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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__ */
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