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[PATCH] binfmt_elf bss padding fix

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Nir Tzachar <tzachar@cs.bgu.ac.il> 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 <roland@redhat.com>
Cc: Daniel Jacobowitz <dan@debian.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
akpm@osdl.org 2005-10-11 08:29:08 -07:00 committed by Linus Torvalds
parent a0c111c631
commit 6de505173e
1 changed files with 1 additions and 1 deletions
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2
fs/binfmt_elf.c
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@ -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;