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[209.51.188.17]) by mx.google.com with ESMTPS id p9si4578400ybk.304.2020.08.12.23.51.38 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Wed, 12 Aug 2020 23:51:38 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org" Received: from localhost ([::1]:49932 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k675O-0000DR-Fu for patch@linaro.org; Thu, 13 Aug 2020 02:51:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60314) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k673Q-0006Qf-AF for qemu-devel@nongnu.org; Thu, 13 Aug 2020 02:49:36 -0400 Received: from mout.kundenserver.de ([217.72.192.75]:40691) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k673K-0004bz-88 for qemu-devel@nongnu.org; Thu, 13 Aug 2020 02:49:35 -0400 Received: from localhost.localdomain ([82.252.135.186]) by mrelayeu.kundenserver.de (mreue107 [212.227.15.183]) with ESMTPSA (Nemesis) id 1MxEcg-1kuWsR03WC-00xYAE; Thu, 13 Aug 2020 08:49:27 +0200 From: Laurent Vivier To: qemu-devel@nongnu.org Subject: [PULL 03/14] linux-user: Adjust guest page protection for the host Date: Thu, 13 Aug 2020 08:49:12 +0200 Message-Id: <20200813064923.263565-4-laurent@vivier.eu> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200813064923.263565-1-laurent@vivier.eu> References: <20200813064923.263565-1-laurent@vivier.eu> MIME-Version: 1.0 X-Provags-ID: V03:K1:dak7xG3V4W0QKLOhjASDpYW82SzC8Qlh7wh9zzOo5iPO3aBNtV9 Eqv/0+1EkMSD5+veXfO3ss+U+l4Nz2TXYnZY5zQEOaH/TgW47imod9zFmFtGsdQKXYqZH95 ZWZWZFLtkwR0Qpp/o6M0Nh0igovvtZIee8LmM0IwU0kXVcyPSwuATr/kzczqDyUN/j6YCI7 EtsTVsb/2Qfb0pQhcIqtw== X-UI-Out-Filterresults: notjunk:1; V03:K0:kFJa+kebwxI=:v3fkdMtEbWQdwcCMXgFwyP xaRgl9UMaOeqC3P+k5g5zEzixWLIL5AB1lk4R1FcVEv8F8yf3zv+vDkbzJnTXfaCvz1BGzT6i UGUN4UeW8h1itVEavw7RPrNmKTfZ1BGTRe51F1wxENbUHKSBZwyfKmMBjKMUAjT2WOe1At34c sEF8U+SNdfZDE/gtPvaXhA8D5crwo3N1YY5zyIx1KvQhsg8Eh9JbwQav1VsAbPMBIvn6GluBV ujyY9XlGgg6LR9XyzOrXhJsHbG+VRVVARxHYM1sIjl8q/Re7B3J0aq9GlcHxMbYoDKUqpOrf1 UGzM5/7QkPB4N6PWWzWEEoRcWRv5Y7hWEJxIeQnd3fegDkejPbsvOBnfdqv453xISFuhezNdh dAcWOCoMa71IfrRYEUPIe+KhlLkxewg3UUeCz9JbSQlRh75y3jLXnoY0tulIMaTfX5wCJADN/ LF3TcEl56g4ISmK8zbubnFQspU3yiX3T6k/cCZecRFHs8Lr2J2vp0NupRfLXb7fyJwPh2ZqSM 2LVtxHOVJ0JOKa4eGc0Y47eHLo8BHJ8hWXmXEx39owRoQr+u1KKrojcb7BBkElSNGNdA9L1oI cI6ttAzccfmTiXBsC+Q6swBDQwKkywg+abtFXUnO2RMtYqweRpKcqu61EpOceaeoGsroLU/OI De9ERNLEGTmWtvvnl3SnUIiwi1b2Fbi5IL1DC5+rnAbCmOIq6pw4QsvgFMYjuC6zXVKUlYNdc ZXD7Pzjs45x8KTOdtqMAUo3Gx8SjYLdqdNVesmlEFxaVfg4S/4OEFZQP2ebzxC34iSbUfT2y9 a71RPCsG0QPIzCngMeqCSsKxmhEytN5LoiJpkCV1SNWHBR6ASs8sRWAq++GLYId5zqa342v Received-SPF: none client-ip=217.72.192.75; envelope-from=laurent@vivier.eu; helo=mout.kundenserver.de X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/13 02:49:26 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Richard Henderson , Laurent Vivier , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?b?w6k=?= Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" From: Richard Henderson Executable guest pages are never directly executed by the host, but do need to be readable for translation. Signed-off-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Peter Maydell Message-Id: <20200519185645.3915-3-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier --- linux-user/mmap.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) -- 2.26.2 diff --git a/linux-user/mmap.c b/linux-user/mmap.c index 46c7eeba9bd2..f2615634201d 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -76,8 +76,12 @@ static int validate_prot_to_pageflags(int *host_prot, int prot) * don't bother transforming guest bit to host bit. Any other * target-specific prot bits will not be understood by the host * and will need to be encoded into page_flags for qemu emulation. + * + * Pages that are executable by the guest will never be executed + * by the host, but the host will need to be able to read them. */ - *host_prot = prot & (PROT_READ | PROT_WRITE | PROT_EXEC); + *host_prot = (prot & (PROT_READ | PROT_WRITE)) + | (prot & PROT_EXEC ? PROT_READ : 0); return prot & ~valid ? 0 : page_flags; }