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libpayload: cbfs: Require input size and output size for cbfs_decompress

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Currently, cbfs_decompress() calls ulzma() and ulz4f() for LZMA/LZ4
decompression. These two functions don't accept input/output size as
parameters. We can make cbfs_decompress more robust by calling ulzman()
and ulz4fn() instead. This could prevent us from overflowing destination
buffer.

BUG=none
BRANCH=none
TEST=boot into kernel on Kukui with COMPRESSED_PAYLOAD_LZMA /
     COMPRESSED_PAYLOAD_LZ4.

Change-Id: Ibe617825bd000ed618791d8e3c5f65bbbd5f7e33
Signed-off-by: You-Cheng Syu <youcheng@google.com>
Reviewed-on: https://review.coreboot.org/c/31606
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
This commit is contained in:
You-Cheng Syu
2019-02-27 15:29:15 +08:00
committed by Patrick Georgi
parent 08087a3e8a
commit 5ec1d24974
3 changed files with 17 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
payloads/libpayload/libcbfs/cbfs_core.c
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@@ -48,6 +48,7 @@
*
*/
#include <libpayload.h>
#include <cbfs.h>
#include <string.h>
#include <sysinfo.h>
@@ -256,7 +257,8 @@ void *cbfs_get_contents(struct cbfs_handle *handle, size_t *size, size_t limit)
return NULL;
ret = malloc(*size);
if (ret != NULL && !cbfs_decompress(algo, data, ret, *size)) {
if (ret != NULL &&
!cbfs_decompress(algo, data, on_media_size, ret, *size)) {
free(ret);
ret = NULL;
}
@@ -321,24 +323,27 @@ void *cbfs_get_attr(struct cbfs_handle *handle, uint32_t tag)
return NULL;
}
int cbfs_decompress(int algo, void *src, void *dst, int len)
size_t cbfs_decompress(int algo, const void *src, size_t srcn, void *dst,
size_t dstn)
{
size_t len;
switch (algo) {
case CBFS_COMPRESS_NONE:
len = MIN(srcn, dstn);
memcpy(dst, src, len);
return len;
#ifdef CBFS_CORE_WITH_LZMA
case CBFS_COMPRESS_LZMA:
return ulzma(src, dst);
return ulzman(src, srcn, dst, dstn);
#endif
#ifdef CBFS_CORE_WITH_LZ4
case CBFS_COMPRESS_LZ4:
return ulz4f(src, dst);
return ulz4fn(src, srcn, dst, dstn);
#endif
default:
ERROR("tried to decompress %d bytes with algorithm #%x,"
"but that algorithm id is unsupported.\n", len,
algo);
ERROR("tried to decompress %zu bytes with algorithm "
"#%x, but that algorithm id is unsupported.\n",
srcn, algo);
return 0;
}
}