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([71.212.149.95]) by smtp.gmail.com with ESMTPSA id fv21-20020a17090b0e9500b002775281b9easm2130692pjb.50.2023.09.29.19.15.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Sep 2023 19:15:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1696040134; x=1696644934; darn=nongnu.org; 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=N6Gi1W2NSeoXsGrs8c4mvQh099VY+s2zRGNYCJyf/Qs=; b=zUi+DDIeqHCzcKhsnhdy1aAvNO/QWvGU865QF0nTz7gBSaFeGtLc7PNG/LXY1zcpUX FlHQnhXJBeAekfDZ/JGSLYCgJQDt6cEuZppluDkqIyyM5NzjR1ebEE1R3Pi8SrEaBMLI dm1m1iu2E+85+JHI7Ho5Nn4w8fAPYu72UqX5oE8qQH5BjglyorFcV42FDwwf0yTwwF6K B2n2pM7K9Bk2Yesu48ES3ps9APQU/afa6JljySiyzn3oH70HrhkazfgmyzHgqSIV2WvK a8K8vPnaRP5q1JnL4L/FPKb+sws/ou9JU9MWe7Zx4OhFEmu11QawCyGFpICT8Ngbq8t4 nQIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696040134; x=1696644934; 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=N6Gi1W2NSeoXsGrs8c4mvQh099VY+s2zRGNYCJyf/Qs=; b=jSFYXdJKmQy2g/ZTfFs9B+/k3Zn5FE9KjEpwZJ7VLvgfG1EcaWcsTr762OgsSlqQCd cPr10OFHaXrqbxtDjmdav1wmzne1mQWTz4Q+JmFp4iLuT6XxY4kngbWZ/SgUC2TOCcYO SJZu3doTuqqVdsv9dyEIf2lJzqMvwjcSTMnifLYPN3aLrf1fP8lyRksmurjmGGq1ZjyP 0fKCVsX45foSGCINVZqz7tMVamhCNsMRBtnalTCATZErgH+xJlRzsTfu115JztdtrFtr nedv076TdZXJV8avjNERZKckQPwk/kHDAiOlg98G+euAJWJ7qfyt2Yf3wpeqf+a8ZElT jN4Q== X-Gm-Message-State: AOJu0YyZyqQDk9J5R6TmmNPz7VA0qQV4UOtEdN4NEb6BygMSXkrrYdmQ J0Xkaxxk+q7PFvzdQsdg+MN4FMVSbDDtPxGrKdE= X-Google-Smtp-Source: AGHT+IFbcm3E0IJLvxCfXs7rkZDdZtowgTKpbaVMEzH6ZIABRQAv/eDgtzf5OnVnDad6gFaWAYfOhQ== X-Received: by 2002:a05:6a20:7f8a:b0:131:b3fa:eaaa with SMTP id d10-20020a056a207f8a00b00131b3faeaaamr7316302pzj.61.1696040134158; Fri, 29 Sep 2023 19:15:34 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: alex.bennee@linaro.org, laurent@vivier.eu, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v6 03/19] linux-user: Do not clobber bprm_buf swapping ehdr Date: Fri, 29 Sep 2023 19:15:13 -0700 Message-Id: <20230930021529.987950-4-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230930021529.987950-1-richard.henderson@linaro.org> References: <20230930021529.987950-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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::433; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x433.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: 1696040260090100001 Rearrange the allocation of storage for ehdr between load_elf_image and load_elf_binary. The same set of copies are done, but we don't modify bprm_buf, which will be important later. Reviewed-by: Alex Benn=C3=A9e Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Richard Henderson --- linux-user/elfload.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index db75cd4b33..e5c014611c 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -3164,16 +3164,17 @@ static bool parse_elf_properties(int image_fd, On return: INFO values will be filled in, as necessary or available. */ =20 static void load_elf_image(const char *image_name, int image_fd, - struct image_info *info, char **pinterp_name, + struct image_info *info, struct elfhdr *ehdr, + char **pinterp_name, char bprm_buf[BPRM_BUF_SIZE]) { - struct elfhdr *ehdr =3D (struct elfhdr *)bprm_buf; struct elf_phdr *phdr; abi_ulong load_addr, load_bias, loaddr, hiaddr, error; int i, retval, prot_exec; Error *err =3D NULL; =20 /* First of all, some simple consistency checks */ + memcpy(ehdr, bprm_buf, sizeof(*ehdr)); if (!elf_check_ident(ehdr)) { error_setg(&err, "Invalid ELF image for this architecture"); goto exit_errmsg; @@ -3488,6 +3489,7 @@ static void load_elf_image(const char *image_name, in= t image_fd, static void load_elf_interp(const char *filename, struct image_info *info, char bprm_buf[BPRM_BUF_SIZE]) { + struct elfhdr ehdr; int fd, retval; Error *err =3D NULL; =20 @@ -3509,7 +3511,7 @@ static void load_elf_interp(const char *filename, str= uct image_info *info, memset(bprm_buf + retval, 0, BPRM_BUF_SIZE - retval); } =20 - load_elf_image(filename, fd, info, NULL, bprm_buf); + load_elf_image(filename, fd, info, &ehdr, NULL, bprm_buf); } =20 static int symfind(const void *s0, const void *s1) @@ -3702,8 +3704,14 @@ uint32_t get_elf_eflags(int fd) =20 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info) { + /* + * We need a copy of the elf header for passing to create_elf_tables. + * We will have overwritten the original when we re-use bprm->buf + * while loading the interpreter. Allocate the storage for this now + * and let elf_load_image do any swapping that may be required. + */ + struct elfhdr ehdr; struct image_info interp_info; - struct elfhdr elf_ex; char *elf_interpreter =3D NULL; char *scratch; =20 @@ -3713,12 +3721,7 @@ int load_elf_binary(struct linux_binprm *bprm, struc= t image_info *info) #endif =20 load_elf_image(bprm->filename, bprm->fd, info, - &elf_interpreter, bprm->buf); - - /* ??? We need a copy of the elf header for passing to create_elf_tabl= es. - If we do nothing, we'll have overwritten this when we re-use bprm->= buf - when we load the interpreter. */ - elf_ex =3D *(struct elfhdr *)bprm->buf; + &ehdr, &elf_interpreter, bprm->buf); =20 /* Do this so that we can load the interpreter, if need be. We will change some of these later */ @@ -3805,7 +3808,7 @@ int load_elf_binary(struct linux_binprm *bprm, struct= image_info *info) target_mprotect(tramp_page, TARGET_PAGE_SIZE, PROT_READ | PROT_EXE= C); } =20 - bprm->p =3D create_elf_tables(bprm->p, bprm->argc, bprm->envc, &elf_ex, + bprm->p =3D create_elf_tables(bprm->p, bprm->argc, bprm->envc, &ehdr, info, (elf_interpreter ? &interp_info : NU= LL)); info->start_stack =3D bprm->p; =20 --=20 2.34.1