path: root/fs
diff options
authorArnd Bergmann <arnd@arndb.de>2019-03-25 15:34:53 +0100
committerJens Axboe <axboe@kernel.dk>2019-03-25 10:06:03 -0600
commit9e75ad5d8f399a21c86271571aa630dd080223e2 (patch)
tree6928ca0e842d8421e4cf2323e4403be71b22c7b0 /fs
parent85fae294e1a506b4213668716acb586bd6b4ae1e (diff)
io_uring: fix big-endian compat signal mask handling
On big-endian architectures, the signal masks are differnet between 32-bit and 64-bit tasks, so we have to use a different function for reading them from user space. io_cqring_wait() initially got this wrong, and always interprets this as a native structure. This is ok on x86 and most arm64, but not on s390, ppc64be, mips64be, sparc64 and parisc. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs')
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 6aaa30580a2b..8f48d29abf76 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1968,7 +1968,15 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
return 0;
if (sig) {
- ret = set_user_sigmask(sig, &ksigmask, &sigsaved, sigsz);
+ if (in_compat_syscall())
+ ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig,
+ &ksigmask, &sigsaved, sigsz);
+ else
+ ret = set_user_sigmask(sig, &ksigmask,
+ &sigsaved, sigsz);
if (ret)
return ret;