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debug/dwarf: handle malformed line table with bad program offset

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Touch up the line table reader to ensure that it can detect and reject
an invalid program offset field in the table header.

Fixes #53329.

Change-Id: Ia8d684e909af3aca3014b4a3d0dfd431e3f5a9f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/413814
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Than McIntosh
2022-06-23 14:11:59 -04:00
parent 15605ca827
commit de5329f1de
1 changed files with 5 additions and 1 deletions
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6
src/debug/dwarf/line.go
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@@ -215,7 +215,11 @@ func (r *LineReader) readHeader(compDir string) error {
} else {
headerLength = Offset(buf.uint32())
}
r.programOffset = buf.off + headerLength
programOffset := buf.off + headerLength
if programOffset > r.endOffset {
return DecodeError{"line", hdrOffset, fmt.Sprintf("malformed line table: program offset %d exceeds end offset %d", programOffset, r.endOffset)}
}
r.programOffset = programOffset
r.minInstructionLength = int(buf.uint8())
if r.version >= 4 {
// [DWARF4 6.2.4]