[PATCH v3 2/4] binfmt_elf: elf_bss no longer used by load_elf_binary()

[Kees Cook]

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 <ebied...@xmission.com>
Cc: Alexander Viro <v...@zeniv.linux.org.uk>
Cc: Christian Brauner <brau...@kernel.org>
Cc: linux-fsde...@vger.kernel.org
Cc: linux...@kvack.org
Suggested-by: Eric Biederman <ebied...@xmission.com>
Signed-off-by: Kees Cook <keesc...@chromium.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