Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

selinux: don't use lsetxattr on /proc/self/fd/%d and bump selinux to v1.10.1 #3889

Closed
wants to merge 2 commits into from
Closed

selinux: don't use lsetxattr on /proc/self/fd/%d and bump selinux to v1.10.1 #3889

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
f682ad8
selinux: don't use lsetxattr on /proc/self/fd/%d
flouthoc Apr 1, 2022
552a4c6
vendor: bump selinux to v1.10.1
flouthoc Apr 1, 2022
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion go.mod
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@ require (
github.com/opencontainers/runc v1.1.1
github.com/opencontainers/runtime-spec v1.0.3-0.20210326190908-1c3f411f0417
github.com/opencontainers/runtime-tools v0.9.0
github.com/opencontainers/selinux v1.10.0
github.com/opencontainers/selinux v1.10.1
github.com/openshift/imagebuilder v1.2.3
github.com/pkg/errors v0.9.1
github.com/prometheus/client_golang v1.11.1 // indirect
Expand Down
3 changes: 2 additions & 1 deletion go.sum
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -877,8 +877,9 @@ github.com/opencontainers/selinux v1.6.0/go.mod h1:VVGKuOLlE7v4PJyT6h7mNWvq1rzqi
github.com/opencontainers/selinux v1.8.0/go.mod h1:RScLhm78qiWa2gbVCcGkC7tCGdgk3ogry1nUQF8Evvo=
github.com/opencontainers/selinux v1.8.2/go.mod h1:MUIHuUEvKB1wtJjQdOyYRgOnLD2xAPP8dBsCoU0KuF8=
github.com/opencontainers/selinux v1.8.5/go.mod h1:HTvjPFoGMbpQsG886e3lQwnsRWtE4TC1OF3OUvG9FAo=
github.com/opencontainers/selinux v1.10.0 h1:rAiKF8hTcgLI3w0DHm6i0ylVVcOrlgR1kK99DRLDhyU=
github.com/opencontainers/selinux v1.10.0/go.mod h1:2i0OySw99QjzBBQByd1Gr9gSjvuho1lHsJxIJ3gGbJI=
github.com/opencontainers/selinux v1.10.1 h1:09LIPVRP3uuZGQvgR+SgMSNBd1Eb3vlRbGqQpoHsF8w=
github.com/opencontainers/selinux v1.10.1/go.mod h1:2i0OySw99QjzBBQByd1Gr9gSjvuho1lHsJxIJ3gGbJI=
github.com/openshift/imagebuilder v1.2.3 h1:jvA7mESJdclRKkTe3Yl6UWlliFNVW6mLY8RI+Rrfhfo=
github.com/openshift/imagebuilder v1.2.3/go.mod h1:TRYHe4CH9U6nkDjxjBNM5klrLbJBrRbpJE5SaRwUBsQ=
github.com/opentracing/opentracing-go v1.1.0/go.mod h1:UkNAQd3GIcIGf0SeVgPpRdFStlNbqXla1AfSYxPUl2o=
Expand Down
3 changes: 1 addition & 2 deletions selinux.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,6 @@ import (

"github.com/opencontainers/runtime-tools/generate"
selinux "github.com/opencontainers/selinux/go-selinux"
"github.com/opencontainers/selinux/go-selinux/label"
"github.com/pkg/errors"
)

Expand All @@ -33,7 +32,7 @@ func runLabelStdioPipes(stdioPipe [][]int, processLabel, mountLabel string) erro
}
for i := range stdioPipe {
pipeFdName := fmt.Sprintf("/proc/self/fd/%d", stdioPipe[i][0])
if err := label.Relabel(pipeFdName, pipeContext, false); err != nil {
if err := selinux.Chcon(pipeFdName, pipeContext, false); err != nil {
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

label.Relabel ends up calling selinux.Chcon, but it checks if selinux is enabled.

Why do we need this change?

Copy link
Collaborator Author

@flouthoc flouthoc Apr 1, 2022 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

@giuseppe Relabel calls Chcon but ends up hard-coding recurse flag to true https://github.com/opencontainers/selinux/blob/main/go-selinux/label/label_linux.go#L169, which is now configured to use lsetxattr( always instead of setxattr ( the change was done here opencontainers/selinux#173 ) and for somereason lsetxattr always gives operation not supported for both rootless and root cases when labeling /proc/self/fd/%d . I think that's because lsetxattr tries to label this special symlink /proc/self/fd/%d but instead it should try to label the actual file like setxattr( used to do before.

Failure is easy to reproduce if you see containers/podman#13687 and #3875

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

thanks.

What happens now if we try to relabel a real symlink (not the magic /proc/self/fd one)? Do we end up relabelling the file it points to?

Copy link
Collaborator Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

@giuseppe Yes I think now we follow the symlink via https://github.com/opencontainers/selinux/blob/main/go-selinux/selinux_linux.go#L338.

return errors.Wrapf(err, "setting file label on %q", pipeFdName)
}
}
Expand Down
2 changes: 1 addition & 1 deletion vendor/github.com/opencontainers/selinux/go-selinux/rchcon.go
View file
Open in desktop

Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.

2 changes: 1 addition & 1 deletion vendor/github.com/opencontainers/selinux/go-selinux/rchcon_go115.go
View file
Open in desktop

Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.

2 changes: 1 addition & 1 deletion vendor/modules.txt
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -415,7 +415,7 @@ github.com/opencontainers/runtime-tools/generate
github.com/opencontainers/runtime-tools/generate/seccomp
github.com/opencontainers/runtime-tools/specerror
github.com/opencontainers/runtime-tools/validate
# github.com/opencontainers/selinux v1.10.0
# github.com/opencontainers/selinux v1.10.1
github.com/opencontainers/selinux/go-selinux
github.com/opencontainers/selinux/go-selinux/label
github.com/opencontainers/selinux/pkg/pwalk
Expand Down