commit 88a8637cb4658cd91a002659db05867716b88b36

Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>

Date:   Wed Apr 27 13:40:30 2022 -0300

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

    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.

    (cherry picked from commit 118a2aee07f64d605b6668cbe195c1f44eac6be6)

diff --git a/io/Makefile b/io/Makefile

index 9871ecbc74020a6d..01968b81042e01e4 100644

--- a/io/Makefile

+++ b/io/Makefile

@@ -81,16 +81,17 @@ tests		:= test-utime test-stat test-stat2 test-lfs tst-getcwd \

 		   tst-closefrom \

 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.

@@ -134,6 +135,7 @@ 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

diff --git a/io/tst-lchmod-time64.c b/io/tst-lchmod-time64.c

new file mode 100644

index 0000000000000000..f2b7cc9d358f2a77

--- /dev/null

+++ b/io/tst-lchmod-time64.c

@@ -0,0 +1,2 @@

+#define CHECK_TIME64

+#include "tst-lchmod.c"

diff --git a/io/tst-lchmod.c b/io/tst-lchmod.c

index 0fe98e01b74b713d..472766b186975922 100644

--- a/io/tst-lchmod.c

+++ b/io/tst-lchmod.c

@@ -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);

diff --git a/sysdeps/unix/sysv/linux/fchmodat.c b/sysdeps/unix/sysv/linux/fchmodat.c

index 5bd1eb96a5d78130..b0cf61949a9302d9 100644

--- a/sysdeps/unix/sysv/linux/fchmodat.c

+++ b/sysdeps/unix/sysv/linux/fchmodat.c

@@ -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;