, old_gid_t __user *, sgid)
 {
+       const struct cred *cred = current_cred();
        int retval;
 
-       if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
-           !(retval = put_user(high2lowgid(current->egid), egid)))
-               retval = put_user(high2lowgid(current->sgid), sgid);
+       if (!(retval   = put_user(high2lowgid(cred->gid),  rgid)) &&
+           !(retval   = put_user(high2lowgid(cred->egid), egid)))
+               retval = put_user(high2lowgid(cred->sgid), sgid);
 
        return retval;
 }
 
-asmlinkage long sys_setfsuid16(old_uid_t uid)
+SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
 {
        long ret = sys_setfsuid(low2highuid(uid));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(1, ret, uid);
        return ret;
 }
 
-asmlinkage long sys_setfsgid16(old_gid_t gid)
+SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
 {
        long ret = sys_setfsgid(low2highgid(gid));
        /* avoid REGPARM breakage on x86: */
-       prevent_tail_call(ret);
+       asmlinkage_protect(1, ret, gid);
        return ret;
 }
 
@@ -159,36 +161,35 @@ static int groups16_from_user(struct group_info *group_info,
        return 0;
 }
 
-asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
+SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
 {
-       int i = 0;
+       const struct cred *cred = current_cred();
+       int i;
 
        if (gidsetsize < 0)
                return -EINVAL;
 
-       get_group_info(current->group_info);
-       i = current->group_info->ngroups;
+       i = cred->group_info->ngroups;
        if (gidsetsize) {
                if (i > gidsetsize) {
                        i = -EINVAL;
                        goto out;
                }
-               if (groups16_to_user(grouplist, current->group_info)) {
+               if (groups16_to_user(grouplist, cred->group_info)) {
                        i = -EFAULT;
                        goto out;
                }
        }
 out:
-       put_group_info(current->group_info);
        return i;
 }
 
-asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
+SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
 {
        struct group_info *group_info;
        int retval;
 
-       if (!capable(CAP_SETGID))
+       if (!nsown_capable(CAP_SETGID))
                return -EPERM;
        if ((unsigned)gidsetsize > NGROUPS_MAX)
                return -EINVAL;
@@ -208,22 +209,22 @@ asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
        return retval;
 }
 
-asmlinkage long sys_getuid16(void)
+SYSCALL_DEFINE0(getuid16)
 {
-       return high2lowuid(current->uid);
+       return high2lowuid(current_uid());
 }
 
-asmlinkage long sys_geteuid16(void)
+SYSCALL_DEFINE0(geteuid16)
 {
-       return high2lowuid(current->euid);
+       return high2lowuid(current_euid());
 }
 
-asmlinkage long sys_getgid16(void)
+SYSCALL_DEFINE0(getgid16)
 {
-       return high2lowgid(current->gid);
+       return high2lowgid(current_gid());
 }
 
-asmlinkage long sys_getegid16(void)
+SYSCALL_DEFINE0(getegid16)
 {
-       return high2lowgid(current->egid);
+       return high2lowgid(current_egid());
 }