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authorPhillip Lougher <phillip@lougher.demon.co.uk>2009-08-06 15:09:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-08-07 10:39:56 -0700
commitb1af4315d823a2b6659c5b14bc17f7bc61878ef4 (patch)
treed9a04709f52c27f59a93875fd705dbed2c581b09 /lib/decompress_unlzma.c
parentdaeb6b6fbe27049f465c48a7d0ee5555c3b84064 (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.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/lib/decompress_unlzma.c b/lib/decompress_unlzma.c
index 32123a1340e6..d3f9468e49dc 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