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Don't ASAN-Poison Statically-Allocated Workspaces

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Addresses #2286.
This commit is contained in:
W. Felix Handte 2020-12-08 11:54:57 -05:00
parent f34d2f4192
commit db9e73cb07
2 changed files with 38 additions and 22 deletions
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6
lib/compress/zstd_compress.c
View File

@ -109,7 +109,7 @@ ZSTD_CCtx* ZSTD_initStaticCCtx(void* workspace, size_t workspaceSize)
ZSTD_CCtx* cctx;
if (workspaceSize <= sizeof(ZSTD_CCtx)) return NULL; /* minimum size */
if ((size_t)workspace & 7) return NULL; /* must be 8-aligned */
ZSTD_cwksp_init(&ws, workspace, workspaceSize);
ZSTD_cwksp_init(&ws, workspace, workspaceSize, 1 /* static */);
cctx = (ZSTD_CCtx*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CCtx));
if (cctx == NULL) return NULL;
@ -3692,7 +3692,7 @@ static ZSTD_CDict* ZSTD_createCDict_advanced_internal(size_t dictSize,
return NULL;
}
ZSTD_cwksp_init(&ws, workspace, workspaceSize);
ZSTD_cwksp_init(&ws, workspace, workspaceSize, 0 /* not static */);
cdict = (ZSTD_CDict*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CDict));
assert(cdict != NULL);
@ -3836,7 +3836,7 @@ const ZSTD_CDict* ZSTD_initStaticCDict(
{
ZSTD_cwksp ws;
ZSTD_cwksp_init(&ws, workspace, workspaceSize);
ZSTD_cwksp_init(&ws, workspace, workspaceSize, 1 /* static */);
cdict = (ZSTD_CDict*)ZSTD_cwksp_reserve_object(&ws, sizeof(ZSTD_CDict));
if (cdict == NULL) return NULL;
ZSTD_cwksp_move(&cdict->workspace, &ws);

26
lib/compress/zstd_cwksp.h
View File

@ -137,7 +137,8 @@ typedef struct {
void* tableValidEnd;
void* allocStart;
int allocFailed;
BYTE allocFailed;
BYTE isStatic;
int workspaceOversizedDuration;
ZSTD_cwksp_alloc_phase_e phase;
} ZSTD_cwksp;
@ -256,7 +257,9 @@ MEM_STATIC void* ZSTD_cwksp_reserve_internal(
/* Move alloc so there's ZSTD_CWKSP_ASAN_REDZONE_SIZE unused space on
* either size. */
alloc = (BYTE *)alloc + ZSTD_CWKSP_ASAN_REDZONE_SIZE;
if (!ws->isStatic) {
__asan_unpoison_memory_region(alloc, bytes);
}
#endif
return alloc;
@ -302,7 +305,9 @@ MEM_STATIC void* ZSTD_cwksp_reserve_table(ZSTD_cwksp* ws, size_t bytes) {
ws->tableEnd = end;
#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE)
if (!ws->isStatic) {
__asan_unpoison_memory_region(alloc, bytes);
}
#endif
return alloc;
@ -341,7 +346,9 @@ MEM_STATIC void* ZSTD_cwksp_reserve_object(ZSTD_cwksp* ws, size_t bytes) {
/* Move alloc so there's ZSTD_CWKSP_ASAN_REDZONE_SIZE unused space on
* either size. */
alloc = (BYTE *)alloc + ZSTD_CWKSP_ASAN_REDZONE_SIZE;
if (!ws->isStatic) {
__asan_unpoison_memory_region(alloc, bytes);
}
#endif
return alloc;
@ -398,7 +405,11 @@ MEM_STATIC void ZSTD_cwksp_clear_tables(ZSTD_cwksp* ws) {
DEBUGLOG(4, "cwksp: clearing tables!");
#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE)
{
/* We don't do this when the workspace is statically allocated, because
* when that is the case, we have no capability to hook into the end of the
* workspace's lifecycle to unpoison the memory.
*/
if (!ws->isStatic) {
size_t size = (BYTE*)ws->tableValidEnd - (BYTE*)ws->objectEnd;
__asan_poison_memory_region(ws->objectEnd, size);
}
@ -427,7 +438,11 @@ MEM_STATIC void ZSTD_cwksp_clear(ZSTD_cwksp* ws) {
#endif
#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE)
{
/* We don't do this when the workspace is statically allocated, because
* when that is the case, we have no capability to hook into the end of the
* workspace's lifecycle to unpoison the memory.
*/
if (!ws->isStatic) {
size_t size = (BYTE*)ws->workspaceEnd - (BYTE*)ws->objectEnd;
__asan_poison_memory_region(ws->objectEnd, size);
}
@ -447,7 +462,7 @@ MEM_STATIC void ZSTD_cwksp_clear(ZSTD_cwksp* ws) {
* Any existing values in the workspace are ignored (the previously managed
* buffer, if present, must be separately freed).
*/
MEM_STATIC void ZSTD_cwksp_init(ZSTD_cwksp* ws, void* start, size_t size) {
MEM_STATIC void ZSTD_cwksp_init(ZSTD_cwksp* ws, void* start, size_t size, int isStatic) {
DEBUGLOG(4, "cwksp: init'ing workspace with %zd bytes", size);
assert(((size_t)start & (sizeof(void*)-1)) == 0); /* ensure correct alignment */
ws->workspace = start;
@ -455,6 +470,7 @@ MEM_STATIC void ZSTD_cwksp_init(ZSTD_cwksp* ws, void* start, size_t size) {
ws->objectEnd = ws->workspace;
ws->tableValidEnd = ws->objectEnd;
ws->phase = ZSTD_cwksp_alloc_objects;
ws->isStatic = !!isStatic;
ZSTD_cwksp_clear(ws);
ws->workspaceOversizedDuration = 0;
ZSTD_cwksp_assert_internal_consistency(ws);
@ -464,7 +480,7 @@ MEM_STATIC size_t ZSTD_cwksp_create(ZSTD_cwksp* ws, size_t size, ZSTD_customMem
void* workspace = ZSTD_customMalloc(size, customMem);
DEBUGLOG(4, "cwksp: creating new workspace with %zd bytes", size);
RETURN_ERROR_IF(workspace == NULL, memory_allocation, "NULL pointer!");
ZSTD_cwksp_init(ws, workspace, size);
ZSTD_cwksp_init(ws, workspace, size, 0 /* not static */);
return 0;
}