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linux: Consolidate xstat{64}

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The LFS support is implemented on xstat64.c, instead of xstat.c for
64-bit architectures.  The xstat.c implements the non-LFS it is
no-op for !XSTAT_IS_XSTAT64.

The generic non-LFS implementation handle two cases:

  1. New kABIs which uses generic pre 64-bit time Linux ABI (csky and
     nios): it issues __NR_fstat64 plus handle the overflow on st_ino,
     st_size, or st_blocks.  It only handles _STAT_VER_KERNEL.

  2. Old KABIs with old non-LFS support (arm, i386, hppa, m68k,
     microblaze, s390, sh, powerpc, and sparc32).  For _STAT_VER_KERNEL
     it issues __NR_stat, otherwise it issues __NR_stat64 and convert
     to non-LFS stat struct handling possible overflows on st_ino,
     st_size, or st_blocks.

Also the non-LFS mips is an outlier and it has its own implementation
since _STAT_VER_LINUX requires a different conversion function (it uses
the kernel_stat as the syscall argument since its exported ABI is
different than the kernel one for both non-LFS and LFS implementation).

The generic LFS implementation handles multiple cases:

  1. XSTAT_IS_XSTAT64 being 1:

    1.1. Old 64-bit kABI (ia64, powerpc64*, s390x, x86_64): it
         issues __NR_stat for _STAT_VER_KERNEL or _STAT_VER_LINUX.

    1.2. Old 64-bit kABI with defines __NR_stat64 instead of __NR_stat
	 (sparc64): it issues __NR_stat for _STAT_VER_KERNEL or
	 __NR_stat64 and convert to struct stat64.

    1.3. New kABIs which uses generic 64-bit Linux ABI (aarch64 and
         riscv64): it issues __NR_newfstatat and only for
         _STAT_VER_KERNEL.

    1.4. New 32-bit kABIs with only 64-bit time_t support (arc and
	 riscv32): it issues __NR_statx and covert to struct stat64.

  2. Old ABIs with XSTAT_IS_XSTAT64 being 0:

    2.1. New kABIs which uses generic pre 64-bit time Linux ABI (csky
	 and nios2): it issues __NR_fstatat64 for _STAT_VER_KERNEL.

    2.2. Old kABIs with old non-LFS support (arm, i386, hppa, m68k,
	 microblaze, s390, sh, mips32, powerpc32, and sparc32): it
	 issues __NR_stat64.

Also, two special cases requires specific LFS implementations:

  1. alpha: it requires to handle _STAT_VER_KERNEL64 to call __NR_stat64
     or use the kernel_stat with __NR_stat otherwise.

  2. mips64: as for non-LFS implementation its ABIs differ from glibc
     exported one, which requires an specific conversion function to
     handle the kernel_stat.

Checked with a build for all affected ABIs. I also checked on x86_64,
i686, powerpc, powerpc64le, sparcv9, sparc64, s390, and s390x.

Reviewed-by: Lukasz Majewski <lukma@denx.de>
This commit is contained in:
Adhemerval Zanella
2020-07-13 09:13:12 -03:00
parent 0b1c222cd0
commit 71aadfb8ae
20 changed files with 191 additions and 329 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
sysdeps/unix/sysv/linux/alpha/xstat.c
View File

@ -1,57 +0,0 @@
/* xstat using old-style Unix stat system call.
Copyright (C) 2004-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#define __xstat64 __xstat64_disable
#include <errno.h>
#include <stddef.h>
#include <sys/stat.h>
#include <kernel_stat.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <xstatconv.h>
#undef __xstat64
/* Get information about the file NAME in BUF. */
int
__xstat (int vers, const char *name, struct stat *buf)
{
int result;
struct kernel_stat kbuf;
if (vers == _STAT_VER_KERNEL64)
{
result = INTERNAL_SYSCALL_CALL (stat64, name, buf);
if (__glibc_likely (!INTERNAL_SYSCALL_ERROR_P (result)))
return result;
__set_errno (INTERNAL_SYSCALL_ERRNO (result));
return -1;
}
result = INTERNAL_SYSCALL_CALL (stat, name, &kbuf);
if (__glibc_likely (!INTERNAL_SYSCALL_ERROR_P (result)))
return __xstat_conv (vers, &kbuf, buf);
__set_errno (INTERNAL_SYSCALL_ERRNO (result));
return -1;
}
hidden_def (__xstat)
weak_alias (__xstat, _xstat);
strong_alias (__xstat, __xstat64);
hidden_ver (__xstat, __xstat64)

45
sysdeps/unix/sysv/linux/generic/xstat.c → sysdeps/unix/sysv/linux/alpha/xstat64.c
View File

@ -1,6 +1,6 @@
/* Copyright (C) 2011-2020 Free Software Foundation, Inc. /* xstat using old-style Unix stat system call.
Copyright (C) 2004-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
The GNU C Library is free software; you can redistribute it and/or The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public modify it under the terms of the GNU Lesser General Public
@ -16,33 +16,34 @@
License along with the GNU C Library. If not, see License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */ <https://www.gnu.org/licenses/>. */
/* Ignore prototype to avoid error if we alias __xstat and __xstat64. */ #define __xstat __redirect___xstat
#define __xstat64 __xstat64_disable
#include <errno.h>
#include <stddef.h>
#include <fcntl.h>
#include <sys/stat.h> #include <sys/stat.h>
#undef __xstat
#include <fcntl.h>
#include <kernel_stat.h> #include <kernel_stat.h>
#include <sysdep.h> #include <sysdep.h>
#include <sys/syscall.h> #include <xstatconv.h>
/* Get information about the file NAME in BUF. */ /* Get information about the file NAME in BUF. */
int int
__xstat (int vers, const char *name, struct stat *buf) __xstat64 (int vers, const char *name, struct stat64 *buf)
{ {
if (vers == _STAT_VER_KERNEL) switch (vers)
return INLINE_SYSCALL (newfstatat, 4, AT_FDCWD, name, buf, 0); {
case _STAT_VER_KERNEL64:
return INLINE_SYSCALL_CALL (stat64, name, buf);
errno = EINVAL; default:
return -1; {
struct kernel_stat kbuf;
int r = INTERNAL_SYSCALL_CALL (stat, name, &kbuf);
if (r == 0)
return __xstat_conv (vers, &kbuf, buf);
return INLINE_SYSCALL_ERROR_RETURN_VALUE (-r);
}
}
} }
weak_alias (__xstat64, __xstat);
weak_alias (__xstat64, __GI___xstat);
hidden_def (__xstat) hidden_def (__xstat64)
weak_alias (__xstat, _xstat);
#if XSTAT_IS_XSTAT64
#undef __xstat64
strong_alias (__xstat, __xstat64);
hidden_ver (__xstat, __xstat64)
#endif

1
sysdeps/unix/sysv/linux/arm/xstat.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/xstat.c>

54
sysdeps/unix/sysv/linux/generic/wordsize-32/xstat.c
View File

@ -1,54 +0,0 @@
/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stddef.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <kernel_stat.h>
#include <sysdep.h>
#include <sys/syscall.h>
#if !XSTAT_IS_XSTAT64
#include "overflow.h"
#include <statx_cp.h>
/* Get information about the file NAME in BUF. */
int
__xstat (int vers, const char *name, struct stat *buf)
{
if (vers == _STAT_VER_KERNEL)
{
# ifdef __NR_fstatat64
int rc = INLINE_SYSCALL (fstatat64, 4, AT_FDCWD, name, buf, 0);
# else
struct statx tmp;
int rc = INLINE_SYSCALL (statx, 5, AT_FDCWD, name, AT_NO_AUTOMOUNT,
STATX_BASIC_STATS, &tmp);
if (rc == 0)
__cp_stat64_statx ((struct stat64 *)buf, &tmp);
# endif
return rc ?: stat_overflow (buf);
}
errno = EINVAL;
return -1;
}
hidden_def (__xstat)
#endif

63
sysdeps/unix/sysv/linux/generic/wordsize-32/xstat64.c
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@ -1,63 +0,0 @@
/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
/* Hide the prototype for __xstat so that GCC will not complain about
the different function signature if it is aliased to __xstat64.
If XSTAT_IS_XSTAT64 is set to non-zero then the stat and stat64
structures have an identical layout but different type names. */
#define __xstat __xstat_disable
#include <errno.h>
#include <stddef.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <kernel_stat.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <statx_cp.h>
/* Get information about the file NAME in BUF. */
int
__xstat64 (int vers, const char *name, struct stat64 *buf)
{
if (vers == _STAT_VER_KERNEL)
{
#ifdef __NR_fstatat64
return INLINE_SYSCALL (fstatat64, 4, AT_FDCWD, name, buf, 0);
#else
struct statx tmp;
int rc = INLINE_SYSCALL (statx, 5, AT_FDCWD, name, AT_NO_AUTOMOUNT,
STATX_BASIC_STATS, &tmp);
if (rc == 0)
__cp_stat64_statx (buf, &tmp);
return rc;
#endif
}
errno = EINVAL;
return -1;
}
hidden_def (__xstat64)
#undef __xstat
#if XSTAT_IS_XSTAT64
strong_alias (__xstat64, __xstat)
hidden_ver (__xstat64, __xstat)
#endif

1
sysdeps/unix/sysv/linux/hppa/xstat.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/xstat.c>

59
sysdeps/unix/sysv/linux/i386/xstat.c
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@ -1,59 +0,0 @@
/* xstat using old-style Unix stat system call.
Copyright (C) 1991-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Ho hum, if xstat == xstat64 we must get rid of the prototype or gcc
will complain since they don't strictly match. */
#define __xstat64 __xstat64_disable
#include <errno.h>
#include <stddef.h>
#include <sys/stat.h>
#include <kernel_stat.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <xstatconv.h>
/* Get information about the file NAME in BUF. */
int
__xstat (int vers, const char *name, struct stat *buf)
{
int result;
if (vers == _STAT_VER_KERNEL)
return INLINE_SYSCALL (stat, 2, name, buf);
{
struct stat64 buf64;
result = INTERNAL_SYSCALL_CALL (stat64, name, &buf64);
if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (result)))
return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (result));
else
return __xstat32_conv (vers, &buf64, buf);
}
}
hidden_def (__xstat)
weak_alias (__xstat, _xstat);
#if XSTAT_IS_XSTAT64
# undef __xstat64
strong_alias (__xstat, __xstat64);
hidden_ver (__xstat, __xstat64)
#endif

1
sysdeps/unix/sysv/linux/m68k/xstat.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/xstat.c>

1
sysdeps/unix/sysv/linux/microblaze/xstat.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/xstat.c>

16
sysdeps/unix/sysv/linux/mips/mips64/xstat64.c
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@ -1,4 +1,4 @@
/* xstat64 using 64-bit MIPS stat system call. /* xstat64 using Linux stat64 system call.
Copyright (C) 1991-2020 Free Software Foundation, Inc. Copyright (C) 1991-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
@ -16,14 +16,9 @@
License along with the GNU C Library; if not, see License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */ <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stddef.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <kernel_stat.h> #include <kernel_stat.h>
#include <sysdep.h> #include <sysdep.h>
#include <sys/syscall.h>
#include <xstatconv.h> #include <xstatconv.h>
/* Get information about the file NAME in BUF. */ /* Get information about the file NAME in BUF. */
@ -31,14 +26,9 @@
int int
__xstat64 (int vers, const char *name, struct stat64 *buf) __xstat64 (int vers, const char *name, struct stat64 *buf)
{ {
int result;
struct kernel_stat kbuf; struct kernel_stat kbuf;
int r = INLINE_SYSCALL_CALL (stat, name, &kbuf);
result = INLINE_SYSCALL (stat, 2, name, &kbuf); return r ?: __xstat64_conv (vers, &kbuf, buf);
if (result == 0)
result = __xstat64_conv (vers, &kbuf, buf);
return result;
} }
hidden_def (__xstat64) hidden_def (__xstat64)

30
sysdeps/unix/sysv/linux/wordsize-64/xstat.c → sysdeps/unix/sysv/linux/mips/xstat.c
View File

@ -16,29 +16,27 @@
License along with the GNU C Library; if not, see License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */ <https://www.gnu.org/licenses/>. */
/* Ho hum, since xstat == xstat64 we must get rid of the prototype or gcc
will complain since they don't strictly match. */
#define __xstat64 __xstat64_disable
#include <errno.h>
#include <stddef.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <fcntl.h>
#include <kernel_stat.h>
#include <sysdep.h> #include <sysdep.h>
#include <sys/syscall.h> #include <xstatconv.h>
/* Get information about the file NAME in BUF. */ /* Get information about the file NAME in BUF. */
int int
__xstat (int vers, const char *name, struct stat *buf) __xstat (int vers, const char *name, struct stat *buf)
{ {
if (vers == _STAT_VER_KERNEL || vers == _STAT_VER_LINUX) switch (vers)
return INLINE_SYSCALL (stat, 2, name, buf); {
case _STAT_VER_KERNEL:
return INLINE_SYSCALL_CALL (stat, name, buf);
__set_errno (EINVAL); default:
return -1; {
struct kernel_stat kbuf;
int r = INTERNAL_SYSCALL_CALL (stat, name, &kbuf);
return r ?: __xstat_conv (vers, &kbuf, buf);
}
}
} }
hidden_def (__xstat) hidden_def (__xstat)
weak_alias (__xstat, _xstat);
#undef __xstat64
strong_alias (__xstat, __xstat64);
hidden_ver (__xstat, __xstat64)

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/xstat.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/xstat.c>

1
sysdeps/unix/sysv/linux/s390/s390-32/xstat.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/xstat.c>

1
sysdeps/unix/sysv/linux/sh/xstat.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/xstat.c>

1
sysdeps/unix/sysv/linux/sparc/sparc32/xstat.c
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@ -1 +0,0 @@
#include <sysdeps/unix/sysv/linux/i386/xstat.c>

1
sysdeps/unix/sysv/linux/sparc/sparc64/xstat.c
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@ -1 +0,0 @@
#include "../../i386/xstat.c"

1
sysdeps/unix/sysv/linux/wordsize-64/xstat64.c
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@ -1 +0,0 @@
/* xstat64 is in xstat.c */

58
sysdeps/unix/sysv/linux/xstat.c
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@ -16,44 +16,46 @@
License along with the GNU C Library; if not, see License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */ <https://www.gnu.org/licenses/>. */
/* Ho hum, if xstat == xstat64 we must get rid of the prototype or gcc
will complain since they don't strictly match. */
#define __xstat64 __xstat64_disable
#include <errno.h>
#include <stddef.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <fcntl.h>
#include <kernel_stat.h> #include <kernel_stat.h>
#include <sysdep.h> #include <sysdep.h>
#include <sys/syscall.h>
#include <xstatconv.h> #if !XSTAT_IS_XSTAT64
# include <xstatconv.h>
# include <xstatover.h>
/* Get information about the file NAME in BUF. */ /* Get information about the file NAME in BUF. */
int int
__xstat (int vers, const char *name, struct stat *buf) __xstat (int vers, const char *name, struct stat *buf)
{ {
if (vers == _STAT_VER_KERNEL) switch (vers)
return INLINE_SYSCALL (stat, 2, name, buf); {
case _STAT_VER_KERNEL:
{
# 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, AT_FDCWD, name, buf, 0);
return r ?: stat_overflow (buf);
# else
/* Old kABIs with old non-LFS support, e.g. arm, i386, hppa, m68k,
microblaze, s390, sh, powerpc, and sparc32. */
return INLINE_SYSCALL_CALL (stat, name, buf);
# endif
}
#if STAT_IS_KERNEL_STAT default:
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); {
#else # if STAT_IS_KERNEL_STAT
struct kernel_stat kbuf; return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
int result; # else
struct stat64 buf64;
result = INLINE_SYSCALL (stat, 2, name, &kbuf); int r = INLINE_SYSCALL_CALL (stat64, name, &buf64);
if (result == 0) return r ?: __xstat32_conv (vers, &buf64, buf);
result = __xstat_conv (vers, &kbuf, buf);
return result;
#endif #endif
}
}
} }
hidden_def (__xstat) hidden_def (__xstat)
weak_alias (__xstat, _xstat); #endif /* XSTAT_IS_XSTAT64 */
#if XSTAT_IS_XSTAT64
#undef __xstat64
strong_alias (__xstat, __xstat64);
hidden_ver (__xstat, __xstat64)
#endif

61
sysdeps/unix/sysv/linux/xstat64.c
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@ -16,24 +16,71 @@
License along with the GNU C Library; if not, see License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */ <https://www.gnu.org/licenses/>. */
#include <errno.h> #define __xstat __redirect___xstat
#include <stddef.h>
#include <sys/stat.h> #include <sys/stat.h>
#undef __xstat
#include <fcntl.h>
#include <kernel_stat.h> #include <kernel_stat.h>
#include <sysdep.h> #include <sysdep.h>
#include <sys/syscall.h> #include <xstatconv.h>
#include <statx_cp.h>
/* Get information about the file NAME in BUF. */ /* Get information about the file NAME in BUF. */
int int
___xstat64 (int vers, const char *name, struct stat64 *buf) ___xstat64 (int vers, const char *name, struct stat64 *buf)
{ {
int result; #if XSTAT_IS_XSTAT64
result = INLINE_SYSCALL (stat64, 2, name, buf); # ifdef __NR_stat64
return result; /* 64-bit kABI outlier, e.g. sparc64. */
if (vers == _STAT_VER_KERNEL)
return INLINE_SYSCALL_CALL (stat, name, buf);
else
{
struct stat64 st64;
int r = INLINE_SYSCALL_CALL (stat64, name, &st64);
return r ?: __xstat32_conv (vers, &st64, (struct stat *) buf);
}
# elif defined __NR_stat
/* Old 64-bit kABI, e.g. ia64, powerpc64*, s390x, and x86_64. */
if (vers == _STAT_VER_KERNEL || vers == _STAT_VER_LINUX)
return INLINE_SYSCALL_CALL (stat, name, buf);
# elif defined __NR_newfstatat
/* New kABIs which uses generic 64-bit Linux ABI, e.g. aarch64, riscv64. */
if (vers == _STAT_VER_KERNEL)
return INLINE_SYSCALL_CALL (newfstatat, AT_FDCWD, name, buf, 0);
# else
/* New 32-bit kABIs with only 64-bit time_t support, e.g. arc, riscv32. */
if (vers == _STAT_VER_KERNEL)
{
struct statx tmp;
int r = INLINE_SYSCALL_CALL (statx, AT_FDCWD, name, AT_NO_AUTOMOUNT,
STATX_BASIC_STATS, &tmp);
if (r == 0)
__cp_stat64_statx (buf, &tmp);
return r;
}
# endif
#else
# if STAT_IS_KERNEL_STAT
/* New kABIs which uses generic pre 64-bit time Linux ABI,
e.g. csky, nios2 */
if (vers == _STAT_VER_KERNEL)
return INLINE_SYSCALL_CALL (fstatat64, AT_FDCWD, name, buf, 0);
# else
/* Old kABIs with old non-LFS support, e.g. arm, i386, hppa, m68k,
microblaze, s390, sh, mips32, powerpc32, and sparc32. */
return INLINE_SYSCALL_CALL (stat64, name, buf);
# endif /* STAT_IS_KERNEL_STAT */
#endif /* XSTAT_IS_XSTAT64 */
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
} }
#if XSTAT_IS_XSTAT64
weak_alias (___xstat64, __xstat);
weak_alias (___xstat64, __GI___xstat);
#endif
#include <shlib-compat.h> #include <shlib-compat.h>

67
sysdeps/unix/sysv/linux/xstatover.h Normal file
View File

@ -0,0 +1,67 @@
/* Overflow tests for stat, statfs, and lseek functions.
Copyright (C) 2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <sys/stat.h>
#include <sys/statfs.h>
/* Test for overflows of structures where we ask the kernel to fill them
in with standard 64-bit syscalls but return them through APIs that
only expose the low 32 bits of some fields. */
static inline off_t lseek_overflow (loff_t res)
{
off_t retval = (off_t) res;
if (retval == res)
return retval;
__set_errno (EOVERFLOW);
return (off_t) -1;
}
static inline int stat_overflow (struct stat *buf)
{
#if defined __INO_T_MATCHES_INO64_T || !STAT_IS_KERNEL_STAT
return 0;
#else
if (buf->__st_ino_pad == 0 && buf->__st_size_pad == 0
&& buf->__st_blocks_pad == 0)
return 0;
__set_errno (EOVERFLOW);
return -1;
#endif
}
/* Note that f_files and f_ffree may validly be a sign-extended -1. */
static inline int statfs_overflow (struct statfs *buf)
{
#if __STATFS_MATCHES_STATFS64 || !STAT_IS_KERNEL_STAT
return 0;
#else
if (buf->__f_blocks_pad == 0 && buf->__f_bfree_pad == 0
&& buf->__f_bavail_pad == 0
&& (buf->__f_files_pad == 0
|| (buf->f_files == -1U && buf->__f_files_pad == -1))
&& (buf->__f_ffree_pad == 0
|| (buf->f_ffree == -1U && buf->__f_ffree_pad == -1)))
return 0;
__set_errno (EOVERFLOW);
return -1;
#endif
}