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fix false positives from valgrind in rptest

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daan 2022-10-30 10:45:51 -07:00
parent a1f5a5d962
commit 84c706508c
6 changed files with 40 additions and 26 deletions
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2
include/mimalloc-track.h
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@ -20,7 +20,7 @@ terms of the MIT license. A copy of the license can be found in the file
#include <valgrind/valgrind.h>
#include <valgrind/memcheck.h>
#define mi_track_malloc(p,size,zero) VALGRIND_MALLOCLIKE_BLOCK(p,size,MI_PADDING_SIZE /*red zone*/,(zero?1:0))
#define mi_track_malloc(p,size,zero) VALGRIND_MALLOCLIKE_BLOCK(p,size,MI_PADDING_SIZE /*red zone*/,zero)
#define mi_track_resize(p,oldsize,newsize) VALGRIND_RESIZEINPLACE_BLOCK(p,oldsize,newsize,MI_PADDING_SIZE /*red zone*/)
#define mi_track_free(p) VALGRIND_FREELIKE_BLOCK(p,MI_PADDING_SIZE /*red zone*/)
#define mi_track_mem_defined(p,size) VALGRIND_MAKE_MEM_DEFINED(p,size)

2
include/mimalloc-types.h
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@ -66,7 +66,7 @@ terms of the MIT license. A copy of the license can be found in the file
// Encoded free lists allow detection of corrupted free lists
// and can detect buffer overflows, modify after free, and double `free`s.
#if (MI_SECURE>=3 || MI_DEBUG>=1 || MI_PADDING > 0)
#if (MI_SECURE>=3 || MI_DEBUG>=1 || MI_PADDING > 0) && !MI_VALGRIND
#define MI_ENCODE_FREELIST 1
#endif

2
src/alloc-aligned.c
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@ -42,8 +42,10 @@ static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_fallback(mi_heap_t*
mi_assert_internal(((uintptr_t)aligned_p + offset) % alignment == 0);
mi_assert_internal(p == _mi_page_ptr_unalign(_mi_ptr_segment(aligned_p), _mi_ptr_page(aligned_p), aligned_p));
if (p != aligned_p) {
mi_track_free(p);
mi_track_malloc(aligned_p,size,zero);
}
return aligned_p;
}

10
src/alloc-override.c
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@ -29,7 +29,7 @@ typedef struct mi_nothrow_s { int _tag; } mi_nothrow_t;
// Override system malloc
// ------------------------------------------------------
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__APPLE__) && !defined(MI_VALGRIND)
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__APPLE__) && !MI_TRACK_ENABLED
// gcc, clang: use aliasing to alias the exported function to one of our `mi_` functions
#if (defined(__GNUC__) && __GNUC__ >= 9)
#pragma GCC diagnostic ignored "-Wattributes" // or we get warnings that nodiscard is ignored on a forward
@ -123,10 +123,10 @@ typedef struct mi_nothrow_s { int _tag; } mi_nothrow_t;
// we just override new/delete which does work in a static library.
#else
// On all other systems forward to our API
void* malloc(size_t size) MI_FORWARD1(mi_malloc, size)
void* calloc(size_t size, size_t n) MI_FORWARD2(mi_calloc, size, n)
void* realloc(void* p, size_t newsize) MI_FORWARD2(mi_realloc, p, newsize)
void free(void* p) MI_FORWARD0(mi_free, p)
mi_decl_export void* malloc(size_t size) MI_FORWARD1(mi_malloc, size)
mi_decl_export void* calloc(size_t size, size_t n) MI_FORWARD2(mi_calloc, size, n)
mi_decl_export void* realloc(void* p, size_t newsize) MI_FORWARD2(mi_realloc, p, newsize)
mi_decl_export void free(void* p) MI_FORWARD0(mi_free, p)
#endif
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__APPLE__)

27
src/alloc.c
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@ -42,18 +42,20 @@ extern inline void* _mi_page_malloc(mi_heap_t* heap, mi_page_t* page, size_t siz
// todo: can we optimize this call away for non-zero'd release mode?
#if MI_TRACK_ENABLED
const size_t track_bsize = mi_page_block_size(page);
if (zero) mi_track_mem_defined(block,track_bsize); else mi_track_mem_undefined(block,track_bsize);
mi_assert_internal(track_bsize >= size);
mi_track_mem_undefined(block,track_bsize - MI_PADDING_SIZE);
#endif
// zero the block? note: we need to zero the full block size (issue #63)
if mi_unlikely(zero) {
mi_assert_internal(page->xblock_size != 0); // do not call with zero'ing for huge blocks (see _mi_malloc_generic)
const size_t zsize = (page->is_zero ? sizeof(block->next) : page->xblock_size);
_mi_memzero_aligned(block, zsize);
const size_t zsize = (page->is_zero ? sizeof(block->next) + MI_PADDING_SIZE : page->xblock_size);
mi_assert(zsize <= track_bsize && zsize >= MI_PADDING_SIZE);
_mi_memzero_aligned(block, zsize - MI_PADDING_SIZE);
}
#if (MI_DEBUG>0)
if (!page->is_zero && !zero) { memset(block, MI_DEBUG_UNINIT, size); }
if (!page->is_zero && !zero) { memset(block, MI_DEBUG_UNINIT, size - MI_PADDING_SIZE); }
#elif (MI_SECURE!=0)
if (!zero) { block->next = 0; } // don't leak internal data
#endif
@ -70,7 +72,7 @@ extern inline void* _mi_page_malloc(mi_heap_t* heap, mi_page_t* page, size_t siz
}
#endif
#if (MI_PADDING > 0) && defined(MI_ENCODE_FREELIST)
#if (MI_PADDING > 0) && defined(MI_ENCODE_FREELIST) && !MI_TRACK_ENABLED
mi_padding_t* const padding = (mi_padding_t*)((uint8_t*)block + mi_page_usable_block_size(page));
ptrdiff_t delta = ((uint8_t*)padding - (uint8_t*)block - (size - MI_PADDING_SIZE));
#if (MI_DEBUG>1)
@ -85,7 +87,10 @@ extern inline void* _mi_page_malloc(mi_heap_t* heap, mi_page_t* page, size_t siz
#endif
// mark as no-access again
mi_track_mem_noaccess(block,track_bsize);
// mi_track_mem_noaccess(block, track_bsize);
// mi_track_resize(block,track_bsize,size - MI_PADDING_SIZE);
// mi_track_free(block);
//mi_track_malloc(block,size - MI_PADDING_SIZE,zero);
return block;
}
@ -217,7 +222,7 @@ static inline bool mi_check_is_double_free(const mi_page_t* page, const mi_block
// Check for heap block overflow by setting up padding at the end of the block
// ---------------------------------------------------------------------------
#if (MI_PADDING>0) && defined(MI_ENCODE_FREELIST)
#if (MI_PADDING>0) && defined(MI_ENCODE_FREELIST) && !MI_TRACK_ENABLED
static bool mi_page_decode_padding(const mi_page_t* page, const mi_block_t* block, size_t* delta, size_t* bsize) {
*bsize = mi_page_usable_block_size(page);
const mi_padding_t* const padding = (mi_padding_t*)((uint8_t*)block + *bsize);
@ -421,7 +426,7 @@ static inline void _mi_free_block(mi_page_t* page, bool local, mi_block_t* block
// owning thread can free a block directly
if mi_unlikely(mi_check_is_double_free(page, block)) return;
mi_check_padding(page, block);
#if (MI_DEBUG!=0)
#if (MI_DEBUG!=0) && !MI_TRACK_ENABLED
mi_track_mem_undefined(block, mi_page_block_size(page)); // note: check padding may set parts to noaccess
memset(block, MI_DEBUG_FREED, mi_page_block_size(page));
#endif
@ -453,13 +458,11 @@ mi_block_t* _mi_page_ptr_unalign(const mi_segment_t* segment, const mi_page_t* p
static void mi_decl_noinline mi_free_generic(const mi_segment_t* segment, bool local, void* p) mi_attr_noexcept {
mi_page_t* const page = _mi_segment_page_of(segment, p);
mi_block_t* const block = (mi_page_has_aligned(page) ? _mi_page_ptr_unalign(segment, page, p) : (mi_block_t*)p);
//#if MI_TRACK_ENABLED
//const size_t track_bsize = mi_page_block_size(page);
//#endif
const size_t track_bsize = mi_page_block_size(page);
//mi_track_mem_defined(block,track_bsize);
mi_stat_free(page, block); // stat_free may access the padding
_mi_free_block(page, local, block);
//mi_track_mem_noaccess(block,track_bsize); // use track_bsize as the page may have been deallocated by now
//mi_track_mem_noaccess(block,track_bsize);
}
// Get the segment data belonging to a pointer

11
test/test-wrong.c
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@ -10,14 +10,22 @@
int main(int argc, char** argv) {
int* p = mi(malloc)(3*sizeof(int));
int* q = mi(malloc)(sizeof(int));
int* r = mi_malloc_aligned(8,16);
mi_free(r);
// illegal byte wise read
char* c = (char*)mi(malloc)(3);
printf("invalid byte: over: %d, under: %d\n", c[4], c[-1]);
mi(free)(c);
// undefined access
int* q = mi(malloc)(sizeof(int));
printf("undefined: %d\n", *q);
// illegal int read
printf("invalid: over: %d, under: %d\n", q[1], q[-1]);
*q = 42;
// buffer overflow
@ -28,6 +36,7 @@ int main(int argc, char** argv) {
mi(free)(q);
// double free
mi(free)(q);