From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Vincent Chen <vincent.chen@sifive.com>,
Palmer Dabbelt <palmerdabbelt@google.com>,
Sasha Levin <sashal@kernel.org>,
kasan-dev@googlegroups.com, linux-riscv@lists.infradead.org
Subject: [PATCH AUTOSEL 5.7 11/25] riscv: kasan: use local_tlb_flush_all() to avoid uninitialized __sbi_rfence
Date: Mon, 27 Jul 2020 19:23:31 -0400 [thread overview]
Message-ID: <20200727232345.717432-11-sashal@kernel.org> (raw)
In-Reply-To: <20200727232345.717432-1-sashal@kernel.org>
From: Vincent Chen <vincent.chen@sifive.com>
[ Upstream commit 4cb699d0447be8e0906539f93cbe41e19598ee5a ]
It fails to boot the v5.8-rc4 kernel with CONFIG_KASAN because kasan_init
and kasan_early_init use uninitialized __sbi_rfence as executing the
tlb_flush_all(). Actually, at this moment, only the CPU which is
responsible for the system initialization enables the MMU. Other CPUs are
parking at the .Lsecondary_start. Hence the tlb_flush_all() is able to be
replaced by local_tlb_flush_all() to avoid using uninitialized
__sbi_rfence.
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/riscv/mm/kasan_init.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index ec0ca90dd9000..7a580c8ad6034 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@ -44,7 +44,7 @@ asmlinkage void __init kasan_early_init(void)
(__pa(((uintptr_t) kasan_early_shadow_pmd))),
__pgprot(_PAGE_TABLE)));
- flush_tlb_all();
+ local_flush_tlb_all();
}
static void __init populate(void *start, void *end)
@@ -79,7 +79,7 @@ static void __init populate(void *start, void *end)
pfn_pgd(PFN_DOWN(__pa(&pmd[offset])),
__pgprot(_PAGE_TABLE)));
- flush_tlb_all();
+ local_flush_tlb_all();
memset(start, 0, end - start);
}
--
2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
Vincent Chen <vincent.chen@sifive.com>,
linux-riscv@lists.infradead.org,
Palmer Dabbelt <palmerdabbelt@google.com>,
kasan-dev@googlegroups.com
Subject: [PATCH AUTOSEL 5.7 11/25] riscv: kasan: use local_tlb_flush_all() to avoid uninitialized __sbi_rfence
Date: Mon, 27 Jul 2020 19:23:31 -0400 [thread overview]
Message-ID: <20200727232345.717432-11-sashal@kernel.org> (raw)
In-Reply-To: <20200727232345.717432-1-sashal@kernel.org>
From: Vincent Chen <vincent.chen@sifive.com>
[ Upstream commit 4cb699d0447be8e0906539f93cbe41e19598ee5a ]
It fails to boot the v5.8-rc4 kernel with CONFIG_KASAN because kasan_init
and kasan_early_init use uninitialized __sbi_rfence as executing the
tlb_flush_all(). Actually, at this moment, only the CPU which is
responsible for the system initialization enables the MMU. Other CPUs are
parking at the .Lsecondary_start. Hence the tlb_flush_all() is able to be
replaced by local_tlb_flush_all() to avoid using uninitialized
__sbi_rfence.
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/riscv/mm/kasan_init.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index ec0ca90dd9000..7a580c8ad6034 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@ -44,7 +44,7 @@ asmlinkage void __init kasan_early_init(void)
(__pa(((uintptr_t) kasan_early_shadow_pmd))),
__pgprot(_PAGE_TABLE)));
- flush_tlb_all();
+ local_flush_tlb_all();
}
static void __init populate(void *start, void *end)
@@ -79,7 +79,7 @@ static void __init populate(void *start, void *end)
pfn_pgd(PFN_DOWN(__pa(&pmd[offset])),
__pgprot(_PAGE_TABLE)));
- flush_tlb_all();
+ local_flush_tlb_all();
memset(start, 0, end - start);
}
--
2.25.1
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next prev parent reply other threads:[~2020-07-27 23:29 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-27 23:23 [PATCH AUTOSEL 5.7 01/25] mt76: mt7615: fix lmac queue debugsfs entry Sasha Levin
2020-07-27 23:23 ` Sasha Levin
2020-07-27 23:23 ` Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 02/25] iwlwifi: fix crash in iwl_dbg_tlv_alloc_trigger Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 03/25] usb: hso: Fix debug compile warning on sparc32 Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 04/25] selftests: fib_nexthop_multiprefix: fix cleanup() netns deletion Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 05/25] qed: Disable "MFW indication via attention" SPAM every 5 minutes Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 06/25] selftests: net: ip_defrag: modprobe missing nf_defrag_ipv6 support Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 07/25] io_uring: always allow drain/link/hardlink/async sqe flags Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 08/25] habanalabs: prevent possible out-of-bounds array access Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 09/25] nfc: s3fwrn5: add missing release on skb in s3fwrn5_recv_frame Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 10/25] scsi: core: Run queue in case of I/O resource contention failure Sasha Levin
2020-07-27 23:23 ` Sasha Levin [this message]
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 11/25] riscv: kasan: use local_tlb_flush_all() to avoid uninitialized __sbi_rfence Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 12/25] parisc: add support for cmpxchg on u8 pointers Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 13/25] net: ethernet: ravb: exit if re-initialization fails in tx timeout Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 14/25] selftest: txtimestamp: fix net ns entry logic Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 15/25] drivers/net/wan/x25_asy: Fix to make it work Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 16/25] Revert "i2c: cadence: Fix the hold bit setting" Sasha Levin
2020-07-27 23:23 ` Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 17/25] i2c: cadence: Clear HOLD bit at correct time in Rx path Sasha Levin
2020-07-27 23:23 ` Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 18/25] x86/unwind/orc: Fix ORC for newly forked tasks Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 19/25] x86/stacktrace: Fix reliable check for empty user task stacks Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 20/25] cxgb4: add missing release on skb in uld_send() Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 21/25] io_uring: missed req_init_async() for IOSQE_ASYNC Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 22/25] xen-netfront: fix potential deadlock in xennet_remove() Sasha Levin
2020-07-27 23:23 ` Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 23/25] RISC-V: Set maximum number of mapped pages correctly Sasha Levin
2020-07-27 23:23 ` Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 24/25] drivers/net/wan: lapb: Corrected the usage of skb_cow Sasha Levin
2020-07-27 23:23 ` [PATCH AUTOSEL 5.7 25/25] riscv: Parse all memory blocks to remove unusable memory Sasha Levin
2020-07-27 23:23 ` Sasha Levin
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