[1.1] Fix runc run "permission denied" when rootless #3817
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AkihiroSuda
approved these changes
Apr 7, 2023
mrunalp
approved these changes
Apr 7, 2023
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 <kolyshkin@gmail.com> (cherry picked from commit 8491d33) Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
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 <kolyshkin@gmail.com> (cherry picked from commit 8293ef2) Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This was referenced Apr 7, 2023
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This is a backport of #3753 to release-1.1 branch. Original description follows.
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