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From 88a8637cb4658cd91a002659db05867716b88b36 Mon Sep 17 00:00:00 2001
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed, 27 Apr 2022 13:40:30 -0300
Subject: [PATCH] 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)
---
NEWS | 2 ++
io/Makefile | 8 +++++---
io/tst-lchmod-time64.c | 2 ++
io/tst-lchmod.c | 22 +++++++++++++++++++++-
sysdeps/unix/sysv/linux/fchmodat.c | 4 ++--
5 files changed, 32 insertions(+), 6 deletions(-)
create mode 100644 io/tst-lchmod-time64.c
diff --git a/NEWS b/NEWS
index 4965818..b444478 100644
--- a/NEWS
+++ b/NEWS
@@ -39,6 +39,8 @@ The following bugs are resolved with this release:
without /sys and /proc
[29029] nptl: poll() spuriously returns EINTR during thread
cancellation and with cancellation disabled
+ [29097] time: fchmodat does not handle 64 bit time_t for
+ AT_SYMLINK_NOFOLLOW
Version 2.34
diff --git a/io/Makefile b/io/Makefile
index 9871ecb..01968b8 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -82,16 +82,17 @@ 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.
@@ -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 0000000..f2b7cc9
--- /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 0fe98e0..472766b 100644
--- a/io/tst-lchmod.c
+++ b/io/tst-lchmod.c
@@ -67,9 +67,26 @@ select_path (bool do_relative_path, const char *full_path, const char *relative_
}
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 5bd1eb9..b0cf619 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;
--
1.8.3.1
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