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| author | Randy Robertson <rmrobert@vmware.com> | 2009-04-13 14:40:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-13 15:04:31 -0700 |
| commit | d20d5a7456d57d8affa88f45f27ae96ea49c29e4 (patch) | |
| tree | baa9169c23c16b55d46968b5b4964c6e950645e9 | |
| parent | f1671f6d783a2385d32e11f456cbe32f0e4b4b49 (diff) | |
| download | linux-d20d5a7456d57d8affa88f45f27ae96ea49c29e4.tar.gz linux-d20d5a7456d57d8affa88f45f27ae96ea49c29e4.tar.bz2 linux-d20d5a7456d57d8affa88f45f27ae96ea49c29e4.zip | |
initramfs: fix initramfs to work with hardlinked init
Change cb6ff208076b5f434db1b8c983429269d719cef5 ("NOMMU: Support XIP on
initramfs") seems to have broken booting from initramfs with /sbin/init
being a hardlink.
It seems like the logic required for XIP on nommu, i.e. ftruncate to
reported cpio header file size (body_len) is broken for hardlinks, which
have a reported size of 0, and the truncate thus nukes the contents of the
file (in my case busybox), making boot impossible and ending with runaway
loop modprobe binfmt-0000 - and of course 0000 is not a valid binary
format.
My fix is to only call ftruncate if size is non-zero which fixes things
for me, but I'm not certain whether this will break XIP for those files on
nommu systems, although I would guess not.
Signed-off-by: Randy Robertson <rmrobert@vmware.com>
Acked-by: David Howells <dhowells@redhat.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | init/initramfs.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/init/initramfs.c b/init/initramfs.c index e44f2d932cc4..9ee7b7810417 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -310,7 +310,8 @@ static int __init do_name(void) if (wfd >= 0) { sys_fchown(wfd, uid, gid); sys_fchmod(wfd, mode); - sys_ftruncate(wfd, body_len); + if (body_len) + sys_ftruncate(wfd, body_len); vcollected = kstrdup(collected, GFP_KERNEL); state = CopyFile; } |