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author | Damien Neil <dneil@google.com> | 2023-03-22 09:33:22 -0700 |
---|---|---|
committer | Gopher Robot <gobot@golang.org> | 2023-04-04 16:47:49 +0000 |
commit | 126a1d02da82f93ede7ce0bd8d3c51ef627f2104 (patch) | |
tree | ec8781ec9aae95ca1c524b7efd8eef71a25e5cbf | |
parent | 7917b5f31204528ea72e0629f0b7d52b35b27538 (diff) | |
download | go-126a1d02da82f93ede7ce0bd8d3c51ef627f2104.tar.gz go-126a1d02da82f93ede7ce0bd8d3c51ef627f2104.zip |
[release-branch.go1.19] go/scanner: reject large line and column numbers in //line directives
Setting a large line or column number using a //line directive can cause
integer overflow even in small source files.
Limit line and column numbers in //line directives to 2^30-1, which
is small enough to avoid int32 overflow on all reasonbly-sized files.
Fixes CVE-2023-24537
Fixes #59273
For #59180
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1802456
Reviewed-by: Julie Qiu <julieqiu@google.com>
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1802611
Reviewed-by: Damien Neil <dneil@google.com>
Change-Id: Ifdfa192d54f722d781a4d8c5f35b5fb72d122168
Reviewed-on: https://go-review.googlesource.com/c/go/+/481986
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
-rw-r--r-- | src/go/parser/parser_test.go | 16 | ||||
-rw-r--r-- | src/go/scanner/scanner.go | 7 |
2 files changed, 21 insertions, 2 deletions
diff --git a/src/go/parser/parser_test.go b/src/go/parser/parser_test.go index 0c278924c9..15b265ffc3 100644 --- a/src/go/parser/parser_test.go +++ b/src/go/parser/parser_test.go @@ -742,3 +742,19 @@ func TestScopeDepthLimit(t *testing.T) { } } } + +// TestIssue59180 tests that line number overflow doesn't cause an infinite loop. +func TestIssue59180(t *testing.T) { + testcases := []string{ + "package p\n//line :9223372036854775806\n\n//", + "package p\n//line :1:9223372036854775806\n\n//", + "package p\n//line file:9223372036854775806\n\n//", + } + + for _, src := range testcases { + _, err := ParseFile(token.NewFileSet(), "", src, ParseComments) + if err == nil { + t.Errorf("ParseFile(%s) succeeded unexpectedly", src) + } + } +} diff --git a/src/go/scanner/scanner.go b/src/go/scanner/scanner.go index 07e07581f7..6a7e30bb2f 100644 --- a/src/go/scanner/scanner.go +++ b/src/go/scanner/scanner.go @@ -246,13 +246,16 @@ func (s *Scanner) updateLineInfo(next, offs int, text []byte) { return } + // Put a cap on the maximum size of line and column numbers. + // 30 bits allows for some additional space before wrapping an int32. + const maxLineCol = 1<<30 - 1 var line, col int i2, n2, ok2 := trailingDigits(text[:i-1]) if ok2 { //line filename:line:col i, i2 = i2, i line, col = n2, n - if col == 0 { + if col == 0 || col > maxLineCol { s.error(offs+i2, "invalid column number: "+string(text[i2:])) return } @@ -262,7 +265,7 @@ func (s *Scanner) updateLineInfo(next, offs int, text []byte) { line = n } - if line == 0 { + if line == 0 || line > maxLineCol { s.error(offs+i, "invalid line number: "+string(text[i:])) return } |