[merged] fs-signalfdc-fix-inconsistent-return-codes-for-signalfd4.patch removed from -mm tree

[merged] fs-signalfdc-fix-inconsistent-return-codes-for-signalfd4.patch removed from -mm tree

[akpm]

The patch titled
     Subject: fs/signalfd.c: fix inconsistent return codes for signalfd4
has been removed from the -mm tree.  Its filename was
     fs-signalfdc-fix-inconsistent-return-codes-for-signalfd4.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Helge Deller <deller@gmx.de>
Subject: 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.

Link: http://lkml.kernel.org/r/20200530100707.GA10159@ls3530.fritz.box
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/signalfd.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/fs/signalfd.c~fs-signalfdc-fix-inconsistent-return-codes-for-signalfd4
+++ a/fs/signalfd.c
@@ -314,9 +314,10 @@ SYSCALL_DEFINE4(signalfd4, int, ufd, sig
 {
 	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, sigs
 {
 	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);
 }
 
_

Patches currently in -mm which might be from deller@gmx.de are