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| author | Julius Werner <jwerner@chromium.org> | 2016-02-08 11:46:22 -0800 |
|---|---|---|
| committer | Julius Werner <jwerner@chromium.org> | 2016-02-12 22:00:55 +0100 |
| commit | a25b5d257dbfbff808b19bf8c48565435e6bef9d (patch) | |
| tree | a6e818cf02d087ba8173081f0f8cbba1cac67908 /src/lib/lzmadecode.c | |
| parent | d189987fc923daf0709c69946b4a267cb2c374af (diff) | |
| download | coreboot-a25b5d257dbfbff808b19bf8c48565435e6bef9d.tar.xz | |
lzma: Port size-checking ulzman() version to coreboot
We've had a second version of ulzma() that would check the input and
output buffer sizes in libpayload for a while now. Since it's generally
never a bad idea to double-check for overruns, let's port it to coreboot
and use it where applicable. (This requires a small fix in the four byte
at a time read optimization we only have in coreboot, since it made the
stream counter hit the end a little earlier than the algorithm liked and
could trigger an assertion.)
BRANCH=None
BUG=None
TEST=Booted Oak, Jerry and Falco.
Change-Id: Id566b31dfa896ea1b991badf5a6ad9d075aef987
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/13637
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/lib/lzmadecode.c')
| -rw-r--r-- | src/lib/lzmadecode.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/lib/lzmadecode.c b/src/lib/lzmadecode.c index ada72260f2..fbf15964a6 100644 --- a/src/lib/lzmadecode.c +++ b/src/lib/lzmadecode.c @@ -29,9 +29,12 @@ #define kBitModelTotal (1 << kNumBitModelTotalBits) #define kNumMoveBits 5 -/* Use 32-bit reads whenever possible to avoid bad flash performance. */ +/* Use 32-bit reads whenever possible to avoid bad flash performance. Fall back + * to byte reads for last 4 bytes since RC_TEST returns an error when BufferLim + * is *reached* (not surpassed!), meaning we can't allow that to happen while + * there are still bytes to decode from the algorithm's point of view. */ #define RC_READ_BYTE (look_ahead_ptr < 4 ? look_ahead.raw[look_ahead_ptr++] \ - : ((((uintptr_t) Buffer & 3) || ((SizeT) (BufferLim - Buffer) < 4)) ? (*Buffer++) \ + : ((((uintptr_t) Buffer & 3) || ((SizeT) (BufferLim - Buffer) <= 4)) ? (*Buffer++) \ : ((look_ahead.dw = *(UInt32 *)Buffer), (Buffer += 4), (look_ahead_ptr = 1), look_ahead.raw[0]))) #define RC_INIT2 Code = 0; Range = 0xFFFFFFFF; \ |