git/compat/access.c
Clément Chigot 400caafb2b git-compat-util: work around for access(X_OK) under root
On AIX, access(X_OK) may succeed when run as root even if the
execution isn't possible. This behavior is allowed by POSIX
which says:

  ... for a process with appropriate privileges, an implementation
  may indicate success for X_OK even if execute permission is not
  granted to any user.

It can lead hook programs to have their execution refused:

   git commit -m content
   fatal: cannot exec '.git/hooks/pre-commit': Permission denied

Add NEED_ACCESS_ROOT_HANDLER in order to use an access helper function.
It checks with stat if any executable flags is set when the current user
is root.

Signed-off-by: Clément Chigot <clement.chigot@atos.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-04-25 17:49:44 +09:00

32 lines
669 B
C

#define COMPAT_CODE_ACCESS
#include "../git-compat-util.h"
/* Do the same thing access(2) does, but use the effective uid,
* and don't make the mistake of telling root that any file is
* executable. This version uses stat(2).
*/
int git_access(const char *path, int mode)
{
struct stat st;
/* do not interfere a normal user */
if (geteuid())
return access(path, mode);
if (stat(path, &st) < 0)
return -1;
/* Root can read or write any file. */
if (!(mode & X_OK))
return 0;
/* Root can execute any file that has any one of the execute
* bits set.
*/
if (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
return 0;
errno = EACCES;
return -1;
}