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[PATCH] Fix handling of ELF segments with zero filesize

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mmap() returns -EINVAL if given a zero length, and thus elf_map() in
binfmt_elf.c does likewise if it attempts to map a (page-aligned) ELF
segment with zero filesize.  Such a situation never arises with the default
linker scripts, but there's nothing inherently wrong with zero-filesize
(but non-zero memsize) ELF segments.  Custom linker scripts can generate
them, and the kernel should be able to map them; this patch makes it so.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Gibson 2006-01-08 01:03:35 -08:00 committed by Linus Torvalds
parent cc398c2eae
commit dda6ebde96
1 changed files with 9 additions and 3 deletions
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12
fs/binfmt_elf.c
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@ -288,11 +288,17 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
struct elf_phdr *eppnt, int prot, int type)
{
unsigned long map_addr;
unsigned long pageoffset = ELF_PAGEOFFSET(eppnt->p_vaddr);
down_write(&current->mm->mmap_sem);
map_addr = do_mmap(filep, ELF_PAGESTART(addr),
eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr), prot, type,
eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr));
/* mmap() will return -EINVAL if given a zero size, but a
* segment with zero filesize is perfectly valid */
if (eppnt->p_filesz + pageoffset)
map_addr = do_mmap(filep, ELF_PAGESTART(addr),
eppnt->p_filesz + pageoffset, prot, type,
eppnt->p_offset - pageoffset);
else
map_addr = ELF_PAGESTART(addr);
up_write(&current->mm->mmap_sem);
return(map_addr);
}