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([2602:47:d490:6901:9454:a46f:1c22:a7c6]) by smtp.gmail.com with ESMTPSA id a5-20020a17090a740500b00262e604724dsm6306451pjg.50.2023.08.05.20.37.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Aug 2023 20:37:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1691293049; x=1691897849; 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=LDzaMFTSuoNmnLh18AUGiF2g+chM/kwaFDD4OLCcPrg=; b=Ca2j5s/BFtOLCUKfMdbZy1xHU1VLWsUnkcnOuRkHvZaJt10Ar/8c/CS7zIkznYQLUt wcvYKUbvv0fUXa/i144iNeKbhky3wX8vwoXl7D5oAdfh0MoGK7T9QMVkVHZUYapJOzlh TeP5TVAFjJ+bs1pihN4NyjOCmcB3+Os2VIbAABHuqntzP05B2YylYI4/qth57FO70yAR 9g3JQOtIdi/DTH3epXm4D3e/ptBlntamVnSdP8Z/l7gCmIVAzfC9LoIPXV9Mc8xCqUo0 GU4vpz61YxzYBKC8L3E1dAgCfQJnqUYHRLch292/gBcuAXX+uLykPzyHSunn8hAill3d mkVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691293049; x=1691897849; 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=LDzaMFTSuoNmnLh18AUGiF2g+chM/kwaFDD4OLCcPrg=; b=LOjQO4iVkgSmfb4rqJHlHjMfMsa345OHhV85dj4VsSnGC4fJB9oZ2VsWjZ4CQ5EMEl wSE2t+hvUTxeVX/dIOkCnHnLBlO/VWkwX6QOR8lqPq4vAPP0excRrZkhsjw9GwxHQRpJ zh+n0PFVSdB2/2K26efcOycG3D/HYUcoGg8QvxbXp3VDbdg9BlxmZNyWGvQO4Hct6R5O 1m+/EZOO5AYFx/2kisMjW0+P7gkr0fAbxQThYTroaBOPoDe4u86ewsv92Febhumc2R1t Ex/QR9A3Bu9tuTm5kXFC2hVrB+qTzdAXwM1HGi6aH0b9hLmCx8sCeP6LnBS1k4QjvbWw v9oQ== X-Gm-Message-State: AOJu0YwQETV7+LUjPIvAtJFg3h7vKqUxBfnLnpZF/EpkWm6dxOgna2xY D3pyQZidPGm29HberEyE7DtohaF5Bc+3gFa+AAg= X-Google-Smtp-Source: AGHT+IEDhvxkKXoK1HXBp0hZK4vlNH35HuIMqmZaRGT8RfD8ZIEpOGtQD1nhjvr0oaKPpiGybcgClQ== X-Received: by 2002:a17:90a:12cc:b0:267:7021:4e3c with SMTP id b12-20020a17090a12cc00b0026770214e3cmr6084202pjg.8.1691293049589; Sat, 05 Aug 2023 20:37:29 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: Helge Deller , Akihiko Odaki Subject: [PULL 16/24] linux-user: Use MAP_FIXED_NOREPLACE for initial image mmap Date: Sat, 5 Aug 2023 20:37:07 -0700 Message-Id: <20230806033715.244648-17-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230806033715.244648-1-richard.henderson@linaro.org> References: <20230806033715.244648-1-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::52a; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x52a.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 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: 1691293126797100001 Content-Type: text/plain; charset="utf-8" Use this as extra protection for the guest mapping over any qemu host mappings. Tested-by: Helge Deller Reviewed-by: Helge Deller Reviewed-by: Akihiko Odaki Signed-off-by: Richard Henderson --- 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