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linux: Fix fchmodat with AT_SYMLINK_NOFOLLOW for 64 bit time_t (BZ#29097)

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The AT_SYMLINK_NOFOLLOW emulation ues the default 32 bit stat internal
calls, which fails with EOVERFLOW if the file constains timestamps
beyond 2038.

Checked on i686-linux-gnu.
This commit is contained in:
Adhemerval Zanella 2022-04-27 13:40:30 -03:00
parent 6f043e0ee7
commit 118a2aee07
4 changed files with 30 additions and 6 deletions
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8
io/Makefile
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@ -83,16 +83,17 @@ tests := test-utime test-stat test-stat2 test-lfs tst-getcwd \
tst-ftw-bz28126
tests-time64 := \
tst-fcntl-time64 \
tst-fts-time64 \
tst-futimens-time64 \
tst-futimes-time64\
tst-fts-time64 \
tst-futimesat-time64 \
tst-lchmod-time64 \
tst-lutimes-time64 \
tst-stat-time64 \
tst-futimesat-time64 \
tst-utime-time64 \
tst-utimensat-time64 \
tst-utimes-time64 \
tst-fcntl-time64 \
# tests-time64
# Likewise for statx, but we do not need static linking here.
@ -136,6 +137,7 @@ CFLAGS-close.c += -fexceptions -fasynchronous-unwind-tables
CFLAGS-test-stat.c += -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE
CFLAGS-test-lfs.c += -D_LARGEFILE64_SOURCE
CFLAGS-tst-lchmod.c += -D_FILE_OFFSET_BITS=64
test-stat2-ARGS = Makefile . $(objpfx)test-stat2

2
io/tst-lchmod-time64.c Normal file
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@ -0,0 +1,2 @@
#define CHECK_TIME64
#include "tst-lchmod.c"

22
io/tst-lchmod.c
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@ -66,10 +66,27 @@ select_path (bool do_relative_path, const char *full_path, const char *relative_
return full_path;
}
static void
update_file_time_to_y2038 (const char *fname, int flags)
{
#ifdef CHECK_TIME64
/* Y2038 threshold plus 1 second. */
const struct timespec ts[] = { { 0x80000001LL, 0}, { 0x80000001LL } };
TEST_VERIFY_EXIT (utimensat (AT_FDCWD, fname, ts, flags) == 0);
#endif
}
static void
test_1 (bool do_relative_path, int (*chmod_func) (int fd, const char *, mode_t, int))
{
char *tempdir = support_create_temp_directory ("tst-lchmod-");
#ifdef CHECK_TIME64
if (!support_path_support_time64 (tempdir))
{
puts ("info: test skipped, filesystem does not support 64 bit time_t");
return;
}
#endif
char *path_dangling = xasprintf ("%s/dangling", tempdir);
char *path_file = xasprintf ("%s/file", tempdir);
@ -93,9 +110,12 @@ test_1 (bool do_relative_path, int (*chmod_func) (int fd, const char *, mode_t,
xsymlink ("loop", path_loop);
xsymlink ("target-does-not-exist", path_dangling);
update_file_time_to_y2038 (path_file, 0);
update_file_time_to_y2038 (path_to_file, AT_SYMLINK_NOFOLLOW);
/* Check that the modes do not collide with what we will use in the
test. */
struct stat64 st;
struct stat st;
xstat (path_file, &st);
TEST_VERIFY ((st.st_mode & 0777) != 1);
xlstat (path_to_file, &st);

4
sysdeps/unix/sysv/linux/fchmodat.c
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@ -48,8 +48,8 @@ fchmodat (int fd, const char *file, mode_t mode, int flag)
/* Use fstatat because fstat does not work on O_PATH descriptors
before Linux 3.6. */
struct stat64 st;
if (__fstatat64 (pathfd, "", &st, AT_EMPTY_PATH) != 0)
struct __stat64_t64 st;
if (__fstatat64_time64 (pathfd, "", &st, AT_EMPTY_PATH) != 0)
{
__close_nocancel (pathfd);
return -1;