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stronger secure mode when defining MI_SECURE=4: checks for double free, corrupted free list, and invalid pointer frees. Performance is impacted but not too much -- more perf testing is needed

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daan 2019-10-18 18:11:04 -07:00
parent fdfa6ed260
commit 2affdbbd2e
8 changed files with 121 additions and 20 deletions
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20
test/main-override-static.c
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@ -2,12 +2,16 @@
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <stdint.h>
#include <mimalloc.h>
#include <mimalloc-override.h> // redefines malloc etc.
static void double_free();
int main() {
mi_version();
double_free();
void* p1 = malloc(78);
void* p2 = malloc(24);
free(p1);
@ -29,3 +33,19 @@ int main() {
mi_stats_print(NULL);
return 0;
}
static void double_free() {
void* p[256];
uintptr_t buf[256];
p[0] = mi_malloc(622616);
p[1] = mi_malloc(655362);
p[2] = mi_malloc(786432);
mi_free(p[2]);
// [VULN] Double free
mi_free(p[2]);
p[3] = mi_malloc(786456);
// [BUG] Found overlap
// p[3]=0x429b2ea2000 (size=917504), p[1]=0x429b2e42000 (size=786432)
fprintf(stderr, "p3: %p-%p, p1: %p-%p, p2: %p\n", p[3], (uint8_t*)(p[3]) + 786456, p[1], (uint8_t*)(p[1]) + 655362, p[2]);
}

6
test/main-override.cpp
View file

@ -2,10 +2,13 @@
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <stdint.h>
#include <mimalloc.h>
#include <new>
static void double_free();
static void* p = malloc(8);
void free_p() {
@ -24,6 +27,7 @@ public:
int main() {
//mi_stats_reset(); // ignore earlier allocations
double_free();
atexit(free_p);
void* p1 = malloc(78);
void* p2 = mi_malloc_aligned(16,24);
@ -66,3 +70,5 @@ public:
};
static Static s = Static();