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[24.120.228.34]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e9f3894192sm9860a91.21.2024.11.12.12.38.01 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Nov 2024 12:38:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1731443882; x=1732048682; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=u0kRCYJEdfCPc7Ck3L3jOULPW0HIyB/R3/8bipse23E=; b=hsZ7sJHeYTDFO5O0gJTT/maZgWLqsyBpBvHS7VWGMf7Qsh/UqejeY2Wi+whOpCjKtL pWQ7x63oAQ/SjLxRpPrY78o4FSv7XeNj1bsqHULyhnYhxeXn5d3GV59X14iYnlELu127 1qic6BRDFNU4J2A4O8x7ntvrNo0dMEUQzx487xkO3ZoNUZZcT7l/Sy3C2Z4bd48Eqbhz sksMNffpjdkLxX2AIzqlAQI0e5Z2rrbkaRPs/sXOi1KO78U0jxu0KmtZ/jQ3okHbgJ78 9qA3aYAsfB1/K5sM6f0Kr8G62ZxkxL+MXQHdj4lj/e/fqL+Qg2vxQ3RPtsJJHQFi+5WQ 48GQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731443882; x=1732048682; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=u0kRCYJEdfCPc7Ck3L3jOULPW0HIyB/R3/8bipse23E=; b=UwvZ6aPZctHcSrRLIvs3mGcDXn4VQnNjSGmKF2TNGkKN6xnzfR5B9PTLD9knCtbER0 X1SEMvnE+A8lrFhk2K9Gr0L2gXWm44WCv9ybbYxTBhOgubcxuxG0M82Dn8u2+VFQYKf5 bsAxPor3Q98MTKNJD1eUn0WJ5mDQadrT4bn4EDFsvo1Y/BuUTSufcCmMHiBpc8SLaUpe qhB8WrAqybP48ZSIGKrk9LqELDwtxrz1pxFWLXo3oy0Z4GszWdnBIEacWmH2CHH0S/5W 8I2mp+zWD/KApzp7b7vTsGyw9v0P2wF0x2HuW0za3akvJBbSSsjtOTqANEvc3PDo7hz8 nk9g== X-Gm-Message-State: AOJu0YwY427oIDzMJiUBEXmM3/695m8THzcalD5X4jW+ZBRY0ON3yclp 6vXgwjkr/e99sJUq56fZqGFmoe23WfGm0MdVGlhG2wXPCsaUMsRZsSJ+J7Lrln7Ntk3w84/O1vq 1 X-Google-Smtp-Source: AGHT+IG+PusSF65DKFR2hLTKOhjc526pPP5zmfyLBEsSjciTtt65OE8TEDaqJ3a622vtVtknClVFHw== X-Received: by 2002:a17:90b:1b46:b0:2e0:9d3e:bc2a with SMTP id 98e67ed59e1d1-2e9b1784258mr21335772a91.32.1731443882158; Tue, 12 Nov 2024 12:38:02 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 1/6] linux-user: Honor elf alignment when placing images Date: Tue, 12 Nov 2024 12:37:52 -0800 Message-ID: <20241112203757.804320-2-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241112203757.804320-1-richard.henderson@linaro.org> References: <20241112203757.804320-1-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::102d; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x102d.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: 1731443999453116600 Content-Type: text/plain; charset="utf-8" Most binaries don't actually depend on more than page alignment, but any binary can request it. Not honoring this was a bug. This became obvious when gdb reported Failed to read a valid object file image from memory when examining some vdso which are marked as needing more than page alignment. Signed-off-by: Richard Henderson --- linux-user/elfload.c | 35 ++++++++++++++++++++++++++++------- 1 file changed, 28 insertions(+), 7 deletions(-) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index d6ad77d27d..90e79a01b4 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -3179,7 +3179,8 @@ static void load_elf_image(const char *image_name, co= nst ImageSource *src, char **pinterp_name) { g_autofree struct elf_phdr *phdr =3D NULL; - abi_ulong load_addr, load_bias, loaddr, hiaddr, error; + abi_ulong load_addr, load_bias, loaddr, hiaddr, error, align; + size_t reserve_size, align_size; int i, prot_exec; Error *err =3D NULL; =20 @@ -3263,6 +3264,9 @@ static void load_elf_image(const char *image_name, co= nst ImageSource *src, =20 load_addr =3D loaddr; =20 + align =3D pow2ceil(info->alignment); + info->alignment =3D align; + if (pinterp_name !=3D NULL) { if (ehdr->e_type =3D=3D ET_EXEC) { /* @@ -3271,8 +3275,6 @@ static void load_elf_image(const char *image_name, co= nst ImageSource *src, */ probe_guest_base(image_name, loaddr, hiaddr); } else { - abi_ulong align; - /* * The binary is dynamic, but we still need to * select guest_base. In this case we pass a size. @@ -3290,10 +3292,7 @@ static void load_elf_image(const char *image_name, c= onst ImageSource *src, * Since we do not have complete control over the guest * address space, we prefer the kernel to choose some address * rather than force the use of LOAD_ADDR via MAP_FIXED. - * But without MAP_FIXED we cannot guarantee alignment, - * only suggest it. */ - align =3D pow2ceil(info->alignment); if (align) { load_addr &=3D -align; } @@ -3317,13 +3316,35 @@ static void load_elf_image(const char *image_name, = const ImageSource *src, * In both cases, we will overwrite pages in this range with mappings * from the executable. */ - load_addr =3D target_mmap(load_addr, (size_t)hiaddr - loaddr + 1, PROT= _NONE, + reserve_size =3D (size_t)hiaddr - loaddr + 1; + align_size =3D reserve_size; + + if (ehdr->e_type !=3D ET_EXEC && align > qemu_real_host_page_size()) { + align_size +=3D align - 1; + } + + load_addr =3D target_mmap(load_addr, align_size, PROT_NONE, MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | (ehdr->e_type =3D=3D ET_EXEC ? MAP_FIXED_NOREP= LACE : 0), -1, 0); if (load_addr =3D=3D -1) { goto exit_mmap; } + + if (align_size !=3D reserve_size) { + abi_ulong align_addr =3D ROUND_UP(load_addr, align); + abi_ulong align_end =3D align_addr + reserve_size; + abi_ulong load_end =3D load_addr + align_size; + + if (align_addr !=3D load_addr) { + target_munmap(load_addr, align_addr - load_addr); + } + if (align_end !=3D load_end) { + target_munmap(align_end, load_end - align_end); + } + load_addr =3D align_addr; + } + load_bias =3D load_addr - loaddr; =20 if (elf_is_fdpic(ehdr)) { --=20 2.43.0