Message ID | ff66d290deda6313f175c9462a29054c58e8414a.1562908075.git.viresh.kumar@linaro.org (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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Thu, 11 Jul 2019 22:29:17 -0700 (PDT) From: Viresh Kumar <viresh.kumar@linaro.org> To: stable@vger.kernel.org, Julien Thierry <Julien.Thierry@arm.com> Subject: [PATCH v4.4 V2 07/43] arm64: uaccess: Prevent speculative use of the current addr_limit Date: Fri, 12 Jul 2019 10:57:55 +0530 Message-Id: <ff66d290deda6313f175c9462a29054c58e8414a.1562908075.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 2.21.0.rc0.269.g1a574e7a288b In-Reply-To: <cover.1562908074.git.viresh.kumar@linaro.org> References: <cover.1562908074.git.viresh.kumar@linaro.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190711_222919_361929_EB42E972 X-CRM114-Status: GOOD ( 10.69 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: <linux-arm-kernel.lists.infradead.org> List-Unsubscribe: <http://lists.infradead.org/mailman/options/linux-arm-kernel>, <mailto:linux-arm-kernel-request@lists.infradead.org?subject=unsubscribe> List-Archive: <http://lists.infradead.org/pipermail/linux-arm-kernel/> List-Post: <mailto:linux-arm-kernel@lists.infradead.org> List-Help: <mailto:linux-arm-kernel-request@lists.infradead.org?subject=help> List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-arm-kernel>, <mailto:linux-arm-kernel-request@lists.infradead.org?subject=subscribe> Cc: Mark Rutland <mark.rutland@arm.com>, Marc Zyngier <marc.zyngier@arm.com>, Viresh Kumar <viresh.kumar@linaro.org>, Will Deacon <will.deacon@arm.com>, mark.brown@arm.com, Catalin Marinas <catalin.marinas@arm.com>, Russell King <rmk+kernel@arm.linux.org.uk>, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; 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Series |
V4.4 backport of arm64 Spectre patches
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diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 75363d723262..fc11c50af558 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -62,6 +62,13 @@ extern int fixup_exception(struct pt_regs *regs); static inline void set_fs(mm_segment_t fs) { current_thread_info()->addr_limit = fs; + + /* + * Prevent a mispredicted conditional call to set_fs from forwarding + * the wrong address limit to access_ok under speculation. + */ + dsb(nsh); + isb(); } #define segment_eq(a, b) ((a) == (b))