diff options
Diffstat (limited to 'common/mcheck_core.inc.h')
| -rw-r--r-- | common/mcheck_core.inc.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/common/mcheck_core.inc.h b/common/mcheck_core.inc.h index b038bb0..85a34de 100644 --- a/common/mcheck_core.inc.h +++ b/common/mcheck_core.inc.h @@ -30,6 +30,8 @@ * Unlike glibc-clients, U-Boot has limited malloc-usage, and only one thread. * So it's better to make the protection heavier. * Thus overflow canary here is greater, than glibc's one. Underflow canary is bigger too. + * U-Boot also allows to use fixed-size heap-registry, instead of double-linked list in glibc. + * * Heavy canary allows to catch not only memset(..)-errors, * but overflow/underflow of struct-array access: * { @@ -61,8 +63,14 @@ #define FREEFLOOD ((char)0xf5) #define PADDINGFLOOD ((char)0x58) +// my normal run demands 4427-6449 chunks: +#define REGISTRY_SZ 6608 #define CANARY_DEPTH 2 +// avoid problems with BSS at early stage: +static char mcheck_pedantic_flag __section(".data") = 0; +static void *mcheck_registry[REGISTRY_SZ] __section(".data") = {0}; + typedef unsigned long long mcheck_elem; typedef struct { mcheck_elem elems[CANARY_DEPTH]; @@ -159,6 +167,12 @@ static void *mcheck_free_helper(void *ptr, int clean_content) if (clean_content) mcheck_flood(ptr, FREEFLOOD, mcheck_allign_customer_size(hdr->size)); + for (i = 0; i < REGISTRY_SZ; ++i) + if (mcheck_registry[i] == hdr) { + mcheck_registry[i] = 0; + break; + } + return (char *)hdr - hdr->aln_skip; } @@ -197,6 +211,17 @@ static void *mcheck_allocated_helper(void *altoghether_ptr, size_t customer_sz, for (i = 0; i < CANARY_DEPTH; ++i) tail->elems[i] = MAGICTAIL; + + for (i = 0; i < REGISTRY_SZ; ++i) + if (!mcheck_registry[i]) { + mcheck_registry[i] = hdr; + return payload; // normal end + } + + static char *overflow_msg = "\n\n\nERROR: mcheck registry overflow, pedantic check would be incomplete!!\n\n\n\n"; + + printf("%s", overflow_msg); + overflow_msg = "(mcheck registry full)"; return payload; } @@ -227,9 +252,25 @@ static enum mcheck_status mcheck_mprobe(void *ptr) return mcheck_checkhdr(hdr); } +static void mcheck_pedantic_check(void) +{ + int i; + + for (i = 0; i < REGISTRY_SZ; ++i) + if (mcheck_registry[i]) + mcheck_checkhdr(mcheck_registry[i]); +} + +static void mcheck_pedantic_prehook(void) +{ + if (mcheck_pedantic_flag) + mcheck_pedantic_check(); +} + static void mcheck_initialize(mcheck_abortfunc_t new_func, char pedantic_flag) { mcheck_abortfunc = (new_func) ? new_func : &mcheck_default_abort; + mcheck_pedantic_flag = pedantic_flag; } #endif |