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debug/dwarf: don't crash on invalid range/rnglist offset

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No test case because the problem can only happen for invalid data. Let
the fuzzer find cases like this.

Fixes #53529

Change-Id: I318c87795e545fe5a006d16b4d361cd4bf5d502d
Reviewed-on: https://go-review.googlesource.com/c/go/+/434936
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
This commit is contained in:
Ian Lance Taylor 2022-09-26 18:24:03 -07:00 committed by Gopher Robot
parent d9d2ef991c
commit c929a5b855
1 changed files with 7 additions and 0 deletions
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7
src/debug/dwarf/entry.go
View file

@ -13,6 +13,7 @@ package dwarf
import (
"encoding/binary"
"errors"
"fmt"
"strconv"
)
@ -1103,6 +1104,9 @@ func (d *Data) baseAddressForEntry(e *Entry) (*Entry, uint64, error) {
}
func (d *Data) dwarf2Ranges(u *unit, base uint64, ranges int64, ret [][2]uint64) ([][2]uint64, error) {
if ranges > int64(len(d.ranges)) {
return nil, fmt.Errorf("invalid range offset %d (max %d)", ranges, len(d.ranges))
}
buf := makeBuf(d, u, "ranges", Offset(ranges), d.ranges[ranges:])
for len(buf.data) > 0 {
low := buf.addr()
@ -1125,6 +1129,9 @@ func (d *Data) dwarf2Ranges(u *unit, base uint64, ranges int64, ret [][2]uint64)
// dwarf5Ranges interprets a debug_rnglists sequence, see DWARFv5 section
// 2.17.3 (page 53).
func (d *Data) dwarf5Ranges(u *unit, cu *Entry, base uint64, ranges int64, ret [][2]uint64) ([][2]uint64, error) {
if ranges > int64(len(d.rngLists)) {
return nil, fmt.Errorf("invalid rnglist offset %d (max %d)", ranges, len(d.ranges))
}
var addrBase int64
if cu != nil {
addrBase, _ = cu.Val(AttrAddrBase).(int64)