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Message-Id: <20230929032435.2391507-2-keescook@chromium.org> Date: Thu, 28 Sep 2023 20:24:30 -0700 From: Kees Cook <keescook@...omium.org> To: Eric Biederman <ebiederm@...ssion.com> Cc: Kees Cook <keescook@...omium.org>, Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, Sebastian Ott <sebott@...hat.com>, Thomas Weißschuh <linux@...ssschuh.net>, Pedro Falcato <pedro.falcato@...il.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH v4 2/6] binfmt_elf: elf_bss no longer used by load_elf_binary() With the BSS handled generically via the new filesz/memsz mismatch handling logic in elf_load(), elf_bss no longer needs to be tracked. Drop the variable. Cc: Eric Biederman <ebiederm@...ssion.com> Cc: Alexander Viro <viro@...iv.linux.org.uk> Cc: Christian Brauner <brauner@...nel.org> Cc: linux-fsdevel@...r.kernel.org Cc: linux-mm@...ck.org Suggested-by: Eric Biederman <ebiederm@...ssion.com> Signed-off-by: Kees Cook <keescook@...omium.org> --- fs/binfmt_elf.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 2a615f476e44..0214d5a949fc 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -854,7 +854,7 @@ static int load_elf_binary(struct linux_binprm *bprm) unsigned long error; struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL; struct elf_phdr *elf_property_phdata = NULL; - unsigned long elf_bss, elf_brk; + unsigned long elf_brk; int retval, i; unsigned long elf_entry; unsigned long e_entry; @@ -1045,7 +1045,6 @@ static int load_elf_binary(struct linux_binprm *bprm) if (retval < 0) goto out_free_dentry; - elf_bss = 0; elf_brk = 0; start_code = ~0UL; @@ -1208,8 +1207,6 @@ static int load_elf_binary(struct linux_binprm *bprm) k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; - if (k > elf_bss) - elf_bss = k; if ((elf_ppnt->p_flags & PF_X) && end_code < k) end_code = k; if (end_data < k) @@ -1221,7 +1218,6 @@ static int load_elf_binary(struct linux_binprm *bprm) e_entry = elf_ex->e_entry + load_bias; phdr_addr += load_bias; - elf_bss += load_bias; elf_brk += load_bias; start_code += load_bias; end_code += load_bias; -- 2.34.1
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