oci: correctly use user.GetExecUser interface#41288
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A nil interface in Go is not the same as a nil pointer that satisfies
the interface. libcontainer/user has special handling for missing
/etc/{passwd,group} files but this is all based on nil interface checks,
which were broken by Docker's usage of the API.
When combined with some recent changes in runc that made read errors
actually be returned to the caller, this results in spurrious -EINVAL
errors when we should detect the situation as "there is no passwd file".
Signed-off-by: Aleksa Sarai <[email protected]>
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status/2-code-review
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kind/bugfix
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This was referenced Jul 29, 2020
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Also opened #41290 to refactor this somewhat |
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extracting this from #41178 as it's an existing bug. This patch was provided by @cyphar on opencontainers/runc#2275 (comment)
A nil interface in Go is not the same as a nil pointer that satisfies
the interface. libcontainer/user has special handling for missing
/etc/{passwd,group} files but this is all based on nil interface checks,
which were broken by Docker's usage of the API.
When combined with some recent changes in runc that made read errors
actually be returned to the caller, this results in spurrious -EINVAL
errors when we should detect the situation as "there is no passwd file".
- Description for the changelog