Fix runc run "permission denied" when rootless #3753
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Go 1.20.2 seems released |
Closed
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Reworked to not re-introduced #3520. Description updated. |
kolyshkin
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kolyshkin
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AkihiroSuda,
cyphar,
hqhq,
mrunalp and
thaJeztah
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@opencontainers/runc-maintainers PTAL (this needs to be merged then backported to 1.1, and since it is a regression in 1.1.4 I want to fix it in time for 1.1.5). |
AkihiroSuda
reviewed
Mar 21, 2023
thaJeztah
reviewed
Mar 25, 2023
Go 1.20.2 has an important fix to an issue described in [1]. Switch from using Go 1.19 from Dockerfile, which is used for release binaries and some CI. [1] golang/go#58624 Signed-off-by: Kir Kolyshkin <[email protected]>
Since commit 957d97b was made to fix issue [7], a few things happened: - a similar functionality appeared in go 1.20 [1], so the issue mentioned in the comment (being removed) is no longer true; - a bug in runc was found [2], which also affects go [3]; - the bug was fixed in go 1.21 [4] and 1.20.2 [5]; - a similar fix was made to x/sys/unix.Faccessat [6]. The essense of [2] is, even if a (non-root) user that the container is run as does not have execute permission bit set for the executable, it should still work in case runc has the CAP_DAC_OVERRIDE capability set. To fix this [2] without reintroducing the older bug [7]: - drop own Eaccess implementation; - use the one from x/sys/unix for Go 1.19 (depends on [6]); - do not use anything when Go 1.20+ is used. NOTE it is virtually impossible to fix the bug [2] when Go 1.20 or Go 1.20.1 is used because of [3]. A test case is added by a separate commit. Fixes: opencontainers#3715. [1] https://go-review.googlesource.com/c/go/+/414824 [2] opencontainers#3715 [3] https://go.dev/issue/58552 [4] https://go-review.googlesource.com/c/go/+/468735 [5] https://go-review.googlesource.com/c/go/+/469956 [6] https://go-review.googlesource.com/c/sys/+/468877 [7] opencontainers#3520 Signed-off-by: Kir Kolyshkin <[email protected]>
This is a test case for issue reported as opencontainers#3715. In short, even if a (non-root) user that the container is run as does not have execute permission bit set for the executable, it should still work in case runc has the CAP_DAC_OVERRIDE capability set. Note that since the upstream golang is also broken (see [1]), this test will fail for Go 1.20 and 1.20.1 (fix is in Go 1.20.2 as per [2]). [1] https://go.dev/issue/58552 [2] https://go-review.googlesource.com/c/go/+/469956 Signed-off-by: Kir Kolyshkin <[email protected]>
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@AkihiroSuda @thaJeztah addressed your review comments, PTAAL. |
AkihiroSuda
approved these changes
Mar 28, 2023
mrunalp
approved these changes
Mar 28, 2023
This was referenced Apr 4, 2023
Merged
kolyshkin
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backport/1.1-done
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1.1 backport: #3817 |
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Fixes: #3715
Since PR #3522 (commit 957d97b) was made to fix issue #3520,
a few things happened:
mentioned in the comment (being removed) is no longer true;
The essense of the bug #3715 is, even if a (non-root) user that the container is
run as does not have execute permission bit set for the executable, it
should still work in case runc has the CAP_DAC_OVERRIDE capability set.
To fix #3715 without reintroducing the older bug [7]:
Add a test case to make sure we won't regress.
NOTE it is virtually impossible to fix the bug [2] when Go 1.20 or Go
1.20.1 is used because of [3].
[1] https://go-review.googlesource.com/c/go/+/414824
[2] #3715
[3] https://go.dev/issue/58552
[4] https://go-review.googlesource.com/c/go/+/468735
[5] https://go-review.googlesource.com/c/go/+/469956
[6] https://go-review.googlesource.com/c/sys/+/468877
[7] #3520