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- Use MAP_FAILED error code for check whether mmap() was successful

Browse source 
- Replace various malloc() with Z_Malloc
- Fix several memory leaks when VM compilation failed and Com_Error is called
- Make failed mmap/VirtualAlloc/malloc calls fatal
This commit is contained in:
Thilo Schulz 2011-02-10 18:45:28 +00:00
parent 5e0d0efd2e
commit 544a1c0c1a
5 changed files with 50 additions and 27 deletions
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2
code/qcommon/vm_powerpc.c
View file

@ -1837,7 +1837,7 @@ PPC_ComputeCode( vm_t *vm )
unsigned char *dataAndCode = mmap( NULL, codeLength,
PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0 );
if ( ! dataAndCode )
if (dataAndCode == MAP_FAILED)
DIE( "Not enough memory" );
ppc_instruction_t *codeNow, *codeBegin;

2
code/qcommon/vm_sparc.c
View file

@ -1427,7 +1427,7 @@ static void sparc_compute_code(vm_t *vm, struct func_info * const fp)
data_and_code = mmap(NULL, code_length, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
if (!data_and_code)
if (data_and_code == MAP_FAILED)
DIE("Not enough memory");
code_now = code_begin = (unsigned int *)

33
code/qcommon/vm_x86.c
View file

@ -53,6 +53,7 @@ static void VM_Destroy_Compiled(vm_t* self);
*/
#define VMFREE_BUFFERS() {Z_Free(buf); Z_Free(jused);}
static byte *buf = NULL;
static byte *jused = NULL;
static int compiledOfs = 0;
@ -289,6 +290,7 @@ static int Hex( int c ) {
return c - '0';
}
VMFREE_BUFFERS();
Com_Error( ERR_DROP, "Hex: bad char '%c'", c );
return 0;
@ -408,6 +410,7 @@ qboolean EmitMovEBXEDI(vm_t *vm, int andit) {
#define JUSED(x) \
do { \
if (x < 0 || x >= jusedSize) { \
VMFREE_BUFFERS(); \
Com_Error( ERR_DROP, \
"VM_CompileX86: jump target out of range at offset %d", pc ); \
} \
@ -429,7 +432,7 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
// allocate a very large temp buffer, we will shrink it later
maxLength = header->codeLength * 8;
buf = Z_Malloc( maxLength );
buf = Z_Malloc(maxLength);
jused = Z_Malloc(jusedSize);
Com_Memset(jused, 0, jusedSize);
@ -454,16 +457,21 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
LastCommand = LAST_COMMAND_NONE;
while ( instruction < header->instructionCount ) {
if ( compiledOfs > maxLength - 16 ) {
Com_Error( ERR_FATAL, "VM_CompileX86: maxLength exceeded" );
while(instruction < header->instructionCount)
{
if(compiledOfs > maxLength - 16)
{
VMFREE_BUFFERS();
Com_Error(ERR_DROP, "VM_CompileX86: maxLength exceeded");
}
vm->instructionPointers[ instruction ] = compiledOfs;
instruction++;
if ( pc > header->codeLength ) {
Com_Error( ERR_FATAL, "VM_CompileX86: pc > header->codeLength" );
if(pc > header->codeLength)
{
VMFREE_BUFFERS();
Com_Error(ERR_DROP, "VM_CompileX86: pc > header->codeLength");
}
op = code[ pc ];
@ -1075,7 +1083,8 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
Emit4( (int)vm->instructionPointers );
break;
default:
Com_Error( ERR_DROP, "VM_CompileX86: bad opcode %i at offset %i", op, pc );
VMFREE_BUFFERS();
Com_Error(ERR_DROP, "VM_CompileX86: bad opcode %i at offset %i", op, pc);
}
pop0 = pop1;
pop1 = op;
@ -1086,13 +1095,13 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
vm->codeLength = compiledOfs;
#ifdef VM_X86_MMAP
vm->codeBase = mmap(NULL, compiledOfs, PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
if(vm->codeBase == (void*)-1)
Com_Error(ERR_DROP, "VM_CompileX86: can't mmap memory");
if(vm->codeBase == MAP_FAILED)
Com_Error(ERR_FATAL, "VM_CompileX86: can't mmap memory");
#elif _WIN32
// allocate memory with EXECUTE permissions under windows.
vm->codeBase = VirtualAlloc(NULL, compiledOfs, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if(!vm->codeBase)
Com_Error(ERR_DROP, "VM_CompileX86: VirtualAlloc failed");
Com_Error(ERR_FATAL, "VM_CompileX86: VirtualAlloc failed");
#else
vm->codeBase = malloc(compiledOfs);
#endif
@ -1101,14 +1110,14 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
#ifdef VM_X86_MMAP
if(mprotect(vm->codeBase, compiledOfs, PROT_READ|PROT_EXEC))
Com_Error(ERR_DROP, "VM_CompileX86: mprotect failed");
Com_Error(ERR_FATAL, "VM_CompileX86: mprotect failed");
#elif _WIN32
{
DWORD oldProtect = 0;
// remove write permissions.
if(!VirtualProtect(vm->codeBase, compiledOfs, PAGE_EXECUTE_READ, &oldProtect))
Com_Error(ERR_DROP, "VM_CompileX86: VirtualProtect failed");
Com_Error(ERR_FATAL, "VM_CompileX86: VirtualProtect failed");
}
#endif

32
code/qcommon/vm_x86_64.c
View file

@ -54,6 +54,8 @@ static FILE* qdasmout;
#define Dfprintf(args...)
#endif
#define VM_FREEBUFFERS(vm) {assembler_init(0); VM_Destroy_Compiled(vm);}
void assembler_set_output(char* buf);
size_t assembler_get_code_size(void);
void assembler_init(int pass);
@ -251,6 +253,7 @@ void emit(const char* fmt, ...)
#define CHECK_INSTR(nr) \
do { if(nr < 0 || nr >= header->instructionCount) { \
VM_FREEBUFFERS(vm); \
Com_Error( ERR_DROP, \
"%s: jump target 0x%x out of range at offset %d", __func__, nr, pc ); \
} } while(0)
@ -430,6 +433,8 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
// const optimization
unsigned got_const = 0, const_value = 0;
vm->codeBase = NULL;
gettimeofday(&tvstart, NULL);
for (pass = 0; pass < 2; ++pass) {
@ -441,15 +446,17 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
#ifdef VM_X86_64_MMAP
vm->codeBase = mmap(NULL, compiledOfs, PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
if(vm->codeBase == (void*)-1)
Com_Error(ERR_DROP, "VM_CompileX86: can't mmap memory");
if(vm->codeBase == MAP_FAILED)
Com_Error(ERR_FATAL, "VM_CompileX86_64: can't mmap memory");
#elif __WIN64__
// allocate memory with write permissions under windows.
vm->codeBase = VirtualAlloc(NULL, compiledOfs, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
if(!vm->codeBase)
Com_Error(ERR_DROP, "VM_CompileX86: VirtualAlloc failed");
Com_Error(ERR_FATAL, "VM_CompileX86_64: VirtualAlloc failed");
#else
vm->codeBase = malloc(compiledOfs);
if(!vm_codeBase)
Com_Error(ERR_FATAL, "VM_CompileX86_64: Failed to allocate memory");
#endif
assembler_set_output((char*)vm->codeBase);
@ -930,7 +937,9 @@ emit_do_syscall:
}
if(got_const) {
if(got_const)
{
VM_FREEBUFFERS(vm);
Com_Error(ERR_DROP, "leftover const\n");
}
@ -943,14 +952,14 @@ emit_do_syscall:
#ifdef VM_X86_64_MMAP
if(mprotect(vm->codeBase, compiledOfs, PROT_READ|PROT_EXEC))
Com_Error(ERR_DROP, "VM_CompileX86: mprotect failed");
Com_Error(ERR_FATAL, "VM_CompileX86_64: mprotect failed");
#elif __WIN64__
{
DWORD oldProtect = 0;
// remove write permissions; give exec permision
if(!VirtualProtect(vm->codeBase, compiledOfs, PAGE_EXECUTE_READ, &oldProtect))
Com_Error(ERR_DROP, "VM_CompileX86: VirtualProtect failed");
Com_Error(ERR_FATAL, "VM_CompileX86_64: VirtualProtect failed");
}
#endif
@ -987,11 +996,16 @@ emit_do_syscall:
void VM_Destroy_Compiled(vm_t* self)
{
#ifdef _WIN32
VirtualFree(self->codeBase, 0, MEM_RELEASE);
if(self && self->codeBase)
{
#ifdef VM_X86_64_MMAP
munmap(self->codeBase, self->codeLength);
#elif __WIN64__
VirtualFree(self->codeBase, 0, MEM_RELEASE);
#else
munmap(self->codeBase, self->codeLength);
free(self->codeBase);
#endif
}
}
/*

8
code/qcommon/vm_x86_64_assembler.c
View file

@ -244,10 +244,10 @@ static void hash_add_label(const char* label, unsigned address)
int labellen;
i %= sizeof(labelhash)/sizeof(labelhash[0]);
h = malloc(sizeof(struct hashentry));
h = Z_Malloc(sizeof(struct hashentry));
labellen = strlen(label) + 1;
h->label = malloc(labellen);
h->label = Z_Malloc(labellen);
memcpy(h->label, label, labellen);
h->address = address;
@ -282,8 +282,8 @@ static void labelhash_free(void)
while(h)
{
struct hashentry* next = h->next;
free(h->label);
free(h);
Z_Free(h->label);
Z_Free(h);
h = next;
++n;
}