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signal: Guard against negative signal numbers in copy_siginfo_from_user32

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While fixing an out of bounds array access in known_siginfo_layout
reported by the kernel test robot it became apparent that the same bug
exists in siginfo_layout and affects copy_siginfo_from_user32.

The straight forward fix that makes guards against making this mistake
in the future and should keep the code size small is to just take an
unsigned signal number instead of a signed signal number, as I did to
fix known_siginfo_layout.

Cc: stable@vger.kernel.org
Fixes: cc731525f26a ("signal: Remove kernel interal si_code magic")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2018-10-10 20:29:44 -05:00
parent b2a2ab527d
commit a36700589b
2 changed files with 2 additions and 2 deletions
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2
include/linux/signal.h
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@ -40,7 +40,7 @@ enum siginfo_layout {
SIL_SYS,
};
enum siginfo_layout siginfo_layout(int sig, int si_code);
enum siginfo_layout siginfo_layout(unsigned sig, int si_code);
/*
* Define some primitives to manipulate sigset_t.

2
kernel/signal.c
View File

@ -2879,7 +2879,7 @@ static bool known_siginfo_layout(unsigned sig, int si_code)
return false;
}
enum siginfo_layout siginfo_layout(int sig, int si_code)
enum siginfo_layout siginfo_layout(unsigned sig, int si_code)
{
enum siginfo_layout layout = SIL_KILL;
if ((si_code > SI_USER) && (si_code < SI_KERNEL)) {