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From: guoren@kernel.org
To: linux-kernel@vger.kernel.org, paul.walmsley@sifive.com,
	palmer@dabbelt.com, alexghiti@rivosinc.com, charlie@rivosinc.com,
	xiao.w.wang@intel.com, guoren@kernel.org, david@redhat.com,
	panqinglin2020@iscas.ac.cn, rick.p.edgecombe@intel.com,
	willy@infradead.org, bjorn@rivosinc.com,
	conor.dooley@microchip.com, cleger@rivosinc.com,
	leobras@redhat.com
Cc: linux-riscv@lists.infradead.org,
	Guo Ren <guoren@linux.alibaba.com>,
	stable@vger.kernel.org
Subject: [PATCH V2 1/4] riscv: mm: Fixup compat mode boot failure
Date: Thu, 21 Dec 2023 10:46:58 -0500	[thread overview]
Message-ID: <20231221154702.2267684-2-guoren@kernel.org> (raw)
In-Reply-To: <20231221154702.2267684-1-guoren@kernel.org>

From: Guo Ren <guoren@linux.alibaba.com>

In COMPAT mode, the STACK_TOP is 0x80000000, but the TASK_SIZE is
0x7fff000. When the user stack is upon 0x7fff000, it will cause a user
segment fault. Sometimes, it would cause boot failure when the whole
rootfs is rv32.

Freeing unused kernel image (initmem) memory: 2236K
Run /sbin/init as init process
Starting init: /sbin/init exists but couldn't execute it (error -14)
Run /etc/init as init process
...

Cc: stable@vger.kernel.org
Fixes: add2cc6b6515 ("RISC-V: mm: Restrict address space for sv39,sv48,sv57")
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 arch/riscv/include/asm/pgtable.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index ab00235b018f..74ffb2178f54 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -881,7 +881,7 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
 #define TASK_SIZE_MIN	(PGDIR_SIZE_L3 * PTRS_PER_PGD / 2)
 
 #ifdef CONFIG_COMPAT
-#define TASK_SIZE_32	(_AC(0x80000000, UL) - PAGE_SIZE)
+#define TASK_SIZE_32	(_AC(0x80000000, UL))
 #define TASK_SIZE	(test_thread_flag(TIF_32BIT) ? \
 			 TASK_SIZE_32 : TASK_SIZE_64)
 #else
-- 
2.40.1


WARNING: multiple messages have this Message-ID (diff)
From: guoren@kernel.org
To: linux-kernel@vger.kernel.org, paul.walmsley@sifive.com,
	palmer@dabbelt.com, alexghiti@rivosinc.com, charlie@rivosinc.com,
	xiao.w.wang@intel.com, guoren@kernel.org, david@redhat.com,
	panqinglin2020@iscas.ac.cn, rick.p.edgecombe@intel.com,
	willy@infradead.org, bjorn@rivosinc.com,
	conor.dooley@microchip.com, cleger@rivosinc.com,
	leobras@redhat.com
Cc: linux-riscv@lists.infradead.org,
	Guo Ren <guoren@linux.alibaba.com>,
	stable@vger.kernel.org
Subject: [PATCH V2 1/4] riscv: mm: Fixup compat mode boot failure
Date: Thu, 21 Dec 2023 10:46:58 -0500	[thread overview]
Message-ID: <20231221154702.2267684-2-guoren@kernel.org> (raw)
In-Reply-To: <20231221154702.2267684-1-guoren@kernel.org>

From: Guo Ren <guoren@linux.alibaba.com>

In COMPAT mode, the STACK_TOP is 0x80000000, but the TASK_SIZE is
0x7fff000. When the user stack is upon 0x7fff000, it will cause a user
segment fault. Sometimes, it would cause boot failure when the whole
rootfs is rv32.

Freeing unused kernel image (initmem) memory: 2236K
Run /sbin/init as init process
Starting init: /sbin/init exists but couldn't execute it (error -14)
Run /etc/init as init process
...

Cc: stable@vger.kernel.org
Fixes: add2cc6b6515 ("RISC-V: mm: Restrict address space for sv39,sv48,sv57")
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 arch/riscv/include/asm/pgtable.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index ab00235b018f..74ffb2178f54 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -881,7 +881,7 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
 #define TASK_SIZE_MIN	(PGDIR_SIZE_L3 * PTRS_PER_PGD / 2)
 
 #ifdef CONFIG_COMPAT
-#define TASK_SIZE_32	(_AC(0x80000000, UL) - PAGE_SIZE)
+#define TASK_SIZE_32	(_AC(0x80000000, UL))
 #define TASK_SIZE	(test_thread_flag(TIF_32BIT) ? \
 			 TASK_SIZE_32 : TASK_SIZE_64)
 #else
-- 
2.40.1


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http://lists.infradead.org/mailman/listinfo/linux-riscv

  reply	other threads:[~2023-12-21 15:47 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-12-21 15:46 [PATCH V2 0/4] riscv: mm: Fixup & Optimize COMPAT code guoren
2023-12-21 15:46 ` guoren
2023-12-21 15:46 ` guoren [this message]
2023-12-21 15:46   ` [PATCH V2 1/4] riscv: mm: Fixup compat mode boot failure guoren
2023-12-22  1:51   ` Leonardo Bras
2023-12-22  1:51     ` Leonardo Bras
2023-12-22  2:57     ` Guo Ren
2023-12-22  2:57       ` Guo Ren
2023-12-22  3:50       ` Charlie Jenkins
2023-12-22  3:50         ` Charlie Jenkins
2023-12-22  4:32         ` Leonardo Bras
2023-12-22  4:32           ` Leonardo Bras
2023-12-22  7:33           ` Guo Ren
2023-12-22  7:33             ` Guo Ren
2023-12-22 10:58         ` Guo Ren
2023-12-22 10:58           ` Guo Ren
2023-12-21 15:46 ` [PATCH V2 2/4] riscv: mm: Fixup compat arch_get_mmap_end guoren
2023-12-21 15:46   ` guoren
2023-12-22  3:34   ` Leonardo Bras
2023-12-22  3:34     ` Leonardo Bras
2023-12-22  4:04     ` Charlie Jenkins
2023-12-22  4:04       ` Charlie Jenkins
2023-12-22  4:23       ` Leonardo Bras
2023-12-22  4:23         ` Leonardo Bras
2023-12-22  5:42         ` Charlie Jenkins
2023-12-22  5:42           ` Charlie Jenkins
2023-12-22  8:27           ` Leonardo Bras
2023-12-22  8:27             ` Leonardo Bras
2023-12-22  4:36       ` Guo Ren
2023-12-22  4:36         ` Guo Ren
2023-12-22  4:26     ` Guo Ren
2023-12-22  4:26       ` Guo Ren
2023-12-22  4:43       ` Leonardo Bras
2023-12-22  4:43         ` Leonardo Bras
2023-12-22  4:50         ` Guo Ren
2023-12-22  4:50           ` Guo Ren
2023-12-22  5:27           ` Leonardo Bras
2023-12-22  5:27             ` Leonardo Bras
2023-12-22  7:20             ` Guo Ren
2023-12-22  7:20               ` Guo Ren
2023-12-22  7:49               ` Leonardo Bras
2023-12-22  7:49                 ` Leonardo Bras
2023-12-22  8:59   ` David Laight
2023-12-22  8:59     ` David Laight
2023-12-22  9:33     ` Guo Ren
2023-12-22  9:33       ` Guo Ren
2023-12-21 15:47 ` [PATCH V2 3/4] riscv: mm: Remove unused TASK_SIZE_MIN guoren
2023-12-21 15:47   ` guoren
2023-12-22  4:49   ` Leonardo Bras
2023-12-22  4:49     ` Leonardo Bras
2023-12-22  7:16     ` Guo Ren
2023-12-22  7:16       ` Guo Ren
2023-12-22  7:22       ` Leonardo Bras
2023-12-22  7:22         ` Leonardo Bras
2023-12-21 15:47 ` [PATCH V2 4/4] riscv: mm: Optimize TASK_SIZE definition guoren
2023-12-21 15:47   ` guoren
2023-12-22  5:09   ` Leonardo Bras
2023-12-22  5:09     ` Leonardo Bras
2023-12-22 11:25     ` Guo Ren
2023-12-22 11:25       ` Guo Ren
2023-12-22 11:52       ` David Laight
2023-12-22 11:52         ` David Laight
2023-12-23  2:38         ` Guo Ren
2023-12-23  2:38           ` Guo Ren
2023-12-23  2:52         ` Guo Ren
2023-12-23  2:52           ` Guo Ren
2023-12-23 10:31           ` David Laight
2023-12-23 10:31             ` David Laight
2023-12-24  1:24             ` Guo Ren
2023-12-24  1:24               ` Guo Ren
2023-12-24 14:37               ` David Laight
2023-12-24 14:37                 ` David Laight

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