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[209.51.188.17]) by mx.google.com with ESMTPS id e9si12300055qki.171.2021.07.06.16.54.46 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 06 Jul 2021 16:54:46 -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; dkim=fail header.i=@linaro.org header.s=google header.b=Rt26Tpjg; 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"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:53102 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m0utp-0003hL-RF for patch@linaro.org; Tue, 06 Jul 2021 19:54:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52936) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m0uow-0000qJ-Cb for qemu-devel@nongnu.org; Tue, 06 Jul 2021 19:49:42 -0400 Received: from mail-pf1-x436.google.com ([2607:f8b0:4864:20::436]:37759) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1m0uos-0006bV-LF for qemu-devel@nongnu.org; Tue, 06 Jul 2021 19:49:42 -0400 Received: by mail-pf1-x436.google.com with SMTP id 17so547112pfz.4 for ; Tue, 06 Jul 2021 16:49:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=VISwacrGgGbOWnBpiQJcNPBiBKqXw/P+V8RdFMkfOQg=; b=Rt26TpjgEzcf6YNhaAjOb3NqFq7WoADgLBCxA6qj97rRaw1pakmpDtUcFofdqb6u30 Wp9XBeYbwfKnxcQ55NPZ+DNSxOC4P+SOjY+WLVHMeAconTf7+XqQv2jQkjii3Ur9oSEg Y7D5e+RbrcpOpUuGqh8bxaSsukJfdjFSoceslNkz0bU3MW476oqAM0qa5LuSNz2UA+0w Dfd/nVOi/CpIT/EZ/5GZALezH+ERBt/tGfXrs/iGRYt4y52dTn13XGZ1X+nvDzyA0GAc X30EPjv62ZJpgi8QSCx8K6gNSq+4rfzYTUz9/IE0Byhpe6Oy0tgzabd3VdyCh+mPNupE fUmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=VISwacrGgGbOWnBpiQJcNPBiBKqXw/P+V8RdFMkfOQg=; b=SPZwqgcByK3YEhv22UMy3AXV2p3CbyjOLQ2dQ8diOif4/A1MYUWHG2gzaWUhY63qr5 6U853cbuFxTkKvYA4VtX2OnQRxZ/qWHvF7Lq0/7Jj2NYgt8cXQZYmi8yxXTdx8DArgFq HmQVo21qFQ/+pYZXXSOjsF0cVPG+PHQu0mATN9iLkbLX7W+7M3MaguaUKTVwhSVXrQiv bLCBUtwqcKpgajQgEIilKYLNnO+WiJvegIB0jXikI+ZA1zJaQ7hTCh5ZiAFmLqyS11ez Ry4ZifmLso43OKRj1Xvnm03gOFnXQdQoj52VrGuUwc6OzmMM09SqOneF3q6bUrI9FNd+ XHSg== X-Gm-Message-State: AOAM533KLnxHDRTi96DlyzwBGFkeArWQr5U8agE6Myg0fe8FZrySfvjB MBKNkKGMUIb2uvNI3RAgZnyojhNSTaSPBA== X-Received: by 2002:a62:7e42:0:b029:325:6b42:609f with SMTP id z63-20020a627e420000b02903256b42609fmr1104719pfc.37.1625615377383; Tue, 06 Jul 2021 16:49:37 -0700 (PDT) Received: from localhost.localdomain ([71.212.149.176]) by smtp.gmail.com with ESMTPSA id b3sm18058114pfi.179.2021.07.06.16.49.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jul 2021 16:49:37 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 06/36] linux-user: Use ImageSource in load_elf_image Date: Tue, 6 Jul 2021 16:49:02 -0700 Message-Id: <20210706234932.356913-7-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210706234932.356913-1-richard.henderson@linaro.org> References: <20210706234932.356913-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::436; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x436.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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alex.bennee@linaro.org, laurent@vivier.eu Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" Change parse_elf_properties as well, as the bprm_buf argument ties the two functions closely. Signed-off-by: Richard Henderson --- linux-user/elfload.c | 124 ++++++++++++++++--------------------------- 1 file changed, 47 insertions(+), 77 deletions(-) -- 2.25.1 diff --git a/linux-user/elfload.c b/linux-user/elfload.c index d1278c2d29..9113bf82f1 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -2530,10 +2530,9 @@ static bool parse_elf_property(const uint32_t *data, int *off, int datasz, } /* Process NT_GNU_PROPERTY_TYPE_0. */ -static bool parse_elf_properties(int image_fd, +static bool parse_elf_properties(const ImageSource *src, struct image_info *info, const struct elf_phdr *phdr, - char bprm_buf[BPRM_BUF_SIZE], Error **errp) { union { @@ -2561,14 +2560,8 @@ static bool parse_elf_properties(int image_fd, return false; } - if (phdr->p_offset + n <= BPRM_BUF_SIZE) { - memcpy(¬e, bprm_buf + phdr->p_offset, n); - } else { - ssize_t len = pread(image_fd, ¬e, n, phdr->p_offset); - if (len != n) { - error_setg_errno(errp, errno, "Error reading file header"); - return false; - } + if (!imgsrc_read(¬e, phdr->p_offset, n, src, errp)) { + return false; } /* @@ -2614,30 +2607,34 @@ static bool parse_elf_properties(int image_fd, } } -/* Load an ELF image into the address space. +/** + * load_elf_image: Load an ELF image into the address space. + * @image_name: the filename of the image, to use in error messages. + * @src: the ImageSource from which to read. + * @info: info collected from the loaded image. + * @ehdr: the ELF header, not yet bswapped. + * @pinterp_name: record any PT_INTERP string found. + * + * On return: @info values will be filled in, as necessary or available. + */ - IMAGE_NAME is the filename of the image, to use in error messages. - IMAGE_FD is the open file descriptor for the image. - - BPRM_BUF is a copy of the beginning of the file; this of course - contains the elf file header at offset 0. It is assumed that this - buffer is sufficiently aligned to present no problems to the host - in accessing data at aligned offsets within the buffer. - - On return: INFO values will be filled in, as necessary or available. */ - -static void load_elf_image(const char *image_name, int image_fd, +static void load_elf_image(const char *image_name, const ImageSource *src, struct image_info *info, struct elfhdr *ehdr, - char **pinterp_name, - char bprm_buf[BPRM_BUF_SIZE]) + char **pinterp_name) { - struct elf_phdr *phdr; + g_autofree struct elf_phdr *phdr = NULL; abi_ulong load_addr, load_bias, loaddr, hiaddr, error; - int i, retval, prot_exec; + int i, prot_exec; Error *err = NULL; - /* First of all, some simple consistency checks */ - memcpy(ehdr, bprm_buf, sizeof(*ehdr)); + /* + * First of all, some simple consistency checks. + * Note that we rely on the bswapped ehdr staying in bprm_buf, + * for later use by load_elf_binary and create_elf_tables. + */ + if (!imgsrc_read(ehdr, 0, sizeof(*ehdr), src, &err)) { + goto exit_errmsg; + } if (!elf_check_ident(ehdr)) { error_setg(&err, "Invalid ELF image for this architecture"); goto exit_errmsg; @@ -2648,15 +2645,11 @@ static void load_elf_image(const char *image_name, int image_fd, goto exit_errmsg; } - i = ehdr->e_phnum * sizeof(struct elf_phdr); - if (ehdr->e_phoff + i <= BPRM_BUF_SIZE) { - phdr = (struct elf_phdr *)(bprm_buf + ehdr->e_phoff); - } else { - phdr = (struct elf_phdr *) alloca(i); - retval = pread(image_fd, phdr, i, ehdr->e_phoff); - if (retval != i) { - goto exit_read; - } + phdr = imgsrc_read_alloc(ehdr->e_phoff, + ehdr->e_phnum * sizeof(struct elf_phdr), + src, &err); + if (phdr == NULL) { + goto exit_errmsg; } bswap_phdr(phdr, ehdr->e_phnum); @@ -2692,17 +2685,10 @@ static void load_elf_image(const char *image_name, int image_fd, goto exit_errmsg; } - interp_name = g_malloc(eppnt->p_filesz); - - if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) { - memcpy(interp_name, bprm_buf + eppnt->p_offset, - eppnt->p_filesz); - } else { - retval = pread(image_fd, interp_name, eppnt->p_filesz, - eppnt->p_offset); - if (retval != eppnt->p_filesz) { - goto exit_read; - } + interp_name = imgsrc_read_alloc(eppnt->p_offset, eppnt->p_filesz, + src, &err); + if (interp_name == NULL) { + goto exit_errmsg; } if (interp_name[eppnt->p_filesz - 1] != 0) { error_setg(&err, "Invalid PT_INTERP entry"); @@ -2710,7 +2696,7 @@ static void load_elf_image(const char *image_name, int image_fd, } *pinterp_name = g_steal_pointer(&interp_name); } else if (eppnt->p_type == PT_GNU_PROPERTY) { - if (!parse_elf_properties(image_fd, info, eppnt, bprm_buf, &err)) { + if (!parse_elf_properties(src, info, eppnt, &err)) { goto exit_errmsg; } } @@ -2852,7 +2838,7 @@ static void load_elf_image(const char *image_name, int image_fd, vaddr_len = TARGET_ELF_PAGELENGTH(eppnt->p_filesz + vaddr_po); error = target_mmap(vaddr_ps, vaddr_len, elf_prot, MAP_PRIVATE | MAP_FIXED, - image_fd, eppnt->p_offset - vaddr_po); + src->fd, eppnt->p_offset - vaddr_po); if (error == -1) { goto exit_mmap; @@ -2898,20 +2884,11 @@ static void load_elf_image(const char *image_name, int image_fd, #ifdef TARGET_MIPS } else if (eppnt->p_type == PT_MIPS_ABIFLAGS) { Mips_elf_abiflags_v0 abiflags; - if (eppnt->p_filesz < sizeof(Mips_elf_abiflags_v0)) { - error_setg(&err, "Invalid PT_MIPS_ABIFLAGS entry"); + + if (!imgsrc_read(&abiflags, eppnt->p_offset, sizeof(abiflags), + src, &err)) { goto exit_errmsg; } - if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) { - memcpy(&abiflags, bprm_buf + eppnt->p_offset, - sizeof(Mips_elf_abiflags_v0)); - } else { - retval = pread(image_fd, &abiflags, sizeof(Mips_elf_abiflags_v0), - eppnt->p_offset); - if (retval != sizeof(Mips_elf_abiflags_v0)) { - goto exit_read; - } - } bswap_mips_abiflags(&abiflags); info->fp_abi = abiflags.fp_abi; #endif @@ -2924,21 +2901,14 @@ static void load_elf_image(const char *image_name, int image_fd, } if (qemu_log_enabled()) { - load_symbols(ehdr, image_fd, load_bias); + load_symbols(ehdr, src->fd, load_bias); } mmap_unlock(); - close(image_fd); + close(src->fd); return; - exit_read: - if (retval >= 0) { - error_setg(&err, "Incomplete read of file header"); - } else { - error_setg_errno(&err, errno, "Error reading file header"); - } - goto exit_errmsg; exit_mmap: error_setg_errno(&err, errno, "Error mapping file"); goto exit_errmsg; @@ -2951,6 +2921,7 @@ static void load_elf_interp(const char *filename, struct image_info *info, char bprm_buf[BPRM_BUF_SIZE]) { struct elfhdr ehdr; + ImageSource src; int fd, retval; Error *err = NULL; @@ -2968,11 +2939,11 @@ static void load_elf_interp(const char *filename, struct image_info *info, exit(-1); } - if (retval < BPRM_BUF_SIZE) { - memset(bprm_buf + retval, 0, BPRM_BUF_SIZE - retval); - } + src.fd = fd; + src.cache = bprm_buf; + src.cache_size = retval; - load_elf_image(filename, fd, info, &ehdr, NULL, bprm_buf); + load_elf_image(filename, &src, info, &ehdr, NULL); } static int symfind(const void *s0, const void *s1) @@ -3182,8 +3153,7 @@ int load_elf_binary(struct linux_binprm *bprm, struct image_info *info) info->start_mmap = (abi_ulong)ELF_START_MMAP; - load_elf_image(bprm->filename, bprm->fd, info, - &ehdr, &elf_interpreter, bprm->buf); + load_elf_image(bprm->filename, &bprm->src, info, &ehdr, &elf_interpreter); /* Do this so that we can load the interpreter, if need be. We will change some of these later */