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| author | Ian Lance Taylor <iant@golang.org> | 2022-10-10 14:07:10 -0700 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2022-10-12 23:06:08 +0000 |
| commit | 0ae042f977942a60d7955bc10bf654835e47e12a (patch) | |
| tree | ee0d0b2a73008be27f6a88b32ad666d66d4e1597 /src/debug/elf | |
| parent | 79d0d330a9340d9e3ccb331660eb74f30e2edd01 (diff) | |
| download | go-0ae042f977942a60d7955bc10bf654835e47e12a.tar.xz | |
debug/elf: validate phentsize and shentsize
No test case because the problem can only happen for invalid data. Let
the fuzzer find cases like this.
Fixes #56129
Change-Id: I6c81933781384c5e2c8ba0fd99cec50455b9664a
Reviewed-on: https://go-review.googlesource.com/c/go/+/441976
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Joedian Reid <joedian@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Diffstat (limited to 'src/debug/elf')
| -rw-r--r-- | src/debug/elf/file.go | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/debug/elf/file.go b/src/debug/elf/file.go index 83a3cbc0b8..d181d340ec 100644 --- a/src/debug/elf/file.go +++ b/src/debug/elf/file.go @@ -344,6 +344,19 @@ func NewFile(r io.ReaderAt) (*File, error) { return nil, &FormatError{0, "invalid ELF shstrndx", shstrndx} } + var wantPhentsize, wantShentsize int + switch f.Class { + case ELFCLASS32: + wantPhentsize = 8 * 4 + wantShentsize = 10 * 4 + case ELFCLASS64: + wantPhentsize = 2*4 + 6*8 + wantShentsize = 4*4 + 6*8 + } + if phnum > 0 && phentsize < wantPhentsize { + return nil, &FormatError{0, "invalid ELF phentsize", phentsize} + } + // Read program headers f.Progs = make([]*Prog, phnum) for i := 0; i < phnum; i++ { @@ -439,6 +452,10 @@ func NewFile(r io.ReaderAt) (*File, error) { } } + if shnum > 0 && shentsize < wantShentsize { + return nil, &FormatError{0, "invalid ELF shentsize", shentsize} + } + // Read section headers f.Sections = make([]*Section, shnum) names := make([]uint32, shnum) |