diff options
| author | Phillip Lougher <phillip@lougher.demon.co.uk> | 2009-08-06 15:09:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-08-07 10:39:56 -0700 |
| commit | b1af4315d823a2b6659c5b14bc17f7bc61878ef4 (patch) | |
| tree | d9a04709f52c27f59a93875fd705dbed2c581b09 /lib/decompress_unlzma.c | |
| parent | daeb6b6fbe27049f465c48a7d0ee5555c3b84064 (diff) | |
bzip2/lzma: remove nasty uncompressed size hack in pre-boot environment
decompress_bunzip2 and decompress_unlzma have a nasty hack that subtracts
4 from the input length if being called in the pre-boot environment.
This is a nasty hack because it relies on the fact that flush = NULL only
when called from the pre-boot environment (i.e.
arch/x86/boot/compressed/misc.c). initramfs.c/do_mounts_rd.c pass in a
flush buffer (flush != NULL).
This hack prevents the decompressors from being used with flush = NULL by
other callers unless knowledge of the hack is propagated to them.
This patch removes the hack by making decompress (called only from the
pre-boot environment) a wrapper function that subtracts 4 from the input
length before calling the decompressor.
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/decompress_unlzma.c')
| -rw-r--r-- | lib/decompress_unlzma.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/lib/decompress_unlzma.c b/lib/decompress_unlzma.c index 32123a1340e..d3f9468e49d 100644 --- a/lib/decompress_unlzma.c +++ b/lib/decompress_unlzma.c @@ -29,7 +29,9 @@ *Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ -#ifndef STATIC +#ifdef STATIC +#define PREBOOT +#else #include <linux/decompress/unlzma.h> #endif /* STATIC */ @@ -543,9 +545,7 @@ STATIC inline int INIT unlzma(unsigned char *buf, int in_len, int ret = -1; set_error_fn(error_fn); - if (!flush) - in_len -= 4; /* Uncompressed size hack active in pre-boot - environment */ + if (buf) inbuf = buf; else @@ -645,4 +645,15 @@ exit_0: return ret; } -#define decompress unlzma +#ifdef PREBOOT +STATIC int INIT decompress(unsigned char *buf, int in_len, + int(*fill)(void*, unsigned int), + int(*flush)(void*, unsigned int), + unsigned char *output, + int *posp, + void(*error_fn)(char *x) + ) +{ + return unlzma(buf, in_len - 4, fill, flush, output, posp, error_fn); +} +#endif |