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zero-filesize-elf-segments : Fix handling of ELF segments with zero filesize
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.
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| Initial date: | 2005/12/01 |
| Description: | Fix handling of ELF segments with zero filesize |
| Author(s): | David Gibson |
| Abstract: | 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.
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(C) Willy Tarreau - 2008-06-01