func mustAddExtra(prefix string, scanner *bufio.Scanner, ci *crash.Info, die func()) {
scanner.Scan()
if !strings.HasPrefix(scanner.Text(), prefix) {
die()
}
ci.Extra = append(ci.Extra, scanner.Text())
}
func parse(raw []byte, cmd string) crash.Info {
// this just prettifies the rest of the parsers slightly
die := func() {
explode(raw, cmd)
}
ci := crash.Info{}
ci.Registers = parseRegisters(raw, die)
parseStack(raw, &ci, die)
parseExploitable(raw, &ci, die)
ci.FaultingInsn, ci.Disassembly = parseDisasm(raw, die)
parseIndicators(raw, &ci, die)
return ci
}
func parseExploitable(raw []byte, ci *crash.Info, die func()) {
scanner := bufio.NewScanner(bytes.NewReader(raw))
// Faulting frame: # 4 None at 0x7ffff6fad93b in /usr/lib/x86_64-linux-gnu/libcairo.so.2.11301.0
// Faulting frame: # 6 operator new(unsigned long) at 0x7ffff6d87698 in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.20
// [ <---ignore---> ] [ symbol text until "at" ] [address] [ <-- module from here--> ]
mustAdvanceTo("Faulting frame:", scanner, die)
ff := strings.Fields(scanner.Text())
if len(ff) < 9 {
die()
}
atIdx := 0
for i := 0; i < len(ff); i++ {
if ff[i] == "at" {
atIdx = i
break
}
}
if atIdx == 0 {
die()
}
ci.FaultingFrame = crash.StackEntry{
Symbol: strings.Join(ff[4:atIdx], " "),
Address: mustParseHex(ff[atIdx+1], die),
// don't know if modules can ever contain spaces?
Module: strings.Join(ff[atIdx+3:], " "),
}
// Description: Abort signal
mustAddExtra("Description:", scanner, ci, die)
// Short description: AbortSignal (20/22)
mustAddExtra("Short description:", scanner, ci, die)
// Hash: 71c14ffe39944b60af6fd47d1e505f97.0822ff5e99ce7ad4a1e6e98b273082a7
mustAdvanceTo("Hash:", scanner, die)
ci.Hash = strings.Fields(scanner.Text())[1]
// Exploitability Classification: UNKNOWN
mustAdvanceTo("Exploitability", scanner, die)
ci.Classification = strings.Fields(scanner.Text())[2]
// Explanation: The target is stopped on a SIGABRT. [...]
mustAddExtra("Explanation:", scanner, ci, die)
return
}
func parse(raw []byte, cmd string) crash.Info {
// This is "inefficient", but I'm going to parse each thing I'm interested
// in out of the full output instead of doing a single pass.
// this just prettifies the rest of the parsers slightly
die := func() {
explode(raw, cmd)
}
ci := crash.Info{}
ci.Registers = parseRegisters(raw, die)
ci.Stack = parseStack(raw, die)
parseExploitable(raw, &ci, die) // easier for this one to modify ci directly
ci.FaultingInsn, ci.Disassembly = parseDisasm(raw, die)
return ci
}
func parseExploitable(raw []byte, ci *crash.Info, die func()) {
scanner := bufio.NewScanner(bytes.NewReader(raw))
for scanner.Scan() {
if strings.HasPrefix(scanner.Text(), "Hash:") {
ff := strings.Fields(scanner.Text())
if len(ff) < 2 {
die()
}
ci.Hash = ff[1]
break
}
}
}
func parseStack(raw []byte, ci *crash.Info, die func()) {
// Stack trace:
// * thread #1: tid = 0x9f2fa1f, 0x00007fff97580282 libsystem_kernel.dylib`__pthread_kill + 10, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
// * frame #0: 0x00007fff97580282 libsystem_kernel.dylib`__pthread_kill + 10
// frame #1: 0x00007fff8e3d54c3 libsystem_pthread.dylib`pthread_kill + 90
// frame #2: 0x00007fff97a4cb73 libsystem_c.dylib`abort + 129
// frame #3: 0x00000001000b4dc4 pdftoppm`Catalog::getNumPages() [inlined] Object::dictIs(this=0x0000000000000007, dictType=<unavailable>) - 18446744069413843515
// frame #4: 0x00000001000029c0 pdftoppm`main(argc=2, argv=<unavailable>) - 18446744069414573631
// frame #5: 0x00007fff9a2f35c9 libdyld.dylib`start + 1
// frame #6: 0x00007fff9a2f35c9 libdyld.dylib`start + 1
scanner := bufio.NewScanner(bytes.NewReader(raw))
mustAdvanceTo("Stack trace:", scanner, die)
scanner.Scan()
ff := strings.Fields(scanner.Text())
if len(ff) < 8 || ff[1] != "thread" {
die()
}
for scanner.Scan() {
// scan until we run out of frames
ff := strings.Fields(scanner.Text())
if len(ff) == 0 {
break
}
// A leading asterisk adjusts all our offsets by 1
adjust := 0
if ff[0] == "*" {
adjust++
}
if ff[0+adjust] != "frame" {
break
}
if len(ff) < 3 {
die()
}
var address uint64
var found bool
for _, s := range ff {
if strings.HasPrefix(s, "0x") {
address = mustParseHex(s, die)
found = true
}
}
if !found {
die()
}
splits := []string{"???", "???"}
if len(ff) > 3+adjust {
// split on backtick (`)
// libsystem_pthread.dylib`pthread_kill + 90
rest := strings.Join(ff[3+adjust:], " ")
splits = strings.SplitN(rest, "`", 2)
if len(splits) < 2 {
die()
}
}
entry := crash.StackEntry{
Address: address,
Module: splits[0],
Symbol: splits[1],
}
ci.Stack = append(ci.Stack, entry)
}
// Set the fault to the first frame that's not blacklisted
walk:
for _, frame := range ci.Stack {
for _, r := range blacklist {
if r.MatchString(frame.Module) {
continue walk
}
}
ci.FaultingFrame = frame
break
}
// don't be too fussy about not finding a stack, here, some crashes set
// those registers to values that are unreadable as addresses.
return
}