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sysvipc: Fix semtimedop for Linux < 5.1 for 64-bit ABI

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Both powerpc64 and s390x provides semtimedop through __NR_ipc for
pre v5.1 kernel.  Neither the y2038 support (7c437d3778) nor the
attempt to fix an issue for !__ASSUME_DIRECT_SYSVIPC_SYSCALLS
(aaa12e9ff0) took this in consideration.

This patch fixes it by issuing __NR_semtimedop_time64 iff it is
defined, otherwise __NR_semtimeop is issued if both
__ASSUME_DIRECT_SYSVIPC_SYSCALLS it set and __NR_semtimedop is
define, other __NR_ipc is used instead.  To summarize:

  1. For 32-bit architetures __NR_semtimedop_time64 is always
     issued.  The fallback is used only for !__ASSUME_TIME64_SYSCALLS
     and it issues either __NR_ipc or __NR_semtimedop.

  2. For 64-bit architecture with wire-up SysV syscall
     (__ASSUME_DIRECT_SYSVIPC_SYSCALLS and __NR_semtimeop defined)
     __NR_semtimeop is issued.

  3. Otherwise __NR_ipc is used instead.

Checked on x86_64-linux-gnu, i686-linux-gnu (kernel 4.15 and 5.4),
powerpc64le (kernel 4.18), and s390x (kernel 4.12).

Reviewed-by: Matheus Castanho <msc@linux.ibm.com>
This commit is contained in:
Adhemerval Zanella 2020-09-30 16:52:19 -03:00
parent e75fbaaa21
commit 2deb779390
1 changed files with 8 additions and 4 deletions
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12
sysdeps/unix/sysv/linux/semtimedop.c
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@ -26,11 +26,15 @@ int
__semtimedop64 (int semid, struct sembuf *sops, size_t nsops,
const struct __timespec64 *timeout)
{
#ifndef __NR_semtimedop_time64
# define __NR_semtimedop_time64 __NR_semtimedop
int r;
#if defined __NR_semtimedop_time64
r = INLINE_SYSCALL_CALL (semtimedop_time64, semid, sops, nsops, timeout);
#elif defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS && defined __NR_semtimedop
r = INLINE_SYSCALL_CALL (semtimedop, semid, sops, nsops, timeout);
#else
r = INLINE_SYSCALL_CALL (ipc, IPCOP_semtimedop, semid,
SEMTIMEDOP_IPC_ARGS (nsops, sops, timeout));
#endif
int r = INLINE_SYSCALL_CALL (semtimedop_time64, semid, sops, nsops,
timeout);
#ifndef __ASSUME_TIME64_SYSCALLS
if (r == 0 || errno != ENOSYS)