debug/buildinfo: oom in buildinfo.Read

[catenacyber]

What version of Go are you using (go version)?

$ go version
go version go1.17.6 darwin/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/catena/Library/Caches/go-build"
GOENV="/Users/catena/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/catena/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/catena/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.17.6"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/catena/go/src/github.com/catenacyber/go/src/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/pp/dc1dtf9x2js3v0jx_m010nqr0000gn/T/go-build4237848497=/tmp/go-build -gno-record-gcc-switches -fno-common"
GOROOT/bin/go version: go version go1.17.6 darwin/amd64
GOROOT/bin/go tool compile -V: compile version go1.17.6
uname -v: Darwin Kernel Version 21.3.0: Wed Jan  5 21:37:58 PST 2022; root:xnu-8019.80.24~20/RELEASE_X86_64
ProductName:    macOS
ProductVersion: 12.2.1
BuildVersion:   21D62
lldb --version: lldb-1316.0.9.41
Apple Swift version 5.6 (swiftlang-5.6.0.323.62 clang-1316.0.20.8)
gdb --version: GNU gdb (GDB) 9.1

What did you do?

Run https://go.dev/play/p/mzysSGc5TMs?v=gotip (not working on go 1.17 as this package did not exist yet)

What did you expect to see?

The program finishing and printing hello

What did you see instead?

Only

Program exited.

Found by https://github.com/catenacyber/ngolo-fuzzing on oss-fuzz https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46441

cc @ianlancetaylor

[thanm]

Headline says "OOM" -- do you have a heap profile you could share? Thanks.

[thanm]

do you have a heap profile you could share

Never mind, I can see the issue now:

Showing nodes accounting for 4011048.28kB, 100% of 4011052.89kB total
Dropped 47 nodes (cum <= 20055.26kB)
----------------------------------------------------------+-------------
      flat  flat%   sum%        cum   cum%   calls calls% + context          
----------------------------------------------------------+-------------
                                      4011048.59kB   100% |   debug/buildinfo.readRawBuildInfo
4011048.15kB   100%   100% 4011048.59kB   100%                | internal/xcoff.NewFile
----------------------------------------------------------+-------------

[gopherbot]

Change https://go.dev/cl/413875 mentions this issue: internal/xcoff: use saferio to read string table