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Date: Thu, 6 Jun 2019 09:06:18 +0800
From: kbuild test robot <lkp@...el.com>
To: Oleg Nesterov <oleg@...hat.com>
Cc: kbuild-all@...org, Andrew Morton <akpm@...ux-foundation.org>,
Deepa Dinamani <deepa.kernel@...il.com>,
linux-kernel@...r.kernel.org, arnd@...db.de, dbueso@...e.de,
axboe@...nel.dk, dave@...olabs.net, e@...24.org, jbaron@...mai.com,
linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
omar.kilani@...il.com, tglx@...utronix.de, stable@...r.kernel.org,
Al Viro <viro@...IV.linux.org.uk>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
David Laight <David.Laight@...LAB.COM>
Subject: Re: [PATCH -mm 1/1] signal: simplify
set_user_sigmask/restore_user_sigmask
Hi Oleg,
I love your patch! Perhaps something to improve:
[auto build test WARNING on mmotm/master]
url: https://github.com/0day-ci/linux/commits/Oleg-Nesterov/signal-simplify-set_user_sigmask-restore_user_sigmask/20190606-062512
base: git://git.cmpxchg.org/linux-mmotm.git master
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gcc (GCC) 7.4.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.4.0 make.cross ARCH=sparc64
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>
Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
All warnings (new ones prefixed by >>):
In file included from include/linux/poll.h:12:0,
from include/linux/ring_buffer.h:7,
from include/linux/trace_events.h:6,
from include/trace/syscall.h:7,
from include/linux/syscalls.h:86,
from kernel/signal.c:30:
kernel/signal.c: In function 'set_user_sigmask':
include/linux/uaccess.h:113:7: warning: 'kmask' may be used uninitialized in this function [-Wmaybe-uninitialized]
res = raw_copy_from_user(to, from, n);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/signal.c:2960:12: note: 'kmask' was declared here
sigset_t *kmask;
^~~~~
kernel/signal.c: In function 'set_compat_user_sigmask':
>> kernel/signal.c:2986:6: warning: 'kmask' may be used uninitialized in this function [-Wmaybe-uninitialized]
if (get_compat_sigset(kmask, umask))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/kmask +2986 kernel/signal.c
2975
2976 #ifdef CONFIG_COMPAT
2977 int set_compat_user_sigmask(const compat_sigset_t __user *umask,
2978 size_t sigsetsize)
2979 {
2980 sigset_t *kmask;
2981
2982 if (!umask)
2983 return 0;
2984 if (sigsetsize != sizeof(compat_sigset_t))
2985 return -EINVAL;
> 2986 if (get_compat_sigset(kmask, umask))
2987 return -EFAULT;
2988
2989 set_restore_sigmask();
2990 current->saved_sigmask = current->blocked;
2991 set_current_blocked(kmask);
2992
2993 return 0;
2994 }
2995 #endif
2996
---
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