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authorJulius Werner <jwerner@chromium.org>2018-05-18 17:56:23 -0700
committerMartin Roth <martinroth@google.com>2018-05-21 13:25:49 +0000
commitee87885343d5d4bbdc046166c2822a060968759e (patch)
tree123ff3686cc35f6f9d83e6529b7d406ff21e4a98 /src/superio/via
parentdfa51259ad1434aa75bef6d071ba5dfacbf13cba (diff)
cbfs-compression-tool: Fix minor edge cases in algorithm type parsing
This patch adds two minor improvements to the way cbfs-compression-tool parses the compression algorithm type that is passed through the -t option of the 'compress' subcommand. These improvements are intended to prevent accidents and unexpected behavior when using the cbfs-compression-tool, in particular in automated contexts such as a Makefile rule. In the first part of this patch, a return statement is inserted after the 'if (algo->name == NULL)' check of the compress() function. This causes the function to exit immediately and subsequently abort the program when the algorithm type was not detected correctly. Previously, execution would continue with the 'algo' pointer pointing to the zeroed out stopper entry of the types_cbfs_compression[] array. The ultimate effect of this would be to pass 0 as 'algo->type' to the compression_function() function, which happens to be the same enumeration value as is used for CBFS_COMPRESS_NONE, leading to a valid compression function result that matches the behavior of no compression. Thus, if a script calling cbfs-compression-tool compress contained a typo in the -t parameter, it would continue running with an unintended compression result rather than immediately exiting cleanly. In the second part of this patch, the strcmp() function is replaced with strcasecmp() when comparing 'algo->name' with the 'algoname' parameter that was passed to the compress() function. strcasecmp() uses an identical function signature as strcmp() and is thus suitable as a drop-in replacement, but it differs in behavior: rather than only returning a result of 0 when the two NULL-terminated input strings are character by character identical, the strcasecmp() function applies a weaker concept of identity where characters of the latin alphabet (hexadecimal ranges 0x41 through 0x5a and 0x61 through 0x7a) are also considered identical to other characters that differ from them only in their case. This causes the -t parameter of cbfs-compression-tool compress to also accept lowercase spellings of the available compression algorithms, such as "lz4" instead of "LZ4" and "lzma" instead of "LZMA". As an unintended but harmless side-effect, mixed-case spellings such as "lZ4" or "LZmA" will also be recognized as valid compression algorithms. (Note that since the character "4" (hexadecimal 0x34) of the "LZ4" compression type name is not part of the above-mentioned ranges of latin alphabet characters, no new substitutions become valid for that part of the "LZ4" string with this patch.) Change-Id: I375dbaeefaa0d4b0c5be81bf7668f8f330f1cf61 Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://review.coreboot.org/26389 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src/superio/via')
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