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debug/pe: handle files with no string table

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pecoff.doc (https://goo.gl/ayvckk) in section 5.6 says:

Immediately following the COFF symbol table is the COFF string table.
The position of this table is found by taking the symbol table address
in the COFF header, and adding the number of symbols multiplied by
the size of a symbol.

So it is unclear what to do when symbol table address is 0.
Lets assume executable does not have any string table.

Added new test with executable with no symbol table. The

gcc -s testdata\hello.c -o testdata\gcc-386-mingw-no-symbols-exec.

command was used to generate the executable.

Fixes #16084

Change-Id: Ie74137ac64b15daadd28e1f0315f3b62d1bf2059
Reviewed-on: https://go-review.googlesource.com/24200
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Alex Brainman 2016-06-17 14:05:35 +10:00
parent f3d54789f7
commit 691c5c1568
3 changed files with 38 additions and 0 deletions
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35
src/debug/pe/file_test.go
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@ -104,6 +104,41 @@ var fileTests = []fileTest{
{".debug_loc", 0x38, 0xf000, 0x200, 0x3a00, 0x0, 0x0, 0x0, 0x0, 0x42100000},
},
},
{
file: "testdata/gcc-386-mingw-no-symbols-exec",
hdr: FileHeader{0x14c, 0x8, 0x69676572, 0x0, 0x0, 0xe0, 0x30f},
opthdr: &OptionalHeader32{0x10b, 0x2, 0x18, 0xe00, 0x1e00, 0x200, 0x1280, 0x1000, 0x2000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x1, 0x0, 0x4, 0x0, 0x0, 0x9000, 0x400, 0x5306, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10,
[16]DataDirectory{
{0x0, 0x0},
{0x6000, 0x378},
{0x0, 0x0},
{0x0, 0x0},
{0x0, 0x0},
{0x0, 0x0},
{0x0, 0x0},
{0x0, 0x0},
{0x0, 0x0},
{0x8004, 0x18},
{0x0, 0x0},
{0x0, 0x0},
{0x60b8, 0x7c},
{0x0, 0x0},
{0x0, 0x0},
{0x0, 0x0},
},
},
sections: []*SectionHeader{
{".text", 0xc64, 0x1000, 0xe00, 0x400, 0x0, 0x0, 0x0, 0x0, 0x60500060},
{".data", 0x10, 0x2000, 0x200, 0x1200, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
{".rdata", 0x134, 0x3000, 0x200, 0x1400, 0x0, 0x0, 0x0, 0x0, 0x40300040},
{".eh_fram", 0x3a0, 0x4000, 0x400, 0x1600, 0x0, 0x0, 0x0, 0x0, 0x40300040},
{".bss", 0x60, 0x5000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0300080},
{".idata", 0x378, 0x6000, 0x400, 0x1a00, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
{".CRT", 0x18, 0x7000, 0x200, 0x1e00, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
{".tls", 0x20, 0x8000, 0x200, 0x2000, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
},
hasNoDwarfInfo: true,
},
{
file: "testdata/gcc-amd64-mingw-obj",
hdr: FileHeader{0x8664, 0x6, 0x0, 0x198, 0x12, 0x0, 0x4},

3
src/debug/pe/string.go
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@ -24,6 +24,9 @@ type _StringTable []byte
func readStringTable(fh *FileHeader, r io.ReadSeeker) (_StringTable, error) {
// COFF string table is located right after COFF symbol table.
if fh.PointerToSymbolTable <= 0 {
return nil, nil
}
offset := fh.PointerToSymbolTable + COFFSymbolSize*fh.NumberOfSymbols
_, err := r.Seek(int64(offset), io.SeekStart)
if err != nil {

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src/debug/pe/testdata/gcc-386-mingw-no-symbols-exec vendored Normal file
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