From: Julien Thierry <julien.thierry@xxxxxxx>
Commit 319508902600c2688e057750148487996396e9ca upstream.
Copy events to user using __copy_to_user() rather than copy members of
individually with __put_user_error().
This has the benefit of disabling/enabling PAN once per event intead of
once per event member.
Signed-off-by: Julien Thierry <julien.thierry@xxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Signed-off-by: David A. Long <dave.long@xxxxxxxxxx>
Reviewed-by: Julien Thierry <julien.thierry@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/kernel/sys_oabi-compat.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/arch/arm/kernel/sys_oabi-compat.c
+++ b/arch/arm/kernel/sys_oabi-compat.c
@@ -276,6 +276,7 @@ asmlinkage long sys_oabi_epoll_wait(int
int maxevents, int timeout)
{
struct epoll_event *kbuf;
+ struct oabi_epoll_event e;
mm_segment_t fs;
long ret, err, i;
@@ -294,8 +295,11 @@ asmlinkage long sys_oabi_epoll_wait(int
set_fs(fs);
err = 0;
for (i = 0; i < ret; i++) {
- __put_user_error(kbuf[i].events, &events->events, err);
- __put_user_error(kbuf[i].data, &events->data, err);
+ e.events = kbuf[i].events;
+ e.data = kbuf[i].data;
+ err = __copy_to_user(events, &e, sizeof(e));
+ if (err)
+ break;
events++;
}
kfree(kbuf);
