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Fix a Valgrind integration flaw.

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Fix a Valgrind integration flaw that caused Valgrind warnings about
reads of uninitialized memory in arena chunk headers.
This commit is contained in:
Jason Evans 2013-10-19 21:40:20 -07:00
parent 543abf7e6c
commit 87a02d2bb1
3 changed files with 57 additions and 32 deletions
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66
include/jemalloc/internal/arena.h
View File

@ -441,6 +441,7 @@ void arena_postfork_child(arena_t *arena);
#ifndef JEMALLOC_ENABLE_INLINE
arena_chunk_map_t *arena_mapp_get(arena_chunk_t *chunk, size_t pageind);
size_t *arena_mapbitsp_get(arena_chunk_t *chunk, size_t pageind);
size_t arena_mapbitsp_read(size_t *mapbitsp);
size_t arena_mapbits_get(arena_chunk_t *chunk, size_t pageind);
size_t arena_mapbits_unallocated_size_get(arena_chunk_t *chunk,
size_t pageind);
@ -451,6 +452,7 @@ size_t arena_mapbits_dirty_get(arena_chunk_t *chunk, size_t pageind);
size_t arena_mapbits_unzeroed_get(arena_chunk_t *chunk, size_t pageind);
size_t arena_mapbits_large_get(arena_chunk_t *chunk, size_t pageind);
size_t arena_mapbits_allocated_get(arena_chunk_t *chunk, size_t pageind);
void arena_mapbitsp_write(size_t *mapbitsp, size_t mapbits);
void arena_mapbits_unallocated_set(arena_chunk_t *chunk, size_t pageind,
size_t size, size_t flags);
void arena_mapbits_unallocated_size_set(arena_chunk_t *chunk, size_t pageind,
@ -497,11 +499,18 @@ arena_mapbitsp_get(arena_chunk_t *chunk, size_t pageind)
return (&arena_mapp_get(chunk, pageind)->bits);
}
JEMALLOC_ALWAYS_INLINE size_t
arena_mapbitsp_read(size_t *mapbitsp)
{
return (*mapbitsp);
}
JEMALLOC_ALWAYS_INLINE size_t
arena_mapbits_get(arena_chunk_t *chunk, size_t pageind)
{
return (*arena_mapbitsp_get(chunk, pageind));
return (arena_mapbitsp_read(arena_mapbitsp_get(chunk, pageind)));
}
JEMALLOC_ALWAYS_INLINE size_t
@ -584,83 +593,90 @@ arena_mapbits_allocated_get(arena_chunk_t *chunk, size_t pageind)
return (mapbits & CHUNK_MAP_ALLOCATED);
}
JEMALLOC_ALWAYS_INLINE void
arena_mapbitsp_write(size_t *mapbitsp, size_t mapbits)
{
*mapbitsp = mapbits;
}
JEMALLOC_ALWAYS_INLINE void
arena_mapbits_unallocated_set(arena_chunk_t *chunk, size_t pageind, size_t size,
size_t flags)
{
size_t *mapbitsp;
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
mapbitsp = arena_mapbitsp_get(chunk, pageind);
assert((size & PAGE_MASK) == 0);
assert((flags & ~CHUNK_MAP_FLAGS_MASK) == 0);
assert((flags & (CHUNK_MAP_DIRTY|CHUNK_MAP_UNZEROED)) == flags);
*mapbitsp = size | CHUNK_MAP_BININD_INVALID | flags;
arena_mapbitsp_write(mapbitsp, size | CHUNK_MAP_BININD_INVALID | flags);
}
JEMALLOC_ALWAYS_INLINE void
arena_mapbits_unallocated_size_set(arena_chunk_t *chunk, size_t pageind,
size_t size)
{
size_t *mapbitsp;
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
size_t mapbits = arena_mapbitsp_read(mapbitsp);
mapbitsp = arena_mapbitsp_get(chunk, pageind);
assert((size & PAGE_MASK) == 0);
assert((*mapbitsp & (CHUNK_MAP_LARGE|CHUNK_MAP_ALLOCATED)) == 0);
*mapbitsp = size | (*mapbitsp & PAGE_MASK);
assert((mapbits & (CHUNK_MAP_LARGE|CHUNK_MAP_ALLOCATED)) == 0);
arena_mapbitsp_write(mapbitsp, size | (mapbits & PAGE_MASK));
}
JEMALLOC_ALWAYS_INLINE void
arena_mapbits_large_set(arena_chunk_t *chunk, size_t pageind, size_t size,
size_t flags)
{
size_t *mapbitsp;
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
size_t mapbits = arena_mapbitsp_read(mapbitsp);
size_t unzeroed;
mapbitsp = arena_mapbitsp_get(chunk, pageind);
assert((size & PAGE_MASK) == 0);
assert((flags & CHUNK_MAP_DIRTY) == flags);
unzeroed = *mapbitsp & CHUNK_MAP_UNZEROED; /* Preserve unzeroed. */
*mapbitsp = size | CHUNK_MAP_BININD_INVALID | flags | unzeroed |
CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED;
unzeroed = mapbits & CHUNK_MAP_UNZEROED; /* Preserve unzeroed. */
arena_mapbitsp_write(mapbitsp, size | CHUNK_MAP_BININD_INVALID | flags
| unzeroed | CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED);
}
JEMALLOC_ALWAYS_INLINE void
arena_mapbits_large_binind_set(arena_chunk_t *chunk, size_t pageind,
size_t binind)
{
size_t *mapbitsp;
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
size_t mapbits = arena_mapbitsp_read(mapbitsp);
assert(binind <= BININD_INVALID);
mapbitsp = arena_mapbitsp_get(chunk, pageind);
assert(arena_mapbits_large_size_get(chunk, pageind) == PAGE);
*mapbitsp = (*mapbitsp & ~CHUNK_MAP_BININD_MASK) | (binind <<
CHUNK_MAP_BININD_SHIFT);
arena_mapbitsp_write(mapbitsp, (mapbits & ~CHUNK_MAP_BININD_MASK) |
(binind << CHUNK_MAP_BININD_SHIFT));
}
JEMALLOC_ALWAYS_INLINE void
arena_mapbits_small_set(arena_chunk_t *chunk, size_t pageind, size_t runind,
size_t binind, size_t flags)
{
size_t *mapbitsp;
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
size_t mapbits = arena_mapbitsp_read(mapbitsp);
size_t unzeroed;
assert(binind < BININD_INVALID);
mapbitsp = arena_mapbitsp_get(chunk, pageind);
assert(pageind - runind >= map_bias);
assert((flags & CHUNK_MAP_DIRTY) == flags);
unzeroed = *mapbitsp & CHUNK_MAP_UNZEROED; /* Preserve unzeroed. */
*mapbitsp = (runind << LG_PAGE) | (binind << CHUNK_MAP_BININD_SHIFT) |
flags | unzeroed | CHUNK_MAP_ALLOCATED;
unzeroed = mapbits & CHUNK_MAP_UNZEROED; /* Preserve unzeroed. */
arena_mapbitsp_write(mapbitsp, (runind << LG_PAGE) | (binind <<
CHUNK_MAP_BININD_SHIFT) | flags | unzeroed | CHUNK_MAP_ALLOCATED);
}
JEMALLOC_ALWAYS_INLINE void
arena_mapbits_unzeroed_set(arena_chunk_t *chunk, size_t pageind,
size_t unzeroed)
{
size_t *mapbitsp;
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
size_t mapbits = arena_mapbitsp_read(mapbitsp);
mapbitsp = arena_mapbitsp_get(chunk, pageind);
*mapbitsp = (*mapbitsp & ~CHUNK_MAP_UNZEROED) | unzeroed;
arena_mapbitsp_write(mapbitsp, (mapbits & ~CHUNK_MAP_UNZEROED) |
unzeroed);
}
JEMALLOC_INLINE bool

2
include/jemalloc/internal/private_namespace.h
View File

@ -33,6 +33,8 @@
#define arena_mapbits_unzeroed_get JEMALLOC_N(arena_mapbits_unzeroed_get)
#define arena_mapbits_unzeroed_set JEMALLOC_N(arena_mapbits_unzeroed_set)
#define arena_mapbitsp_get JEMALLOC_N(arena_mapbitsp_get)
#define arena_mapbitsp_read JEMALLOC_N(arena_mapbitsp_read)
#define arena_mapbitsp_write JEMALLOC_N(arena_mapbitsp_write)
#define arena_mapp_get JEMALLOC_N(arena_mapp_get)
#define arena_maxclass JEMALLOC_N(arena_maxclass)
#define arena_new JEMALLOC_N(arena_new)

21
src/arena.c
View File

@ -569,17 +569,24 @@ arena_chunk_alloc(arena_t *arena)
* unless the chunk is not zeroed.
*/
if (zero == false) {
VALGRIND_MAKE_MEM_UNDEFINED(
(void *)arena_mapp_get(chunk, map_bias+1),
(size_t)((uintptr_t) arena_mapp_get(chunk,
chunk_npages-1) - (uintptr_t)arena_mapp_get(chunk,
map_bias+1)));
for (i = map_bias+1; i < chunk_npages-1; i++)
arena_mapbits_unzeroed_set(chunk, i, unzeroed);
} else if (config_debug) {
} else {
VALGRIND_MAKE_MEM_DEFINED(
(void *)arena_mapp_get(chunk, map_bias+1),
(void *)((uintptr_t)
arena_mapp_get(chunk, chunk_npages-1)
- (uintptr_t)arena_mapp_get(chunk, map_bias+1)));
for (i = map_bias+1; i < chunk_npages-1; i++) {
assert(arena_mapbits_unzeroed_get(chunk, i) ==
unzeroed);
(size_t)((uintptr_t) arena_mapp_get(chunk,
chunk_npages-1) - (uintptr_t)arena_mapp_get(chunk,
map_bias+1)));
if (config_debug) {
for (i = map_bias+1; i < chunk_npages-1; i++) {
assert(arena_mapbits_unzeroed_get(chunk,
i) == unzeroed);
}
}
}
arena_mapbits_unallocated_set(chunk, chunk_npages-1,