From: akpm@osdl.org Date: Tue, 11 Oct 2005 15:29:08 +0000 (-0700) Subject: [PATCH] binfmt_elf bss padding fix X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6de505173e24e76bb33a2595312e0c2b44d49e58;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git [PATCH] binfmt_elf bss padding fix Nir Tzachar points out that if an ELF file specifies a zero-length bss at a whacky address, we cannot load that binary because padzero() tries to zero out the end of the page at the whacky address, and that may not be writeable. See also http://bugzilla.kernel.org/show_bug.cgi?id=5411 So teach load_elf_binary() to skip the bss settng altogether if the elf file has a zero-length bss segment. Cc: Roland McGrath Cc: Daniel Jacobowitz Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 7976a238f0a3..d4b15576e584 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -905,7 +905,7 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs) send_sig(SIGKILL, current, 0); goto out_free_dentry; } - if (padzero(elf_bss)) { + if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { send_sig(SIGSEGV, current, 0); retval = -EFAULT; /* Nobody gets to see this, but.. */ goto out_free_dentry;