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[PATCH] Add epoll compat_ code to fs/compat.c

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IA64 and ARM-OABI are currently using their own version of epoll compat_
code.

An architecture needs epoll_event translation if alignof(u64) in 32 bit
mode is different from alignof(u64) in 64 bit mode.  If an architecture
needs epoll_event translation, it must define struct compat_epoll_event in
asm/compat.h and set CONFIG_HAVE_COMPAT_EPOLL_EVENT and use
compat_sys_epoll_ctl and compat_sys_epoll_wait.

All 64 bit architecture should use compat_sys_epoll_pwait.

[sfr: restructure and move to fs/compat.c, remove MIPS version
of compat_sys_epoll_pwait, use __put_user_unaligned]

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davide Libenzi 2007-03-07 20:41:21 -08:00 committed by Linus Torvalds
parent b40df5743e
commit f6dfb4fd7d
3 changed files with 119 additions and 46 deletions
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46
arch/mips/kernel/linux32.c
View file

@ -564,49 +564,3 @@ _sys32_clone(nabi_no_regargs struct pt_regs regs)
return do_fork(clone_flags, newsp, &regs, 0,
parent_tidptr, child_tidptr);
}
/*
* Implement the event wait interface for the eventpoll file. It is the kernel
* part of the user space epoll_pwait(2).
*/
asmlinkage long compat_sys_epoll_pwait(int epfd,
struct epoll_event __user *events, int maxevents, int timeout,
const compat_sigset_t __user *sigmask, size_t sigsetsize)
{
int error;
sigset_t ksigmask, sigsaved;
/*
* If the caller wants a certain signal mask to be set during the wait,
* we apply it here.
*/
if (sigmask) {
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (!access_ok(VERIFY_READ, sigmask, sizeof(ksigmask)))
return -EFAULT;
if (__copy_conv_sigset_from_user(&ksigmask, sigmask))
return -EFAULT;
sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
error = sys_epoll_wait(epfd, events, maxevents, timeout);
/*
* If we changed the signal mask, we need to restore the original one.
* In case we've got a signal while waiting, we do not restore the
* signal mask yet, and we allow do_signal() to deliver the signal on
* the way back to userspace, before the signal mask is restored.
*/
if (sigmask) {
if (error == -EINTR) {
memcpy(&current->saved_sigmask, &sigsaved,
sizeof(sigsaved));
set_thread_flag(TIF_RESTORE_SIGMASK);
} else
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
}
return error;
}

100
fs/compat.c
View file

@ -48,6 +48,7 @@
#include <linux/highmem.h>
#include <linux/poll.h>
#include <linux/mm.h>
#include <linux/eventpoll.h>
#include <net/sock.h> /* siocdevprivate_ioctl */
@ -2235,3 +2236,102 @@ long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
return sys_ni_syscall();
}
#endif
#ifdef CONFIG_EPOLL
#ifdef CONFIG_HAS_COMPAT_EPOLL_EVENT
asmlinkage long compat_sys_epoll_ctl(int epfd, int op, int fd,
struct compat_epoll_event __user *event)
{
long err = 0;
struct compat_epoll_event user;
struct epoll_event __user *kernel = NULL;
if (event) {
if (copy_from_user(&user, event, sizeof(user)))
return -EFAULT;
kernel = compat_alloc_user_space(sizeof(struct epoll_event));
err |= __put_user(user.events, &kernel->events);
err |= __put_user(user.data, &kernel->data);
}
return err ? err : sys_epoll_ctl(epfd, op, fd, kernel);
}
asmlinkage long compat_sys_epoll_wait(int epfd,
struct compat_epoll_event __user *events,
int maxevents, int timeout)
{
long i, ret, err = 0;
struct epoll_event __user *kbuf;
struct epoll_event ev;
if ((maxevents <= 0) ||
(maxevents > (INT_MAX / sizeof(struct epoll_event))))
return -EINVAL;
kbuf = compat_alloc_user_space(sizeof(struct epoll_event) * maxevents);
ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
for (i = 0; i < ret; i++) {
err |= __get_user(ev.events, &kbuf[i].events);
err |= __get_user(ev.data, &kbuf[i].data);
err |= __put_user(ev.events, &events->events);
err |= __put_user_unaligned(ev.data, &events->data);
events++;
}
return err ? -EFAULT: ret;
}
#endif /* CONFIG_HAS_COMPAT_EPOLL_EVENT */
#ifdef TIF_RESTORE_SIGMASK
asmlinkage long compat_sys_epoll_pwait(int epfd,
struct compat_epoll_event __user *events,
int maxevents, int timeout,
const compat_sigset_t __user *sigmask,
compat_size_t sigsetsize)
{
long err;
compat_sigset_t csigmask;
sigset_t ksigmask, sigsaved;
/*
* If the caller wants a certain signal mask to be set during the wait,
* we apply it here.
*/
if (sigmask) {
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
return -EFAULT;
sigset_from_compat(&ksigmask, &csigmask);
sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
#ifdef CONFIG_HAS_COMPAT_EPOLL_EVENT
err = compat_sys_epoll_wait(epfd, events, maxevents, timeout);
#else
err = sys_epoll_wait(epfd, events, maxevents, timeout);
#endif
/*
* If we changed the signal mask, we need to restore the original one.
* In case we've got a signal while waiting, we do not restore the
* signal mask yet, and we allow do_signal() to deliver the signal on
* the way back to userspace, before the signal mask is restored.
*/
if (sigmask) {
if (err == -EINTR) {
memcpy(&current->saved_sigmask, &sigsaved,
sizeof(sigsaved));
set_thread_flag(TIF_RESTORE_SIGMASK);
} else
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
}
return err;
}
#endif /* TIF_RESTORE_SIGMASK */
#endif /* CONFIG_EPOLL */

19
include/linux/compat.h
View file

@ -234,5 +234,24 @@ asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,
const compat_ulong_t __user *new_nodes);
/*
* epoll (fs/eventpoll.c) compat bits follow ...
*/
#ifndef CONFIG_HAS_COMPAT_EPOLL_EVENT
struct epoll_event;
#define compat_epoll_event epoll_event
#else
asmlinkage long compat_sys_epoll_ctl(int epfd, int op, int fd,
struct compat_epoll_event __user *event);
asmlinkage long compat_sys_epoll_wait(int epfd,
struct compat_epoll_event __user *events,
int maxevents, int timeout);
#endif
asmlinkage long compat_sys_epoll_pwait(int epfd,
struct compat_epoll_event __user *events,
int maxevents, int timeout,
const compat_sigset_t __user *sigmask,
compat_size_t sigsetsize);
#endif /* CONFIG_COMPAT */
#endif /* _LINUX_COMPAT_H */