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ARM: 9109/1: oabi-compat: add epoll_pwait handler

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The epoll_wait() syscall has a special version for OABI compat
mode to convert the arguments to the EABI structure layout
of the kernel. However, the later epoll_pwait() syscall was
added in arch/arm in linux-2.6.32 without this conversion.

Use the same kind of handler for both.

Fixes: 369842658a ("ARM: 5677/1: ARM support for TIF_RESTORE_SIGMASK/pselect6/ppoll/epoll_pwait")
Cc: stable@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Arnd Bergmann 2021-08-11 08:30:20 +01:00 committed by Russell King (Oracle)
parent 344179fc7e
commit b6e47f3c11
2 changed files with 36 additions and 4 deletions
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38
arch/arm/kernel/sys_oabi-compat.c
View file

@ -265,9 +265,8 @@ asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
return do_epoll_ctl(epfd, op, fd, &kernel, false);
}
asmlinkage long sys_oabi_epoll_wait(int epfd,
struct oabi_epoll_event __user *events,
int maxevents, int timeout)
static long do_oabi_epoll_wait(int epfd, struct oabi_epoll_event __user *events,
int maxevents, int timeout)
{
struct epoll_event *kbuf;
struct oabi_epoll_event e;
@ -314,6 +313,39 @@ asmlinkage long sys_oabi_epoll_wait(int epfd,
}
#endif
SYSCALL_DEFINE4(oabi_epoll_wait, int, epfd,
struct oabi_epoll_event __user *, events,
int, maxevents, int, timeout)
{
return do_oabi_epoll_wait(epfd, events, maxevents, timeout);
}
/*
* Implement the event wait interface for the eventpoll file. It is the kernel
* part of the user space epoll_pwait(2).
*/
SYSCALL_DEFINE6(oabi_epoll_pwait, int, epfd,
struct oabi_epoll_event __user *, events, int, maxevents,
int, timeout, const sigset_t __user *, sigmask,
size_t, sigsetsize)
{
int error;
/*
* If the caller wants a certain signal mask to be set during the wait,
* we apply it here.
*/
error = set_user_sigmask(sigmask, sigsetsize);
if (error)
return error;
error = do_oabi_epoll_wait(epfd, events, maxevents, timeout);
restore_saved_sigmask_unless(error == -EINTR);
return error;
}
#endif
struct oabi_sembuf {
unsigned short sem_num;
short sem_op;

2
arch/arm/tools/syscall.tbl
View file

@ -360,7 +360,7 @@
343 common vmsplice sys_vmsplice
344 common move_pages sys_move_pages
345 common getcpu sys_getcpu
346 common epoll_pwait sys_epoll_pwait
346 common epoll_pwait sys_epoll_pwait sys_oabi_epoll_pwait
347 common kexec_load sys_kexec_load
348 common utimensat sys_utimensat_time32
349 common signalfd sys_signalfd