linux-kernel - Re: [PATCH] powerpc/interrupt: Fix OOPS by not calling do_IRQ() from timer

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Message-Id: <162885586792.2317031.17954514979013171970.b4-ty@ellerman.id.au>
Date:   Fri, 13 Aug 2021 21:57:47 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        fthain@...ux-m68k.org, npiggin@...il.com,
        Michael Ellerman <mpe@...erman.id.au>, userm57@...oo.com,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/interrupt: Fix OOPS by not calling do_IRQ() from timer_interrupt()

On Tue, 10 Aug 2021 16:13:16 +0000 (UTC), Christophe Leroy wrote:
> An interrupt handler shall not be called from another interrupt
> handler otherwise this leads to problems like the following:
> 
> 	Kernel attempted to write user page (afd4fa84) - exploit attempt? (uid: 1000)
> 	------------[ cut here ]------------
> 	Bug: Write fault blocked by KUAP!
> 	WARNING: CPU: 0 PID: 1617 at arch/powerpc/mm/fault.c:230 do_page_fault+0x484/0x720
> 	Modules linked in:
> 	CPU: 0 PID: 1617 Comm: sshd Tainted: G        W         5.13.0-pmac-00010-g8393422eb77 #7
> 	NIP:  c001b77c LR: c001b77c CTR: 00000000
> 	REGS: cb9e5bc0 TRAP: 0700   Tainted: G        W          (5.13.0-pmac-00010-g8393422eb77)
> 	MSR:  00021032 <ME,IR,DR,RI>  CR: 24942424  XER: 00000000
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/interrupt: Fix OOPS by not calling do_IRQ() from timer_interrupt()
      https://git.kernel.org/powerpc/c/98694166c27d473c36b434bd3572934c2f2a16ab

cheers