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authorHelge Deller <deller@gmx.de>2020-08-11 18:36:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-12 10:58:01 -0700
commita089e3fd5a82aea20f3d9ec4caa5f4c65cc2cfcc (patch)
tree1f7ef4eccc8f472d610f70e42df59f281bdcdf8b /fs
parenta090a5a7d73f79a9ae2dcc6e60d89bfc6864a65a (diff)
downloadlinux-a089e3fd5a82aea20f3d9ec4caa5f4c65cc2cfcc.tar.bz2
fs/signalfd.c: fix inconsistent return codes for signalfd4
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/signalfd.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/signalfd.c b/fs/signalfd.c
index 44b6845b071c..5b78719be445 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -314,9 +314,10 @@ 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);
}
@@ -325,9 +326,10 @@ 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);
}