linux-kernel - Re: [PATCH] signal: move the "sig < SIGRTMIN" check into siginmask(sig)

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Message-ID: <alpine.LRH.2.20.1605181808140.20591@math.ut.ee>
Date:	Wed, 18 May 2016 21:30:57 +0300 (EEST)
From:	Meelis Roos <mroos@...ux.ee>
To:	Oleg Nesterov <oleg@...hat.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] signal: move the "sig < SIGRTMIN" check into
 siginmask(sig)

> All the users of siginmask() must ensure that sig < SIGRTMIN. sig_fatal()
> doesn't and this is wrong:
> 
> 	[  211.406327] UBSAN: Undefined behaviour in kernel/signal.c:911:6
> 	[  211.406365] shift exponent 32 is too large for 32-bit type 'long unsigned int'
> 
> the patch doesn't add the neccesary check to sig_fatal(), it moves the
> check into siginmask() and updates other callers.
> 
> Reported-by: Meelis Roos <mroos@...ux.ee>
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Tested on the same AthlonMP, on HP Proliant DL360G3 and PowerMac G4, 
successfully - system still works, warnings are gone.

-- 
Meelis Roos (mroos@...ux.ee)