diff options
| author | Helge Deller <deller@gmx.de> | 2020-08-11 18:36:04 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-26 10:31:02 +0200 |
| commit | 7c89e40ede2b0f1e292fb54d2e73fe952b4d44d8 (patch) | |
| tree | a9cf83e7eb3d1ae1977eaae6b81f40786993379d /fs/signalfd.c | |
| parent | 6afcb8b93400b774f3d74df7e1fc63805cbc92b3 (diff) | |
fs/signalfd.c: fix inconsistent return codes for signalfd4
[ Upstream commit a089e3fd5a82aea20f3d9ec4caa5f4c65cc2cfcc ]
The kernel signalfd4() syscall returns different error codes when called
either in compat or native mode. This behaviour makes correct emulation
in qemu and testing programs like LTP more complicated.
Fix the code to always return -in both modes- EFAULT for unaccessible user
memory, and EINVAL when called with an invalid signal mask.
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Laurent Vivier <laurent@vivier.eu>
Link: http://lkml.kernel.org/r/20200530100707.GA10159@ls3530.fritz.box
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/signalfd.c')
| -rw-r--r-- | fs/signalfd.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/signalfd.c b/fs/signalfd.c index 4fcd1498acf5..3c40a3bf772c 100644 --- a/fs/signalfd.c +++ b/fs/signalfd.c @@ -313,9 +313,10 @@ SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask, { sigset_t mask; - if (sizemask != sizeof(sigset_t) || - copy_from_user(&mask, user_mask, sizeof(mask))) + if (sizemask != sizeof(sigset_t)) return -EINVAL; + if (copy_from_user(&mask, user_mask, sizeof(mask))) + return -EFAULT; return do_signalfd4(ufd, &mask, flags); } @@ -324,9 +325,10 @@ SYSCALL_DEFINE3(signalfd, int, ufd, sigset_t __user *, user_mask, { sigset_t mask; - if (sizemask != sizeof(sigset_t) || - copy_from_user(&mask, user_mask, sizeof(mask))) + if (sizemask != sizeof(sigset_t)) return -EINVAL; + if (copy_from_user(&mask, user_mask, sizeof(mask))) + return -EFAULT; return do_signalfd4(ufd, &mask, 0); } |