lkml.org 
[lkml]   [2020]   [May]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH v2] 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>

---
Changelog v2:
- Rephrased commit message.

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);
}
\
 
 \ /
  Last update: 2020-05-30 12:08    [W:0.025 / U:4.924 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site