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* [glibc] linux: Use INTERNAL_SYSCALL on fstatat{64}
@ 2020-10-16 17:22 Adhemerval Zanella
0 siblings, 0 replies; only message in thread
From: Adhemerval Zanella @ 2020-10-16 17:22 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cb49c65bb5581b5ca6122898716aad1f075982d8
commit cb49c65bb5581b5ca6122898716aad1f075982d8
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Wed Oct 14 14:31:38 2020 -0300
linux: Use INTERNAL_SYSCALL on fstatat{64}
Although not required by the standards, some code expects that a
successful stat call should not set errno. However since aa03f722f3b99
'linux: Add {f}stat{at} y2038 support', on 32-bit systems with 32-bit
time_t supporrt, stat implementation will first issues __NR_statx and
if it fails with ENOSYS issue the system stat syscall.
On architecture running on kernel without __NR_statx support the
first call will set the errno to ENOSYS, even when the following stat
syscall might not fail.
This patch fixes by using INTERNAL_SYSCALL and only setting the errno
value when function returns.
Checked on i686-linux-gnu, x86_64-linux-gnu, sparc64-linux-gnu,
sparcv9-linux-gnu, powerpc64-linux-gnu, powerpc64le-linux-gnu,
arm-linux-gnueabihf, and aarch64-linux-gnu.
Diff:
---
sysdeps/unix/sysv/linux/fstatat.c | 19 ++++++++++-----
sysdeps/unix/sysv/linux/fstatat64.c | 31 +++++++++++++-----------
sysdeps/unix/sysv/linux/mips/mips64/kstat_cp.h | 8 +++---
sysdeps/unix/sysv/linux/sparc/sparc64/kstat_cp.h | 4 +--
4 files changed, 34 insertions(+), 28 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/fstatat.c b/sysdeps/unix/sysv/linux/fstatat.c
index c7fcfaf277..db49e3155c 100644
--- a/sysdeps/unix/sysv/linux/fstatat.c
+++ b/sysdeps/unix/sysv/linux/fstatat.c
@@ -26,21 +26,22 @@
int
__fstatat (int fd, const char *file, struct stat *buf, int flag)
{
+ int r;
+
# if STAT_IS_KERNEL_STAT
/* New kABIs which uses generic pre 64-bit time Linux ABI, e.g.
csky, nios2 */
- int r = INLINE_SYSCALL_CALL (fstatat64, fd, file, buf, flag);
+ r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, buf, flag);
if (r == 0 && (buf->__st_ino_pad != 0
|| buf->__st_size_pad != 0
|| buf->__st_blocks_pad != 0))
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
- return r;
# else
# ifdef __NR_fstatat64
/* Old KABIs with old non-LFS support, e.g. arm, i386, hppa, m68k, mips32,
microblaze, s390, sh, powerpc, and sparc. */
struct stat64 st64;
- int r = INLINE_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
+ r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
if (r == 0)
{
if (! in_ino_t_range (st64.st_ino)
@@ -67,15 +68,21 @@ __fstatat (int fd, const char *file, struct stat *buf, int flag)
buf->st_mtim.tv_nsec = st64.st_mtim.tv_nsec;
buf->st_ctim.tv_sec = st64.st_ctim.tv_sec;
buf->st_ctim.tv_nsec = st64.st_ctim.tv_nsec;
+
+ return 0;
}
- return r;
# else
/* 64-bit kabi outlier, e.g. mips64 and mips64-n32. */
struct kernel_stat kst;
- int r = INLINE_SYSCALL_CALL (newfstatat, fd, file, &kst, flag);
- return r ?: __cp_kstat_stat (&kst, buf);
+ r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, &kst, flag);
+ if (r == 0)
+ r = __cp_kstat_stat (&kst, buf);
# endif /* __nr_fstatat64 */
# endif /* STAT_IS_KERNEL_STAT */
+
+ return INTERNAL_SYSCALL_ERROR_P (r)
+ ? INLINE_SYSCALL_ERROR_RETURN_VALUE (-r)
+ : 0;
}
weak_alias (__fstatat, fstatat)
diff --git a/sysdeps/unix/sysv/linux/fstatat64.c b/sysdeps/unix/sysv/linux/fstatat64.c
index ae8fc101c5..44347603b4 100644
--- a/sysdeps/unix/sysv/linux/fstatat64.c
+++ b/sysdeps/unix/sysv/linux/fstatat64.c
@@ -39,31 +39,32 @@ __fstatat64_time64 (int fd, const char *file, struct __stat64_t64 *buf,
/* 32-bit kABI with default 64-bit time_t, e.g. arc, riscv32. Also
64-bit time_t support is done through statx syscall. */
struct statx tmp;
- r = INLINE_SYSCALL_CALL (statx, fd, file, AT_NO_AUTOMOUNT | flag,
- STATX_BASIC_STATS, &tmp);
- if (r == 0 || errno != ENOSYS)
+ r = INTERNAL_SYSCALL_CALL (statx, fd, file, AT_NO_AUTOMOUNT | flag,
+ STATX_BASIC_STATS, &tmp);
+ if (r == 0)
{
- if (r == 0)
- __cp_stat64_t64_statx (buf, &tmp);
- return r;
+ __cp_stat64_t64_statx (buf, &tmp);
+ return 0;
}
+ if (-r != ENOSYS)
+ return INLINE_SYSCALL_ERROR_RETURN_VALUE (-r);
#endif
#if XSTAT_IS_XSTAT64
# ifdef __NR_newfstatat
/* 64-bit kABI, e.g. aarch64, ia64, powerpc64*, s390x, riscv64, and
x86_64. */
- r = INLINE_SYSCALL_CALL (newfstatat, fd, file, buf, flag);
+ r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, buf, flag);
# elif defined __NR_fstatat64
# if STAT64_IS_KERNEL_STAT64
/* 64-bit kABI outlier, e.g. alpha */
- r = INLINE_SYSCALL_CALL (fstatat64, fd, file, buf, flag);
+ r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, buf, flag);
# else
/* 64-bit kABI outlier, e.g. sparc64. */
struct kernel_stat64 kst64;
- r = INLINE_SYSCALL_CALL (fstatat64, fd, file, &kst64, flag);
+ r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &kst64, flag);
if (r == 0)
- r = __cp_stat64_kstat64 (buf, &kst64);
+ __cp_stat64_kstat64 (buf, &kst64);
# endif
# endif
#else
@@ -72,7 +73,7 @@ __fstatat64_time64 (int fd, const char *file, struct __stat64_t64 *buf,
e.g. arm, csky, i386, hppa, m68k, microblaze, nios2, sh, powerpc32,
and sparc32. */
struct stat64 st64;
- r = INLINE_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
+ r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
if (r == 0)
{
/* Clear both pad and reserved fields. */
@@ -95,13 +96,15 @@ __fstatat64_time64 (int fd, const char *file, struct __stat64_t64 *buf,
# else
/* 64-bit kabi outlier, e.g. mips64 and mips64-n32. */
struct kernel_stat kst;
- r = INLINE_SYSCALL_CALL (newfstatat, fd, file, &kst, flag);
+ r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, &kst, flag);
if (r == 0)
- r = __cp_kstat_stat64_t64 (&kst, buf);
+ __cp_kstat_stat64_t64 (&kst, buf);
# endif
#endif
- return r;
+ return INTERNAL_SYSCALL_ERROR_P (r)
+ ? INLINE_SYSCALL_ERROR_RETURN_VALUE (-r)
+ : 0;
}
#if __TIMESIZE != 64
hidden_def (__fstatat64_time64)
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/kstat_cp.h b/sysdeps/unix/sysv/linux/mips/mips64/kstat_cp.h
index 1805d4b85f..71fe39fdd0 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/kstat_cp.h
+++ b/sysdeps/unix/sysv/linux/mips/mips64/kstat_cp.h
@@ -19,13 +19,13 @@
#include <sys/stat.h>
#include <kernel_stat.h>
-static inline int
+static inline long int
__cp_kstat_stat (const struct kernel_stat *kst, struct stat *st)
{
if (! in_ino_t_range (kst->st_ino)
|| ! in_off_t_range (kst->st_size)
|| ! in_blkcnt_t_range (kst->st_blocks))
- return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
+ return -EOVERFLOW;
st->st_dev = kst->st_dev;
memset (&st->st_pad1, 0, sizeof (st->st_pad1));
@@ -51,7 +51,7 @@ __cp_kstat_stat (const struct kernel_stat *kst, struct stat *st)
return 0;
}
-static inline int
+static inline void
__cp_kstat_stat64_t64 (const struct kernel_stat *kst, struct __stat64_t64 *st)
{
st->st_dev = kst->st_dev;
@@ -70,6 +70,4 @@ __cp_kstat_stat64_t64 (const struct kernel_stat *kst, struct __stat64_t64 *st)
st->st_mtim.tv_nsec = kst->st_mtime_nsec;
st->st_ctim.tv_sec = kst->st_ctime_sec;
st->st_ctim.tv_nsec = kst->st_ctime_nsec;
-
- return 0;
}
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/kstat_cp.h b/sysdeps/unix/sysv/linux/sparc/sparc64/kstat_cp.h
index 0599b6a49e..d3f2841ade 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/kstat_cp.h
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/kstat_cp.h
@@ -18,7 +18,7 @@
#include <errno.h>
-static inline int
+static inline void
__cp_stat64_kstat64 (struct stat64 *st64, const struct kernel_stat64 *kst64)
{
st64->st_dev = kst64->st_dev;
@@ -41,6 +41,4 @@ __cp_stat64_kstat64 (struct stat64 *st64, const struct kernel_stat64 *kst64)
st64->st_ctim.tv_nsec = kst64->st_ctime_nsec;
st64->__glibc_reserved4 = 0;
st64->__glibc_reserved5 = 0;
-
- return 0;
}
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