diff options
Diffstat (limited to 'src/client/mac/handler')
| -rw-r--r-- | src/client/mac/handler/minidump_generator.cc | 56 | ||||
| -rw-r--r-- | src/client/mac/handler/minidump_generator.h | 3 |
2 files changed, 32 insertions, 27 deletions
diff --git a/src/client/mac/handler/minidump_generator.cc b/src/client/mac/handler/minidump_generator.cc index 4f388e6f..a7680c21 100644 --- a/src/client/mac/handler/minidump_generator.cc +++ b/src/client/mac/handler/minidump_generator.cc @@ -255,37 +255,45 @@ size_t MinidumpGenerator::CalculateStackSize(mach_vm_address_t start_addr) { kern_return_t result = mach_vm_region_recurse(crashing_task_, &stack_region_base, &stack_region_size, &nesting_level, - region_info, - &info_count); + region_info, &info_count); - if (start_addr < stack_region_base) { - // probably stack corruption, since mach_vm_region had to go + if (result != KERN_SUCCESS || start_addr < stack_region_base) { + // Failure or stack corruption, since mach_vm_region had to go // higher in the process address space to find a valid region. return 0; } - if (((cpu_type_ & CPU_ARCH_ABI64) && - (stack_region_base + stack_region_size) == TOP_OF_THREAD0_STACK_64BIT) || - (!(cpu_type_ & CPU_ARCH_ABI64) && - (stack_region_base + stack_region_size) == TOP_OF_THREAD0_STACK_32BIT)) { - // The stack for thread 0 needs to extend all the way to - // 0xc0000000 on 32 bit and 00007fff5fc00000 on 64bit. HOWEVER, - // for many processes, the stack is first created in one page - // below this, and is then later extended to a much larger size by - // creating a new VM region immediately below the initial page. - - // You can see this for yourself by running vmmap on a "hello, - // world" program - - // Because of the above, we'll add 4k to include the original - // stack frame page. - // This method of finding the stack region needs to be done in - // a better way; the breakpad issue 247 is tracking this. - stack_region_size += 0x1000; + unsigned int tag = submap_info.user_tag; + + // If the user tag is VM_MEMORY_STACK, look for more readable regions with + // the same tag placed immediately above the computed stack region. Under + // some circumstances, the stack for thread 0 winds up broken up into + // multiple distinct abutting regions. This can happen for several reasons, + // including user code that calls setrlimit(RLIMIT_STACK, ...) or changes + // the access on stack pages by calling mprotect. + if (tag == VM_MEMORY_STACK) { + while (true) { + mach_vm_address_t next_region_base = stack_region_base + + stack_region_size; + mach_vm_address_t proposed_next_region_base = next_region_base; + mach_vm_size_t next_region_size; + nesting_level = 0; + mach_msg_type_number_t info_count = VM_REGION_SUBMAP_INFO_COUNT_64; + result = mach_vm_region_recurse(crashing_task_, &next_region_base, + &next_region_size, &nesting_level, + region_info, &info_count); + if (result != KERN_SUCCESS || + next_region_base != proposed_next_region_base || + submap_info.user_tag != tag || + submap_info.protection & VM_PROT_READ == 0) { + break; + } + + stack_region_size += next_region_size; + } } - return result == KERN_SUCCESS ? - stack_region_base + stack_region_size - start_addr : 0; + return stack_region_base + stack_region_size - start_addr; } bool MinidumpGenerator::WriteStackFromStartAddress( diff --git a/src/client/mac/handler/minidump_generator.h b/src/client/mac/handler/minidump_generator.h index 55c4c8a3..6f9fe8f7 100644 --- a/src/client/mac/handler/minidump_generator.h +++ b/src/client/mac/handler/minidump_generator.h @@ -51,9 +51,6 @@ namespace google_breakpad { using std::string; -const u_int64_t TOP_OF_THREAD0_STACK_64BIT = 0x00007fff5fbff000LL; -const u_int32_t TOP_OF_THREAD0_STACK_32BIT = 0xbffff000; - // Use the REGISTER_FROM_THREADSTATE to access a register name from the // breakpad_thread_state_t structure. #if __DARWIN_UNIX03 || TARGET_CPU_X86_64 || TARGET_CPU_PPC64 |