From: Liu Shixin <liushixin2@huawei.com>
To: Marco Elver <elver@google.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>
Cc: Liu Shixin <liushixin2@huawei.com>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH] powerpc: don't select KFENCE on platform PPC_FSL_BOOK3E
Date: Fri, 24 Sep 2021 14:39:27 +0800 [thread overview]
Message-ID: <20210924063927.1341241-1-liushixin2@huawei.com> (raw)
On platform PPC_FSL_BOOK3E, all lowmem is managed by tlbcam. That means
we didn't really map the kfence pool with page granularity. Therefore,
if KFENCE is enabled, the system will hit the following panic:
BUG: Kernel NULL pointer dereference on read at 0x00000000
Faulting instruction address: 0xc01de598
Oops: Kernel access of bad area, sig: 11 [#1]
BE PAGE_SIZE=4K SMP NR_CPUS=4 MPC8544 DS
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.12.0-rc3+ #298
NIP: c01de598 LR: c08ae9c4 CTR: 00000000
REGS: c0b4bea0 TRAP: 0300 Not tainted (5.12.0-rc3+)
MSR: 00021000 <CE,ME> CR: 24000228 XER: 20000000
DEAR: 00000000 ESR: 00000000
GPR00: c08ae9c4 c0b4bf60 c0ad64e0 ef720000 00021000 00000000 00000000 00000200
GPR08: c0ad5000 00000000 00000000 00000004 00000000 008fbb30 00000000 00000000
GPR16: 00000000 00000000 00000000 00000000 c0000000 00000000 00000000 00000000
GPR24: c08ca004 c08ca004 c0b6a0e0 c0b60000 c0b58f00 c0850000 c08ca000 ef720000
NIP [c01de598] kfence_protect+0x44/0x6c
LR [c08ae9c4] kfence_init+0xfc/0x2a4
Call Trace:
[c0b4bf60] [efffe160] 0xefffe160 (unreliable)
[c0b4bf70] [c08ae9c4] kfence_init+0xfc/0x2a4
[c0b4bfb0] [c0894d3c] start_kernel+0x3bc/0x574
[c0b4bff0] [c0000470] set_ivor+0x14c/0x188
Instruction dump:
7c0802a6 8109d594 546a653a 90010014 54630026 39200000 7d48502e 2c0a0000
41820010 554a0026 5469b53a 7d295214 <81490000> 38831000 554a003c 91490000
random: get_random_bytes called from print_oops_end_marker+0x40/0x78 with crng_init=0
---[ end trace 0000000000000000 ]---
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
---
arch/powerpc/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index d46db0bfb998..cffd57bcb5e4 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -185,7 +185,7 @@ config PPC
select HAVE_ARCH_KASAN if PPC32 && PPC_PAGE_SHIFT <= 14
select HAVE_ARCH_KASAN_VMALLOC if PPC32 && PPC_PAGE_SHIFT <= 14
select HAVE_ARCH_KGDB
- select HAVE_ARCH_KFENCE if PPC32
+ select HAVE_ARCH_KFENCE if PPC32 && !PPC_FSL_BOOK3E
select HAVE_ARCH_MMAP_RND_BITS
select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
select HAVE_ARCH_NVRAM_OPS
--
2.18.0.huawei.25
next reply other threads:[~2021-09-24 6:28 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-24 6:39 Liu Shixin [this message]
2021-09-24 6:41 ` [PATCH] powerpc: don't select KFENCE on platform PPC_FSL_BOOK3E Christophe Leroy
2021-09-25 3:10 ` Liu Shixin
2021-09-28 3:06 ` Liu Shixin
2021-10-12 1:43 ` Liu Shixin
2021-10-12 5:41 ` LEROY Christophe
2021-10-12 6:24 ` Michael Ellerman
2021-10-12 17:28 ` Christophe Leroy
2021-10-13 0:48 ` Michael Ellerman
2021-10-13 8:16 ` Christophe Leroy
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