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authorDeepa Dinamani <deepa.kernel@gmail.com>2018-09-20 07:41:04 +0300
committerArnd Bergmann <arnd@arndb.de>2018-12-06 19:22:38 +0300
commitded653ccbec0335a78fa7a7aff3ec9870349fafb (patch)
treecaf214e4cbbee0df4eb94c304651d7790b630f51 /fs/eventpoll.c
parent651022382c7f8da46cb4872a545ee1da6d097d2a (diff)
downloadlinux-ded653ccbec0335a78fa7a7aff3ec9870349fafb.tar.xz
signal: Add set_user_sigmask()
Refactor reading sigset from userspace and updating sigmask into an api. This is useful for versions of syscalls that pass in the sigmask and expect the current->sigmask to be changed during, and restored after, the execution of the syscall. With the advent of new y2038 syscalls in the subsequent patches, we add two more new versions of the syscalls (for pselect, ppoll, and io_pgetevents) in addition to the existing native and compat versions. Adding such an api reduces the logic that would need to be replicated otherwise. Note that the calls to sigprocmask() ignored the return value from the api as the function only returns an error on an invalid first argument that is hardcoded at these call sites. The updated logic uses set_current_blocked() instead. Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'fs/eventpoll.c')
-rw-r--r--fs/eventpoll.c22
1 files changed, 6 insertions, 16 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 42bbe6824b4b..2d86eeba837b 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -2223,14 +2223,9 @@ SYSCALL_DEFINE6(epoll_pwait, int, epfd, struct epoll_event __user *, events,
* 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 (copy_from_user(&ksigmask, sigmask, sizeof(ksigmask)))
- return -EFAULT;
- sigsaved = current->blocked;
- set_current_blocked(&ksigmask);
- }
+ error = set_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
+ if (error)
+ return error;
error = do_epoll_wait(epfd, events, maxevents, timeout);
@@ -2266,14 +2261,9 @@ COMPAT_SYSCALL_DEFINE6(epoll_pwait, int, epfd,
* 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 (get_compat_sigset(&ksigmask, sigmask))
- return -EFAULT;
- sigsaved = current->blocked;
- set_current_blocked(&ksigmask);
- }
+ err = set_compat_user_sigmask(sigmask, &ksigmask, &sigsaved, sigsetsize);
+ if (err)
+ return err;
err = do_epoll_wait(epfd, events, maxevents, timeout);