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mdbx: minimize the size of poisoned/unpoisoned regions to avoid ASAN hangs.

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More for second case of https://github.com/erthink/libmdbx/issues/217
This commit is contained in:
Leonid Yuriev 2021-07-10 16:09:02 +03:00
parent 891d68838a
commit 1740043678
2 changed files with 40 additions and 15 deletions
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12
src/core.c
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@ -11630,11 +11630,13 @@ __cold static int mdbx_setup_dxb(MDBX_env *env, const int lck_rc,
mdbx_assert(env, used_bytes >= pgno2bytes(env, NUM_METAS) &&
used_bytes <= env->me_dxb_mmap.limit);
#if defined(MDBX_USE_VALGRIND) || defined(__SANITIZE_ADDRESS__)
VALGRIND_MAKE_MEM_NOACCESS(env->me_map + used_bytes,
env->me_dxb_mmap.limit - used_bytes);
ASAN_POISON_MEMORY_REGION(env->me_map + used_bytes,
env->me_dxb_mmap.limit - used_bytes);
env->me_poison_edge = bytes2pgno(env, env->me_dxb_mmap.limit);
if (env->me_dxb_mmap.filesize > used_bytes) {
VALGRIND_MAKE_MEM_NOACCESS(env->me_map + used_bytes,
env->me_dxb_mmap.filesize - used_bytes);
ASAN_POISON_MEMORY_REGION(env->me_map + used_bytes,
env->me_dxb_mmap.filesize - used_bytes);
}
env->me_poison_edge = bytes2pgno(env, env->me_dxb_mmap.filesize);
#endif /* MDBX_USE_VALGRIND || __SANITIZE_ADDRESS__ */
//----------------------------------------- validate head & steady meta-pages

43
src/osal.c
View File

@ -1547,7 +1547,10 @@ MDBX_INTERNAL_FUNC int mdbx_munmap(mdbx_mmap_t *map) {
/* Unpoisoning is required for ASAN to avoid false-positive diagnostic
* when this memory will re-used by malloc or another mmapping.
* See https://github.com/erthink/libmdbx/pull/93#issuecomment-613687203 */
ASAN_UNPOISON_MEMORY_REGION(map->address, map->limit);
ASAN_UNPOISON_MEMORY_REGION(map->address,
(map->filesize && map->filesize < map->limit)
? map->filesize
: map->limit);
#if defined(_WIN32) || defined(_WIN64)
if (map->section)
NtClose(map->section);
@ -1617,6 +1620,10 @@ MDBX_INTERNAL_FUNC int mdbx_mresize(const int flags, mdbx_mmap_t *map,
if ((flags & MDBX_MRESIZE_MAY_UNMAP) == 0)
return MDBX_RESULT_TRUE;
/* Unpoisoning is required for ASAN to avoid false-positive diagnostic
* when this memory will re-used by malloc or another mmapping.
* See https://github.com/erthink/libmdbx/pull/93#issuecomment-613687203 */
ASAN_UNPOISON_MEMORY_REGION(map->address, map->limit);
status = NtUnmapViewOfSection(GetCurrentProcess(), map->address);
if (!NT_SUCCESS(status))
return ntstatus2errcode(status);
@ -1747,11 +1754,25 @@ retry_mapview:;
if (map->current != size)
rc =
(size > map->current) ? MDBX_UNABLE_EXTEND_MAPSIZE : MDBX_RESULT_TRUE;
} else if (map->filesize != size) {
rc = mdbx_ftruncate(map->fd, size);
if (rc != MDBX_SUCCESS)
return rc;
map->filesize = size;
} else {
if (map->filesize != size) {
rc = mdbx_ftruncate(map->fd, size);
if (rc != MDBX_SUCCESS)
return rc;
map->filesize = size;
}
if (map->current > size) {
/* Clearing asan's bitmask for the region which released in shrinking,
* since:
* - after the shrinking we will get an exception when accessing
* this region and (therefore) do not need the help of ASAN.
* - this allows us to clear the mask only within the file size
* when closing the mapping. */
ASAN_UNPOISON_MEMORY_REGION(
(char *)map->address + size,
((map->current < map->limit) ? map->current : map->limit) - size);
}
map->current = size;
}
@ -1864,7 +1885,9 @@ retry_mapview:;
* when this memory will re-used by malloc or another mmapping.
* See https://github.com/erthink/libmdbx/pull/93#issuecomment-613687203
*/
ASAN_UNPOISON_MEMORY_REGION(map->address, map->limit);
ASAN_UNPOISON_MEMORY_REGION(map->address, (map->current < map->limit)
? map->current
: map->limit);
map->limit = 0;
map->current = 0;
map->address = nullptr;
@ -1880,9 +1903,9 @@ retry_mapview:;
VALGRIND_MAKE_MEM_NOACCESS(map->address, map->current);
/* Unpoisoning is required for ASAN to avoid false-positive diagnostic
* when this memory will re-used by malloc or another mmapping.
* See https://github.com/erthink/libmdbx/pull/93#issuecomment-613687203
*/
ASAN_UNPOISON_MEMORY_REGION(map->address, map->limit);
* See https://github.com/erthink/libmdbx/pull/93#issuecomment-613687203 */
ASAN_UNPOISON_MEMORY_REGION(
map->address, (map->current < map->limit) ? map->current : map->limit);
VALGRIND_MAKE_MEM_DEFINED(ptr, map->current);
ASAN_UNPOISON_MEMORY_REGION(ptr, map->current);