From 5ec1d24974de8280a615047804bdfa73720777c8 Mon Sep 17 00:00:00 2001 From: You-Cheng Syu Date: Wed, 27 Feb 2019 15:29:15 +0800 Subject: libpayload: cbfs: Require input size and output size for cbfs_decompress 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 Reviewed-on: https://review.coreboot.org/c/31606 Tested-by: build bot (Jenkins) Reviewed-by: Julius Werner Reviewed-by: Daisuke Nojiri --- payloads/libpayload/include/cbfs_core.h | 5 +++-- payloads/libpayload/libcbfs/cbfs.c | 3 ++- payloads/libpayload/libcbfs/cbfs_core.c | 19 ++++++++++++------- 3 files changed, 17 insertions(+), 10 deletions(-) (limited to 'payloads') diff --git a/payloads/libpayload/include/cbfs_core.h b/payloads/libpayload/include/cbfs_core.h index 364f6c474d..a707154648 100644 --- a/payloads/libpayload/include/cbfs_core.h +++ b/payloads/libpayload/include/cbfs_core.h @@ -253,8 +253,9 @@ struct cbfs_media { void *cbfs_get_file_content(struct cbfs_media *media, const char *name, int type, size_t *sz); -/* returns decompressed size on success, 0 on failure */ -int cbfs_decompress(int algo, void *src, void *dst, int len); +/* Returns decompressed size on success, 0 on failure. */ +size_t cbfs_decompress(int algo, const void *src, size_t srcn, void *dst, + size_t dstn); /* returns a pointer to CBFS master header, or CBFS_HEADER_INVALID_ADDRESS * on failure */ diff --git a/payloads/libpayload/libcbfs/cbfs.c b/payloads/libpayload/libcbfs/cbfs.c index 577fb2075a..d679e6708a 100644 --- a/payloads/libpayload/libcbfs/cbfs.c +++ b/payloads/libpayload/libcbfs/cbfs.c @@ -114,8 +114,9 @@ void * cbfs_load_stage(struct cbfs_media *media, const char *name) final_size = cbfs_decompress(stage->compression, ((unsigned char *) stage) + sizeof(struct cbfs_stage), + stage->len, (void *) (uintptr_t) stage->load, - stage->len); + stage->memlen); if (!final_size) { entry = -1; goto out; diff --git a/payloads/libpayload/libcbfs/cbfs_core.c b/payloads/libpayload/libcbfs/cbfs_core.c index 91f2603446..4ecda30395 100644 --- a/payloads/libpayload/libcbfs/cbfs_core.c +++ b/payloads/libpayload/libcbfs/cbfs_core.c @@ -48,6 +48,7 @@ * */ +#include #include #include #include @@ -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; } } -- cgit v1.2.3