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([2602:47:d490:6901:9d52:4fe8:10ce:5c3]) by smtp.gmail.com with ESMTPSA id c5-20020aa78c05000000b0066f37665a63sm456138pfd.73.2023.08.03.18.45.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Aug 2023 18:45:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1691113527; x=1691718327; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=FxH9JelEzWgR3VpEL1pKK9zkkgodDw/Fd0rqiGsNBAw=; b=neI4/4mvMMR0VnMfQV0bAnJSbvlGD+LsbynocbJ03KmUnK2t3ydsOfZwYkqLUzhR0N lEPD3XzPUpVAaeIePwDi1AuQh3PXEUUGnUo8blipjwM4h2XM6gZPAuIKVjGWuNmzm4U1 bLZtawp/gktRad9YLFzNGPLs0d91r+1hfAgNiDw525wWCIWccWGM4o7MS7sKeRePS4n+ IBJy0CrYkA4RxLVL0yjaXXjiECXMSDBKzcDZVVz4ivdklZZI8IG5gnu1WqZWWyu+CTE6 GE0o7o3VoZjnkmVPRcZtL9Noea/I/XpwqM3bUnxL8YJZJzHQRAxgMotHHr2JoHGeOZL5 MofA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691113527; x=1691718327; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=FxH9JelEzWgR3VpEL1pKK9zkkgodDw/Fd0rqiGsNBAw=; b=GGDWEtAukcOUuRuosfuKvfw+oRvam9wRKZQpFHiiFbpz1MedS7Uq0E1Qf31iF6rgmB 7GOD/VNLK6q+BRSjM2/OwgB0k5Z05J3xZAP4lHtwDi+kSNMITXS7iAE/Zk/cUWerDGEd 8YPqBPd88McWtXkBCl6yyO8SpRIuAmhbTFLZ5KqkS5yamguchU8qf4gGCx886jgNFt42 G1KIY3LwQykec3SNvbraMoKqRL03YEQoejA24RvfNa/cpz9s++R3XYXeHuEcPIwHlVMB NbwiGAUkKst7XaGo0pAZD+ohK/lo6NODyzs97qOIBtvDaSYw7Mi1sPr3vH0A7XoR6UEi ALJA== X-Gm-Message-State: AOJu0YwxUSX6Fjhqc8+INfTRDwP0sn3Jhf1HV34I37CFx6/O4d/D49Kq RmoMT2ZePvLtoQdR//e5LjCKQTYMHtS9WEAfRtY= X-Google-Smtp-Source: AGHT+IGLwzNiAO/hoJx0cFbfO3SbuNerJ6Sh1KqVhAYZGbSwvURRgop6JiS3BxE+xjyXU9cpuRTd3w== X-Received: by 2002:a05:6a21:7795:b0:126:a80d:4960 with SMTP id bd21-20020a056a21779500b00126a80d4960mr316688pzc.30.1691113527293; Thu, 03 Aug 2023 18:45:27 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: joel@jms.id.au, akihiko.odaki@daynix.com, laurent@vivier.eu, deller@gmx.de Subject: [PATCH v8 11/17] linux-user: Use MAP_FIXED_NOREPLACE for initial image mmap Date: Thu, 3 Aug 2023 18:45:11 -0700 Message-Id: <20230804014517.6361-12-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230804014517.6361-1-richard.henderson@linaro.org> References: <20230804014517.6361-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::435; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x435.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1691113637688100005 Content-Type: text/plain; charset="utf-8" Use this as extra protection for the guest mapping over any qemu host mappings. Signed-off-by: Richard Henderson Reviewed-by: Akihiko Odaki Reviewed-by: Helge Deller --- linux-user/elfload.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index 2aee2298ec..0c64aad8a5 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -3146,8 +3146,11 @@ static void load_elf_image(const char *image_name, i= nt image_fd, /* * Reserve address space for all of this. * - * In the case of ET_EXEC, we supply MAP_FIXED so that we get - * exactly the address range that is required. + * In the case of ET_EXEC, we supply MAP_FIXED_NOREPLACE so that we get + * exactly the address range that is required. Without reserved_va, + * the guest address space is not isolated. We have attempted to avoid + * conflict with the host program itself via probe_guest_base, but usi= ng + * MAP_FIXED_NOREPLACE instead of MAP_FIXED provides an extra check. * * Otherwise this is ET_DYN, and we are searching for a location * that can hold the memory space required. If the image is @@ -3159,7 +3162,7 @@ static void load_elf_image(const char *image_name, in= t image_fd, */ load_addr =3D target_mmap(loaddr, (size_t)hiaddr - loaddr + 1, PROT_NO= NE, MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | - (ehdr->e_type =3D=3D ET_EXEC ? MAP_FIXED : 0), + (ehdr->e_type =3D=3D ET_EXEC ? MAP_FIXED_NOREP= LACE : 0), -1, 0); if (load_addr =3D=3D -1) { goto exit_mmap; --=20 2.34.1