linux-kernel - Re: [PATCH] powerpc/32s: Fix shift-out-of-bounds in KASAN init

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Date:   Wed, 08 Dec 2021 00:27:14 +1100
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Erhard Furtner <erhard_f@...lbox.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/32s: Fix shift-out-of-bounds in KASAN init

On Tue, 30 Nov 2021 09:42:37 +0100, Christophe Leroy wrote:
> ================================================================================
> UBSAN: shift-out-of-bounds in arch/powerpc/mm/kasan/book3s_32.c:22:23
> shift exponent -1 is negative
> CPU: 0 PID: 0 Comm: swapper Not tainted 5.15.5-gentoo-PowerMacG4 #9
> Call Trace:
> [c214be60] [c0ba0048] dump_stack_lvl+0x80/0xb0 (unreliable)
> [c214be80] [c0b99288] ubsan_epilogue+0x10/0x5c
> [c214be90] [c0b98fe0] __ubsan_handle_shift_out_of_bounds+0x94/0x138
> [c214bf00] [c1c0f010] kasan_init_region+0xd8/0x26c
> [c214bf30] [c1c0ed84] kasan_init+0xc0/0x198
> [c214bf70] [c1c08024] setup_arch+0x18/0x54c
> [c214bfc0] [c1c037f0] start_kernel+0x90/0x33c
> [c214bff0] [00003610] 0x3610
> ================================================================================
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/32s: Fix shift-out-of-bounds in KASAN init
      https://git.kernel.org/powerpc/c/af11dee4361b3519981fa04d014873f9d9edd6ac

cheers