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Correctly copy microdescs/extrinfos with internal NUL bytes

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Fixes bug 8037; bugfix on 0.2.0.1-alpha; reported by cypherpunks.
This commit is contained in:
Nick Mathewson 2013-01-26 18:01:06 -05:00
parent dfbd19df41
commit acd72d4e3e
4 changed files with 23 additions and 2 deletions
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4
changes/bug8037 Normal file
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@ -0,0 +1,4 @@
o Minor bugfixes:
- Correctly store microdescriptors and extrainfo descriptors with
an internal NUL byte. Fixes bug 8037; bugfix on 0.2.0.1-alpha.
Bug reported by "cypherpunks".

14
src/common/util.c
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@ -282,6 +282,20 @@ tor_memdup_(const void *mem, size_t len DMALLOC_PARAMS)
return dup;
}
/** As tor_memdup(), but add an extra 0 byte at the end of the resulting
* memory. */
void *
tor_memdup_nulterm(const void *mem, size_t len DMALLOC_PARAMS)
{
char *dup;
tor_assert(len < SIZE_T_CEILING+1);
tor_assert(mem);
dup = tor_malloc_(len+1 DMALLOC_FN_ARGS);
memcpy(dup, mem, len);
dup[len] = '\0';
return dup;
}
/** Helper for places that need to take a function pointer to the right
* spelling of "free()". */
void

3
src/common/util.h
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@ -83,6 +83,8 @@ char *tor_strndup_(const char *s, size_t n DMALLOC_PARAMS)
ATTR_MALLOC ATTR_NONNULL((1));
void *tor_memdup_(const void *mem, size_t len DMALLOC_PARAMS)
ATTR_MALLOC ATTR_NONNULL((1));
void *tor_memdup_nulterm_(const void *mem, size_t len DMALLOC_PARAMS)
ATTR_MALLOC ATTR_NONNULL((1));
void tor_free_(void *mem);
#ifdef USE_DMALLOC
extern int dmalloc_free(const char *file, const int line, void *pnt,
@ -117,6 +119,7 @@ extern int dmalloc_free(const char *file, const int line, void *pnt,
#define tor_strdup(s) tor_strdup_(s DMALLOC_ARGS)
#define tor_strndup(s, n) tor_strndup_(s, n DMALLOC_ARGS)
#define tor_memdup(s, n) tor_memdup_(s, n DMALLOC_ARGS)
#define tor_memdup_nulterm(s, n) tor_memdup_nulterm_(s, n DMALLOC_ARGS)
void tor_log_mallinfo(int severity);

4
src/or/routerparse.c
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@ -1494,7 +1494,7 @@ extrainfo_parse_entry_from_string(const char *s, const char *end,
extrainfo = tor_malloc_zero(sizeof(extrainfo_t));
extrainfo->cache_info.is_extrainfo = 1;
if (cache_copy)
extrainfo->cache_info.signed_descriptor_body = tor_strndup(s, end-s);
extrainfo->cache_info.signed_descriptor_body = tor_memdup_nulterm(s, end-s);
extrainfo->cache_info.signed_descriptor_len = end-s;
memcpy(extrainfo->cache_info.signed_descriptor_digest, digest, DIGEST_LEN);
@ -4237,7 +4237,7 @@ microdescs_parse_from_string(const char *s, const char *eos,
md->bodylen = start_of_next_microdesc - cp;
if (copy_body)
md->body = tor_strndup(cp, md->bodylen);
md->body = tor_memdup_nulterm(cp, md->bodylen);
else
md->body = (char*)cp;
md->off = cp - start;