From nobody Mon Feb 9 01:11:32 2026 Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 18B43175B1 for ; Wed, 31 Jul 2024 03:26:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722396419; cv=none; b=ksP0oqff//yk1ZcI1b5auChdbU5aJJsjijcDqXPnAhihx0P/wbXQXx1c8Me5mqgZ0RmRQLbuxsCGtqlL3bWFKKUokD7MwIXfpjGlLJPIAEzM4SsJn8zNCkYMRcz8URyYaF+CfV97adNJZ20Gij/UJcLBtmuX3b5ugDyCi3VDZdc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722396419; c=relaxed/simple; bh=liKaOn1dZUadxK42k7YYL4aluuKR8mZbXAqMmhNmRsw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=PV3jMVZEwc6/YMYlCRio5an9DS8oGX13CjmnrrP9gPR1MKqrXx3i2rUMvXzBJAXWONYkbjd2u1zpKiA0si9VkY7eFSTu0PWvplscZx5OXQDj+RBrHVSJ2bUuSm4LFr5JaofBhjgCEBcvw8ZGLneEFFiZNAg7a4dxJy8/9+4UYzE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from qiao.. (unknown [210.73.53.31]) by APP-01 (Coremail) with SMTP id qwCowAC3vUnmrqlmoLRaAg--.54511S2; Wed, 31 Jul 2024 11:26:36 +0800 (CST) From: Zhe Qiao To: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, alexghiti@rivosinc.com, surenb@google.com, akpm@linux-foundation.org, wangkefeng.wang@huawei.com, willy@infradead.org, qiaozhe@iscas.ac.cn Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] riscv/mm: Add handling for VM_FAULT_SIGSEGV in mm_fault_error() Date: Wed, 31 Jul 2024 11:26:27 +0800 Message-ID: <20240731032627.59696-1-qiaozhe@iscas.ac.cn> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qwCowAC3vUnmrqlmoLRaAg--.54511S2 X-Coremail-Antispam: 1UD129KBjvJXoW7WF4UZFyxZrW3AFy8CF4UJwb_yoW8GF15pF Wak3y2vrZ2grnayFZ2yr1UXa1rG3Z5tw1jk342kasY9r45ury5Gws5Aw4vg340qFy8XFy5 Ar4YyFyfuFWDuwUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBj14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWUuVWrJwAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r4j6ryUM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Cr 1j6rxdM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj 6xIIjxv20xvE14v26r126r1DMcIj6I8E87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr 0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E 8cxan2IY04v7MxkF7I0En4kS14v26r1q6r43MxkIecxEwVAFwVW8GwCF04k20xvY0x0EwI xGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480 Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7 IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k2 6cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxV AFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JU7GYJUUUUU= X-CM-SenderInfo: ptld061kh6x2xfdvhtffof0/ Content-Type: text/plain; charset="utf-8" Add processing for VM_CAULT_SIGSEGV to mm_fault_error () to avoid direct execution of BUG(). Fixes: 07037db5d479 ("RISC-V: Paging and MMU") Signed-off-by: Zhe Qiao Reviewed-by: Alexandre Ghiti --- arch/riscv/mm/fault.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index 5224f3733802..a9f2b4af8f3f 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -61,26 +61,27 @@ static inline void no_context(struct pt_regs *regs, uns= igned long addr) =20 static inline void mm_fault_error(struct pt_regs *regs, unsigned long addr= , vm_fault_t fault) { + if (!user_mode(regs)) { + no_context(regs, addr); + return; + } + if (fault & VM_FAULT_OOM) { /* * We ran out of memory, call the OOM killer, and return the userspace * (which will retry the fault, or kill us if we got oom-killed). */ - if (!user_mode(regs)) { - no_context(regs, addr); - return; - } pagefault_out_of_memory(); return; } else if (fault & (VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | VM_FAULT_HWPOIS= ON_LARGE)) { /* Kernel mode? Handle exceptions or die */ - if (!user_mode(regs)) { - no_context(regs, addr); - return; - } do_trap(regs, SIGBUS, BUS_ADRERR, addr); return; + } else if (fault & VM_FAULT_SIGSEGV) { + do_trap(regs, SIGSEGV, SEGV_MAPERR, addr); + return; } + BUG(); } =20 --=20 2.43.0