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

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>

diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 30d433f14f935e6f7a426db41c420280a7cc99e5..1df544c1f966e1e10b21664e95c9da7a40efe106 100644 (file)
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -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;
-}

diff --git a/fs/compat.c b/fs/compat.c
index 0ec70e3cee0a6113e24b9282250dbcb950e144f1..040a8be38a4896af7334769a9cb26f852b5cc56a 100644 (file)
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -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 */

diff --git a/include/linux/compat.h b/include/linux/compat.h
index 80b17f440ec191ce352ad7bdb108e8a2fb806bd8..ccd863dd77fae4a654981181ba189f5c4604c155 100644 (file)
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -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 */