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Thu, 28 May 2026 23:55:17 -0700 (PDT) Received: from localhost.localdomain ([189.1.242.96]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-36bc6621745sm1121405a91.7.2026.05.28.23.55.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 May 2026 23:55:16 -0700 (PDT) From: Yiqi Sun To: catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, rmk+kernel@armlinux.org.uk, ruanjinjie@huawei.com, will@kernel.org, Yiqi Sun Subject: [PATCH] fix: arm64: syscall: use live x0 for syscall_get_arguments() arg0 Date: Fri, 29 May 2026 14:54:44 +0800 Message-Id: <20260529065444.1336608-1-sunyiqixm@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260528_235518_933710_5059D453 X-CRM114-Status: GOOD ( 12.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On arm64, seccomp obtains syscall arguments via syscall_get_arguments(), where arg0 is currently read from regs->orig_x0. However, the syscall wrapper consumes live arguments from regs->regs[0..5]. A ptracer can modify x0 on syscall-enter stop before seccomp runs, but cannot update orig_x0 through that interface. This can leave seccomp checking stale arg0 while the syscall executes with updated live x0, allowing seccomp bypass when filters depend on arg0. Make syscall_get_arguments() read arg0 from regs->regs[0], matching the actual dispatch arguments and removing this desynchronization. Fixes: f27bb139c387 ("arm64: Miscellaneous library functions") Signed-off-by: Yiqi Sun --- arch/arm64/include/asm/syscall.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h index 5e4c7fc44f73..4bdb4d3ce2b4 100644 --- a/arch/arm64/include/asm/syscall.h +++ b/arch/arm64/include/asm/syscall.h @@ -81,7 +81,7 @@ static inline void syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, unsigned long *args) { - args[0] = regs->orig_x0; + args[0] = regs->regs[0]; args[1] = regs->regs[1]; args[2] = regs->regs[2]; args[3] = regs->regs[3]; -- 2.34.1