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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 internal zero-initialized data
structures (relevant to tcache and prof code).
This commit is contained in:
Jason Evans
2013-10-19 23:48:40 -07:00
parent ff08ef7046
commit dda90f59e2
3 changed files with 25 additions and 9 deletions
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23
src/arena.c
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@@ -368,14 +368,21 @@ arena_run_zero(arena_chunk_t *chunk, size_t run_ind, size_t npages)
(npages << LG_PAGE));
}
static inline void
arena_run_page_mark_zeroed(arena_chunk_t *chunk, size_t run_ind)
{
VALGRIND_MAKE_MEM_DEFINED((void *)((uintptr_t)chunk + (run_ind <<
LG_PAGE)), PAGE);
}
static inline void
arena_run_page_validate_zeroed(arena_chunk_t *chunk, size_t run_ind)
{
size_t i;
UNUSED size_t *p = (size_t *)((uintptr_t)chunk + (run_ind << LG_PAGE));
VALGRIND_MAKE_MEM_DEFINED((void *)((uintptr_t)chunk + (run_ind <<
LG_PAGE)), PAGE);
arena_run_page_mark_zeroed(chunk, run_ind);
for (i = 0; i < PAGE / sizeof(size_t); i++)
assert(p[i] == 0);
}
@@ -458,6 +465,9 @@ arena_run_split(arena_t *arena, arena_run_t *run, size_t size, bool large,
} else if (config_debug) {
arena_run_page_validate_zeroed(
chunk, run_ind+i);
} else {
arena_run_page_mark_zeroed(
chunk, run_ind+i);
}
}
} else {
@@ -467,6 +477,9 @@ arena_run_split(arena_t *arena, arena_run_t *run, size_t size, bool large,
*/
arena_run_zero(chunk, run_ind, need_pages);
}
} else {
VALGRIND_MAKE_MEM_UNDEFINED((void *)((uintptr_t)chunk +
(run_ind << LG_PAGE)), (need_pages << LG_PAGE));
}
/*
@@ -508,9 +521,9 @@ arena_run_split(arena_t *arena, arena_run_t *run, size_t size, bool large,
arena_run_page_validate_zeroed(chunk,
run_ind+need_pages-1);
}
VALGRIND_MAKE_MEM_UNDEFINED((void *)((uintptr_t)chunk +
(run_ind << LG_PAGE)), (need_pages << LG_PAGE));
}
VALGRIND_MAKE_MEM_UNDEFINED((void *)((uintptr_t)chunk + (run_ind <<
LG_PAGE)), (need_pages << LG_PAGE));
}
static arena_chunk_t *
@@ -1465,6 +1478,7 @@ arena_malloc_small(arena_t *arena, size_t size, bool zero)
} else if (opt_zero)
memset(ret, 0, size);
}
VALGRIND_MAKE_MEM_UNDEFINED(ret, size);
} else {
if (config_fill && opt_junk) {
arena_alloc_junk_small(ret, &arena_bin_info[binind],
@@ -1473,7 +1487,6 @@ arena_malloc_small(arena_t *arena, size_t size, bool zero)
VALGRIND_MAKE_MEM_UNDEFINED(ret, size);
memset(ret, 0, size);
}
VALGRIND_MAKE_MEM_UNDEFINED(ret, size);
return (ret);
}