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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=OMV7GU+CS755gzThihulnjNw1pxqVtHrVsdKKTavPQY=; b=k0hQK/nx/D/ShVRRS5cnzOAY1tolJMn4YWDmiCmaQcQ56JLAY5Cw4bYrVeee7q7dsm NHrWo3KOiLr/Zs+/Xm6QscP6lSfngYiouEXnZ4mZHiGFjACYZ2Dd3jqqES/dqrZE/ee6 ANQ+Mg4PDkpedbGPgE5zmrHVhjKwSF3kbRAwEkqiATKgNTeWqjI+uuuHK1BeFv1lKNzq LHEkeiOYX9oWsoxXg1krvceR+XEUDtrM66Kiakb88hNPzXHOrp+HXdvFCGnGSwvBYQwZ wgKKQNTcW47eCBUQKBPMYtgBpVh8xxZiEjTWyDKqOqAscxuHNplUny5tNoQ/5Awl1CdD IcLA== X-Gm-Message-State: APjAAAX8Bzfo+iGm21Z1qqmHF4gvY5Z0+nQky1H8TA7sHwLK5XJiLuxM VtTxRbTcLDt+Tb3e7M+8+CgmFnnsPG2s0BGzZCY= X-Google-Smtp-Source: APXvYqycxw3zlWpqg/6yGEhb7CgOxW1rmJc0Y43aPOFAV6KRrpZHK92ZxBUvHsBpIOsv4SiMThIv0qzjvIsHF4JRnyI= X-Received: by 2002:a63:1904:: with SMTP id z4mr11066720pgl.413.1571415085386; Fri, 18 Oct 2019 09:11:25 -0700 (PDT) Date: Fri, 18 Oct 2019 09:10:29 -0700 In-Reply-To: <20191018161033.261971-1-samitolvanen@google.com> Message-Id: <20191018161033.261971-15-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> X-Mailer: git-send-email 2.23.0.866.gb869b98d4c-goog Subject: [PATCH 14/18] arm64: efi: restore x18 if it was corrupted From: Sami Tolvanen To: Will Deacon , Catalin Marinas , Steven Rostedt , Ard Biesheuvel X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191018_091127_815578_E331679C X-CRM114-Status: UNSURE ( 8.81 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Kees Cook , kernel-hardening@lists.openwall.com, Nick Desaulniers , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Sami Tolvanen , Laura Abbott , Dave Martin , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org If we detect a corrupted x18 and SCS is enabled, restore the register before jumping back to instrumented code. Signed-off-by: Sami Tolvanen --- arch/arm64/kernel/efi-rt-wrapper.S | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/efi-rt-wrapper.S b/arch/arm64/kernel/efi-rt-wrapper.S index 3fc71106cb2b..945744f16086 100644 --- a/arch/arm64/kernel/efi-rt-wrapper.S +++ b/arch/arm64/kernel/efi-rt-wrapper.S @@ -34,5 +34,10 @@ ENTRY(__efi_rt_asm_wrapper) ldp x29, x30, [sp], #32 b.ne 0f ret -0: b efi_handle_corrupted_x18 // tail call +0: +#ifdef CONFIG_SHADOW_CALL_STACK + /* Restore x18 before returning to instrumented code. */ + mov x18, x2 +#endif + b efi_handle_corrupted_x18 // tail call ENDPROC(__efi_rt_asm_wrapper) -- 2.23.0.866.gb869b98d4c-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel