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([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-73dbf8e13e1sm8850825b3a.46.2025.04.22.09.23.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Apr 2025 09:24:05 -0700 (PDT) From: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= To: linux-doc@vger.kernel.org (open list:DOCUMENTATION), linux-kernel@vger.kernel.org (open list), linux-riscv@lists.infradead.org (open list:RISC-V ARCHITECTURE), linux-kselftest@vger.kernel.org (open list:KERNEL SELFTEST FRAMEWORK) Cc: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= , Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Shuah Khan , Andrew Jones , Samuel Holland Subject: [PATCH v2 2/5] riscv: misaligned: enable IRQs while handling misaligned accesses Date: Tue, 22 Apr 2025 18:23:09 +0200 Message-ID: <20250422162324.956065-3-cleger@rivosinc.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250422162324.956065-1-cleger@rivosinc.com> References: <20250422162324.956065-1-cleger@rivosinc.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 We can safely reenable IRQs if coming from userspace. This allows to access user memory that could potentially trigger a page fault. Fixes: b686ecdeacf6 ("riscv: misaligned: Restrict user access to kernel memory") Signed-off-by: Clément Léger --- arch/riscv/kernel/traps.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index b1d991c78a23..9c83848797a7 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -220,19 +220,23 @@ static void do_trap_misaligned(struct pt_regs *regs, enum misaligned_access_type { irqentry_state_t state; - if (user_mode(regs)) + if (user_mode(regs)) { irqentry_enter_from_user_mode(regs); - else + local_irq_enable(); + } else { state = irqentry_nmi_enter(regs); + } if (misaligned_handler[type].handler(regs)) do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, misaligned_handler[type].type_str); - if (user_mode(regs)) + if (user_mode(regs)) { + local_irq_disable(); irqentry_exit_to_user_mode(regs); - else + } else { irqentry_nmi_exit(regs, state); + } } asmlinkage __visible __trap_section void do_trap_load_misaligned(struct pt_regs *regs) From patchwork Tue Apr 22 16:23:11 2025 Content-Type: text/plain; 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([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-73dbf8e13e1sm8850825b3a.46.2025.04.22.09.24.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Apr 2025 09:24:22 -0700 (PDT) From: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= To: linux-doc@vger.kernel.org (open list:DOCUMENTATION), linux-kernel@vger.kernel.org (open list), linux-riscv@lists.infradead.org (open list:RISC-V ARCHITECTURE), linux-kselftest@vger.kernel.org (open list:KERNEL SELFTEST FRAMEWORK) Cc: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= , Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Shuah Khan , Andrew Jones , Samuel Holland , Alexandre Ghiti Subject: [PATCH v2 4/5] Documentation/sysctl: add riscv to unaligned-trap supported archs Date: Tue, 22 Apr 2025 18:23:11 +0200 Message-ID: <20250422162324.956065-5-cleger@rivosinc.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250422162324.956065-1-cleger@rivosinc.com> References: <20250422162324.956065-1-cleger@rivosinc.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 riscv supports the "unaligned-trap" sysctl variable, add it to the list of supported architectures. Signed-off-by: Clément Léger Reviewed-by: Alexandre Ghiti --- Documentation/admin-guide/sysctl/kernel.rst | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index dd49a89a62d3..a38e91c4d92c 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -1595,8 +1595,8 @@ unaligned-trap On architectures where unaligned accesses cause traps, and where this feature is supported (``CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW``; currently, -``arc``, ``parisc`` and ``loongarch``), controls whether unaligned traps -are caught and emulated (instead of failing). +``arc``, ``parisc``, ``loongarch`` and ``riscv``), controls whether unaligned +traps are caught and emulated (instead of failing). = ======================================================== 0 Do not emulate unaligned accesses.