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stdlib: Sync canonicalize with gnulib [BZ #10635] [BZ #26592] [BZ #26341] [BZ #24970]

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It sync with gnulib version ae9fb3d66.  The testcase for BZ#23741
(stdlib/test-bz22786.c) is adjusted to check also for ENOMEM.

The patch fixes multiple realpath issues:

  - Portability fixes for errno clobbering on free (BZ#10635).  The
    function does not call free directly anymore, although it might be
    done through scratch_buffer_free.  The free errno clobbering is
    being tracked by BZ#17924.

  - Pointer arithmetic overflows in realpath (BZ#26592).

  - Realpath cyclically call __alloca(path_max) to consume too much
    stack space (BZ#26341).

  - Realpath mishandles EOVERFLOW; stat not needed anyway (BZ#24970).
    The check is done through faccessat now.

Checked on x86_64-linux-gnu and i686-linux-gnu.
This commit is contained in:
Adhemerval Zanella
2020-12-29 11:37:34 -03:00
parent 448a256359
commit c6e0b0b5b0
3 changed files with 379 additions and 161 deletions
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3
sysdeps/unix/sysv/linux/faccessat.c
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@@ -24,7 +24,7 @@
int
faccessat (int fd, const char *file, int mode, int flag)
__faccessat (int fd, const char *file, int mode, int flag)
{
int ret = INLINE_SYSCALL_CALL (faccessat2, fd, file, mode, flag);
#if __ASSUME_FACCESSAT2
@@ -73,3 +73,4 @@ faccessat (int fd, const char *file, int mode, int flag)
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EACCES);
#endif /* !__ASSUME_FACCESSAT2 */
}
weak_alias (__faccessat, faccessat)