From: Kefeng Wang <wangkefeng.wang@huawei.com> To: Russell King <linux@armlinux.org.uk>, <linux-arm-kernel@lists.infradead.org> Cc: Catalin Marinas <catalin.marinas@arm.com>, <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Jungseung Lee <js07.lee@gmail.com>, Kefeng Wang <wangkefeng.wang@huawei.com> Subject: [PATCH 2/2] ARM: mm: Fix PXN process when ARM_LPAE enabled Date: Sat, 29 May 2021 11:41:38 +0800 [thread overview] Message-ID: <20210529034138.83384-3-wangkefeng.wang@huawei.com> (raw) In-Reply-To: <20210529034138.83384-1-wangkefeng.wang@huawei.com> If we support PXN feature, should panic when user code execution with privilege mode, but it is not true when LAPE enabled, let's fix it by adding the check in do_page_fault(). Fixes: 1d4d37159d01 ("ARM: 8235/1: Support for the PXN CPU feature on ARMv7") Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- arch/arm/mm/fault.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index 81cf3e6e2a3d..a6ada914cdf5 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -241,8 +241,13 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) vm_flags = VM_WRITE; } - if (fsr & FSR_LNX_PF) + if (fsr & FSR_LNX_PF) { vm_flags = VM_EXEC; +#ifdef CONFIG_ARM_LPAE + if (addr < TASK_SIZE && !user_mode(regs)) + __do_kernel_fault(mm, addr, fsr, regs); +#endif + } perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr); -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: Kefeng Wang <wangkefeng.wang@huawei.com> To: Russell King <linux@armlinux.org.uk>, <linux-arm-kernel@lists.infradead.org> Cc: Catalin Marinas <catalin.marinas@arm.com>, <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Jungseung Lee <js07.lee@gmail.com>, Kefeng Wang <wangkefeng.wang@huawei.com> Subject: [PATCH 2/2] ARM: mm: Fix PXN process when ARM_LPAE enabled Date: Sat, 29 May 2021 11:41:38 +0800 [thread overview] Message-ID: <20210529034138.83384-3-wangkefeng.wang@huawei.com> (raw) In-Reply-To: <20210529034138.83384-1-wangkefeng.wang@huawei.com> If we support PXN feature, should panic when user code execution with privilege mode, but it is not true when LAPE enabled, let's fix it by adding the check in do_page_fault(). Fixes: 1d4d37159d01 ("ARM: 8235/1: Support for the PXN CPU feature on ARMv7") Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- arch/arm/mm/fault.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index 81cf3e6e2a3d..a6ada914cdf5 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -241,8 +241,13 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) vm_flags = VM_WRITE; } - if (fsr & FSR_LNX_PF) + if (fsr & FSR_LNX_PF) { vm_flags = VM_EXEC; +#ifdef CONFIG_ARM_LPAE + if (addr < TASK_SIZE && !user_mode(regs)) + __do_kernel_fault(mm, addr, fsr, regs); +#endif + } perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr); -- 2.26.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-05-29 3:38 UTC|newest] Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-29 3:41 [PATCH 0/2] ARM: fix PXN process with LPAE feature Kefeng Wang 2021-05-29 3:41 ` Kefeng Wang 2021-05-29 3:41 ` [PATCH 1/2] ARM: mm: Refactor __do_page_fault() Kefeng Wang 2021-05-29 3:41 ` Kefeng Wang 2021-06-01 14:31 ` Russell King (Oracle) 2021-06-01 14:31 ` Russell King (Oracle) 2021-06-02 6:42 ` Kefeng Wang 2021-06-02 6:42 ` Kefeng Wang 2023-06-02 9:49 ` Ard Biesheuvel 2023-06-02 9:49 ` Ard Biesheuvel 2023-06-02 9:51 ` Ard Biesheuvel 2023-06-02 9:51 ` Ard Biesheuvel 2023-06-02 9:59 ` Kefeng Wang 2023-06-02 9:59 ` Kefeng Wang 2021-05-29 3:41 ` Kefeng Wang [this message] 2021-05-29 3:41 ` [PATCH 2/2] ARM: mm: Fix PXN process when ARM_LPAE enabled Kefeng Wang 2021-06-01 13:29 ` [PATCH 0/2] ARM: fix PXN process with LPAE feature Kefeng Wang 2021-06-01 13:29 ` Kefeng Wang
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