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debug/elf: elf.Symbols() never populates Version or Library struct fields. #50625

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ok-john opened this issue Jan 15, 2022 · 1 comment
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debug/elf: elf.Symbols() never populates Version or Library struct fields. #50625

ok-john opened this issue Jan 15, 2022 · 1 comment
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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@ok-john
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ok-john commented Jan 15, 2022

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

go1.18-3b5eec9

Does this issue reproduce with the latest release?

Yes

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

linux/amd64

What did you do?

Viewed the elf.Symbol's in both cgo & go elf binaries. See here, the binaries I looked at are included in that repo.

Used ldd to confirm the binaries in question are static and dynamically linked, respectively.

Used readelf -{s, S} to confirm the cgo binary contains no dynamic symbol table unlike the regular go binary.

What did you expect to see?

Well I didn't really expect to see anything, just noticed this in passing & thought it was strange the fields never got populated. Peeking at the Symbol struct I noticed this comment which suggests the Version & Library fields would be populated in the .dynsym table but not in the .symtab table.

Poking around a bit more, looks like there is no attempt to populate either field. (ref)

What did you see instead?

Neither Version or Library populated for either symbol table/binary.
@gopherbot gopherbot added this to the Unreleased milestone Jan 15, 2022
@ok-john ok-john changed the title x/debug: elf.Symbols() never populates Version or Library struct fields. debug/elf: elf.Symbols() never populates Version or Library struct fields. Jan 15, 2022
@seankhliao seankhliao added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Jan 16, 2022
@ianlancetaylor
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The Version and Library fields are set by the DynamicSymbols method: https://go.dev/src/debug/elf/file.go?#L1273, but only if the file has version information. On a Linux system using glibc you will see version information if you use the DynamicSymbols method on libc itself.

In general, for questions about Go please use a forum rather than the issue tracker. Thanks. See https://golang.org/wiki/Questions.

@golang golang locked and limited conversation to collaborators Jan 16, 2023
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