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* grub-core/normal/crypto.c (grub_crypto_autoload): Prevent

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infinite recursion using counter.
	* grub-core/lib/xzembed/xz_dec_stream.c (xz_dec_init): Defer s->crc32
	init to skip it if the magic check fails.
	(dec_stream_header): Init s->crc32.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2012-01-23 03:39:37 +01:00
parent 8f9d3a8c36
commit 7816a17ed1
3 changed files with 19 additions and 5 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2012-01-23 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/normal/crypto.c (grub_crypto_autoload): Prevent
infinite recursion using counter.
* grub-core/lib/xzembed/xz_dec_stream.c (xz_dec_init): Defer s->crc32
init to skip it if the magic check fails.
(dec_stream_header): Init s->crc32.
2012-01-22 Vladimir Serbinenko <phcoder@gmail.com> 2012-01-22 Vladimir Serbinenko <phcoder@gmail.com>
2012-01-22 Zachary Bedell <pendorbound@gmail.com> 2012-01-22 Zachary Bedell <pendorbound@gmail.com>
2012-01-22 Richard Laager <rlaager@wiktel.com> 2012-01-22 Richard Laager <rlaager@wiktel.com>

6
grub-core/lib/xzembed/xz_dec_stream.c
View file

@ -445,6 +445,8 @@ static enum xz_ret dec_stream_header(struct xz_dec *s)
return XZ_FORMAT_ERROR; return XZ_FORMAT_ERROR;
#ifndef GRUB_EMBED_DECOMPRESSOR #ifndef GRUB_EMBED_DECOMPRESSOR
s->crc32 = grub_crypto_lookup_md_by_name ("CRC32");
if (s->crc32) if (s->crc32)
{ {
uint64_t hash_context[(s->crc32->contextsize + 7) / 8]; uint64_t hash_context[(s->crc32->contextsize + 7) / 8];
@ -958,10 +960,6 @@ struct xz_dec * xz_dec_init(uint32_t dict_max)
memset (s, 0, sizeof (*s)); memset (s, 0, sizeof (*s));
#ifndef GRUB_EMBED_DECOMPRESSOR
s->crc32 = grub_crypto_lookup_md_by_name ("CRC32");
#endif
s->single_call = dict_max == 0; s->single_call = dict_max == 0;
#ifdef XZ_DEC_BCJ #ifdef XZ_DEC_BCJ

8
grub-core/normal/crypto.c
View file

@ -38,6 +38,13 @@ grub_crypto_autoload (const char *name)
{ {
struct load_spec *cur; struct load_spec *cur;
grub_dl_t mod; grub_dl_t mod;
static int depth = 0;
/* Some bufio of filesystems may want some crypto modules.
It may result in infinite recursion. Hence this check. */
if (depth)
return;
depth++;
for (cur = crypto_specs; cur; cur = cur->next) for (cur = crypto_specs; cur; cur = cur->next)
if (grub_strcasecmp (name, cur->name) == 0) if (grub_strcasecmp (name, cur->name) == 0)
@ -47,6 +54,7 @@ grub_crypto_autoload (const char *name)
grub_dl_ref (mod); grub_dl_ref (mod);
grub_errno = GRUB_ERR_NONE; grub_errno = GRUB_ERR_NONE;
} }
depth--;
} }
static void static void