linux-kernel - Re: [PATCH v2 25/43] powerpc/32: Replace ASM exception exit by C exception exit from ppc64

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Message-ID: <87tuphkdkz.fsf@mpe.ellerman.id.au>
Date:   Fri, 12 Mar 2021 00:46:36 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, npiggin@...il.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 25/43] powerpc/32: Replace ASM exception exit by C
 exception exit from ppc64

Christophe Leroy <christophe.leroy@...roup.eu> writes:
> This patch replaces the PPC32 ASM exception exit by C exception exit.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/kernel/entry_32.S  | 481 +++++++++-----------------------
>  arch/powerpc/kernel/interrupt.c |   4 +
>  2 files changed, 132 insertions(+), 353 deletions(-)

Bisect points to this breaking qemu mac99 for me, with pmac32_defconfig.

I haven't had time to dig any deeper sorry.

cheers


Freeing unused kernel memory: 1132K
This architecture does not have kernel memory protection.
Run /init as init process
init[1]: User access of kernel address (fffffd20) - exploit attempt? (uid: 0)
init[1]: segfault (11) at fffffd20 nip b7e78638 lr b7e845e4 code 1 in ld-2.27.so[b7e6b000+22000]
init[1]: code: 92010080 92210084 92410088 92810090 92a10094 92c10098 930100a0 932100a4
init[1]: code: 934100a8 936100ac 93a100b4 91810074 <7d41496e> 39400000 3b810017 579c0036
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00ERROR: Error: saw oops/warning etc. while expecting
00000b
CPU: 0 PID: 1 Comm: init Not tainted 5.12.0-rc2+ #1
Call Trace:
[f1019d80] [c004f1ec] panic+0x138/0x328 (unreliable)
[f1019de0] [c0051c8c] do_exit+0x880/0x8f4
[f1019e30] [c0052bdc] do_group_exit+0x40/0xa4
[f1019e50] [c0060d04] get_signal+0x1e8/0x834
[f1019eb0] [c000b624] do_notify_resume+0xc8/0x314
[f1019f10] [c0010da8] interrupt_exit_user_prepare+0xa4/0xdc
[f1019f30] [c0018228] interrupt_return+0x14/0x14c
--- interrupt: 300 at 0xb7e78638
NIP:  b7e78638 LR: b7e845e4 CTR: c01ea2d8
REGS: f1019f40 TRAP: 0300   Not tainted  (5.12.0-rc2+)
MSR:  0000d032 <EE,PR,ME,IR,DR,RI>  CR: 28004422  XER: 20000000
DAR: fffffd20 DSISR: 42000000
GPR00: b7e845e4 bf951440 00000000 bf951460 00000000 bf951718 fefefeff 7f7f7f7f
GPR08: bf9516b0 406ae8e0 b7eac1d4 00000000 0a12247b 00000000 b7e8a0d0 b7e78554
GPR16: bf951730 bf9516f0 b7eaaf40 bf9516f0 00000001 b7eaa688 10002178 bf951460
GPR24: 00000000 00000000 b7eac200 100cff38 bf9516f0 10002179 b7e845e4 bf951440
NIP [b7e78638] 0xb7e78638
LR [b7e845e4] 0xb7e845e4
--- interrupt: 300
Rebooting in 180 seconds..