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a98bd864e1
[ Upstream commit cc47f07234f72cbd8e2c973cdbf2a6730660a463 ] Unlike the decompression code, the compression code in LZO never checked for output overruns. It instead assumes that the caller always provides enough buffer space, disregarding the buffer length provided by the caller. Add a safe compression interface that checks for the end of buffer before each write. Use the safe interface in crypto/lzo. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Sasha Levin <sashal@kernel.org>
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LZO_H__
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#define __LZO_H__
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/*
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* LZO Public Kernel Interface
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* A mini subset of the LZO real-time data compression library
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*
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* Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
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*
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* The full LZO package can be found at:
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* http://www.oberhumer.com/opensource/lzo/
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*
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* Changed for Linux kernel use by:
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* Nitin Gupta <nitingupta910@gmail.com>
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* Richard Purdie <rpurdie@openedhand.com>
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*/
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#define LZO1X_1_MEM_COMPRESS (8192 * sizeof(unsigned short))
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#define LZO1X_MEM_COMPRESS LZO1X_1_MEM_COMPRESS
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#define lzo1x_worst_compress(x) ((x) + ((x) / 16) + 64 + 3 + 2)
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/* This requires 'wrkmem' of size LZO1X_1_MEM_COMPRESS */
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int lzo1x_1_compress(const unsigned char *src, size_t src_len,
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unsigned char *dst, size_t *dst_len, void *wrkmem);
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/* Same as above but does not write more than dst_len to dst. */
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int lzo1x_1_compress_safe(const unsigned char *src, size_t src_len,
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unsigned char *dst, size_t *dst_len, void *wrkmem);
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/* This requires 'wrkmem' of size LZO1X_1_MEM_COMPRESS */
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int lzorle1x_1_compress(const unsigned char *src, size_t src_len,
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unsigned char *dst, size_t *dst_len, void *wrkmem);
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/* Same as above but does not write more than dst_len to dst. */
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int lzorle1x_1_compress_safe(const unsigned char *src, size_t src_len,
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unsigned char *dst, size_t *dst_len, void *wrkmem);
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/* safe decompression with overrun testing */
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int lzo1x_decompress_safe(const unsigned char *src, size_t src_len,
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unsigned char *dst, size_t *dst_len);
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/*
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* Return values (< 0 = Error)
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*/
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#define LZO_E_OK 0
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#define LZO_E_ERROR (-1)
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#define LZO_E_OUT_OF_MEMORY (-2)
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#define LZO_E_NOT_COMPRESSIBLE (-3)
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#define LZO_E_INPUT_OVERRUN (-4)
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#define LZO_E_OUTPUT_OVERRUN (-5)
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#define LZO_E_LOOKBEHIND_OVERRUN (-6)
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#define LZO_E_EOF_NOT_FOUND (-7)
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#define LZO_E_INPUT_NOT_CONSUMED (-8)
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#define LZO_E_NOT_YET_IMPLEMENTED (-9)
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#define LZO_E_INVALID_ARGUMENT (-10)
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#endif
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