fix can't use empty str as label in some old kernels by lifubang · Pull Request #50 · opencontainers/selinux

lifubang · 2019-04-04T08:28:00Z

Signed-off-by: lifubang lifubang@acmcoder.com

In some old kernels, for example, 3.10.0-862.el7.x86_64 in RedHat Enterprise Linux 7.5.
Docker in this kernel works very well.
While the docker version is:
docker-ce=3:18.09.4-3.el7 with containerd=1.2.5-3.1.el7.

But runc in master version works fail:
If we use empty string as a label, it will fail:
write /proc/self/attr/keycreate: permission denied
It will cause runc fail.

If the label is not empty, it will success.

lifubang · 2019-04-04T08:28:50Z

I think 3.10.0 kernel is still used by lots of users, especially in some cloud.

Signed-off-by: lifubang <lifubang@acmcoder.com>

lifubang · 2019-04-04T10:55:27Z

go-selinux/label/label_selinux.go

 // label to the next program executed by the current process.
 func SetProcessLabel(processLabel string) error {
+	if processLabel == "" && selinux.GetEnabled() {
+		processLabel = "unconfined_u:unconfined_r:unconfined_t:s0"


@rhatdan Does it make sense?

Or after failure with "", then we try "unconfined_u:unconfined_r:unconfined_t:s0" next?

No we should not hard code this label. "" is a valid label.

It tells the the library to reset the kernel to use default labeling.

rhatdan · 2019-04-04T13:41:54Z

go-selinux/label/label_selinux.go


+// ClearProcessLabel is to clear process's label
+func ClearProcessLabel() error {
+	return selinux.SetExecLabel("unconfined_u:unconfined_r:unconfined_t:s0")


No we don't hard code any labels in the library. ClearProcessLabel sets the label to "", which tells the kernel to use default labeling.

rhatdan · 2019-04-04T13:42:05Z

go-selinux/label/label_selinux.go

 // label to the next kernel keyring that gets created
 func SetKeyLabel(processLabel string) error {
+	if processLabel == "" && selinux.GetEnabled() {
+		processLabel = "unconfined_u:unconfined_r:unconfined_t:s0"


Wrong see above.

rhatdan · 2019-04-04T13:42:15Z

go-selinux/label/label_selinux.go


+// ClearKeyLabel is to clear key label
+func ClearKeyLabel() error {
+	return selinux.SetKeyLabel("unconfined_u:unconfined_r:unconfined_t:s0")


rhatdan · 2019-04-04T13:43:41Z

The way to fix this is to do a check if /proc/self/attr/keycreate does not exist, If it does not then fail silently.
Not great, but I don't want to hard code checking of kernel versions.

lifubang · 2019-04-04T13:47:41Z

The way to fix this is to do a check if /proc/self/attr/keycreate does not exist, If it does not then fail silently.
Not great, but I don't want to hard code checking of kernel versions.

OK, thanks. I will submit later.

rhatdan · 2019-04-04T13:53:27Z

Replaced by #51

lifubang · 2019-04-04T14:06:18Z

@rhatdan I think #51 can't fix this issue, please reopen this PR, I will change the code to tell you why. Thanks. Or I open a new one?

From the release notes: https://github.com/containerd/containerd/releases/tag/v1.2.7 > Welcome to the v1.2.7 release of containerd! > > The seventh patch release for containerd 1.2 introduces OCI image > descriptor annotation support and contains fixes for containerd shim logs, > container stop/deletion, cri plugin and selinux. > > It also contains several important bug fixes for goroutine and file > descriptor leakage in containerd and containerd shims. > > Notable Updates > > - Support annotations in the OCI image descriptor, and filtering image by annotations. containerd/containerd#3254 > - Support context timeout in ttrpc which can help avoid containerd hangs when a shim is unresponsive. containerd/ttrpc#31 > - Fix a bug that containerd shim leaks goroutine and file descriptor after containerd restarts. containerd/ttrpc#37 > - Fix a bug that a container can't be deleted if first deletion attempt is canceled or timeout. containerd/containerd#3264 > - Fix a bug that containerd leaks file descriptor when using v2 containerd shims, e.g. containerd-shim-runc-v1. containerd/containerd#3273 > - Fix a bug that a container with lingering processes can't terminate when it shares pid namespace with another container. moby#38978 > - Fix a bug that containerd can't read shim logs after restart. containerd/containerd#3282 > - Fix a bug that shim_debug option is not honored for existing containerd shims after containerd restarts. containerd/containerd#3283 > - cri: Fix a bug that a container can't be stopped when the exit event is not successfully published by the containerd shim. containerd/containerd#3125, containerd/containerd#3177 > - cri: Fix a bug that exec process is not cleaned up if grpc context is canceled or timeout. contaienrd/cri#1159 > - Fix a selinux keyring labeling issue by updating runc to v1.0.0-rc.8 and selinux library to v1.2.2. opencontainers/selinux#50 > - Update ttrpc to f82148331ad2181edea8f3f649a1f7add6c3f9c2. containerd/containerd#3316 > - Update cri to 49ca74043390bc2eeea7a45a46005fbec58a3f88. containerd/containerd#3330 Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

From the release notes: https://github.com/containerd/containerd/releases/tag/v1.2.7 > Welcome to the v1.2.7 release of containerd! > > The seventh patch release for containerd 1.2 introduces OCI image > descriptor annotation support and contains fixes for containerd shim logs, > container stop/deletion, cri plugin and selinux. > > It also contains several important bug fixes for goroutine and file > descriptor leakage in containerd and containerd shims. > > Notable Updates > > - Support annotations in the OCI image descriptor, and filtering image by annotations. containerd/containerd#3254 > - Support context timeout in ttrpc which can help avoid containerd hangs when a shim is unresponsive. containerd/ttrpc#31 > - Fix a bug that containerd shim leaks goroutine and file descriptor after containerd restarts. containerd/ttrpc#37 > - Fix a bug that a container can't be deleted if first deletion attempt is canceled or timeout. containerd/containerd#3264 > - Fix a bug that containerd leaks file descriptor when using v2 containerd shims, e.g. containerd-shim-runc-v1. containerd/containerd#3273 > - Fix a bug that a container with lingering processes can't terminate when it shares pid namespace with another container. moby/moby#38978 > - Fix a bug that containerd can't read shim logs after restart. containerd/containerd#3282 > - Fix a bug that shim_debug option is not honored for existing containerd shims after containerd restarts. containerd/containerd#3283 > - cri: Fix a bug that a container can't be stopped when the exit event is not successfully published by the containerd shim. containerd/containerd#3125, containerd/containerd#3177 > - cri: Fix a bug that exec process is not cleaned up if grpc context is canceled or timeout. contaienrd/cri#1159 > - Fix a selinux keyring labeling issue by updating runc to v1.0.0-rc.8 and selinux library to v1.2.2. opencontainers/selinux#50 > - Update ttrpc to f82148331ad2181edea8f3f649a1f7add6c3f9c2. containerd/containerd#3316 > - Update cri to 49ca74043390bc2eeea7a45a46005fbec58a3f88. containerd/containerd#3330 Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Upstream-commit: d5669ec1c6eedcd5dd8b0ecd615638934561daa4 Component: engine

From the release notes: https://github.com/containerd/containerd/releases/tag/v1.2.7 > Welcome to the v1.2.7 release of containerd! > > The seventh patch release for containerd 1.2 introduces OCI image > descriptor annotation support and contains fixes for containerd shim logs, > container stop/deletion, cri plugin and selinux. > > It also contains several important bug fixes for goroutine and file > descriptor leakage in containerd and containerd shims. > > Notable Updates > > - Support annotations in the OCI image descriptor, and filtering image by annotations. containerd/containerd#3254 > - Support context timeout in ttrpc which can help avoid containerd hangs when a shim is unresponsive. containerd/ttrpc#31 > - Fix a bug that containerd shim leaks goroutine and file descriptor after containerd restarts. containerd/ttrpc#37 > - Fix a bug that a container can't be deleted if first deletion attempt is canceled or timeout. containerd/containerd#3264 > - Fix a bug that containerd leaks file descriptor when using v2 containerd shims, e.g. containerd-shim-runc-v1. containerd/containerd#3273 > - Fix a bug that a container with lingering processes can't terminate when it shares pid namespace with another container. moby#38978 > - Fix a bug that containerd can't read shim logs after restart. containerd/containerd#3282 > - Fix a bug that shim_debug option is not honored for existing containerd shims after containerd restarts. containerd/containerd#3283 > - cri: Fix a bug that a container can't be stopped when the exit event is not successfully published by the containerd shim. containerd/containerd#3125, containerd/containerd#3177 > - cri: Fix a bug that exec process is not cleaned up if grpc context is canceled or timeout. contaienrd/cri#1159 > - Fix a selinux keyring labeling issue by updating runc to v1.0.0-rc.8 and selinux library to v1.2.2. opencontainers/selinux#50 > - Update ttrpc to f82148331ad2181edea8f3f649a1f7add6c3f9c2. containerd/containerd#3316 > - Update cri to 49ca74043390bc2eeea7a45a46005fbec58a3f88. containerd/containerd#3330 Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commit d5669ec) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

From the release notes: https://github.com/containerd/containerd/releases/tag/v1.2.7 > Welcome to the v1.2.7 release of containerd! > > The seventh patch release for containerd 1.2 introduces OCI image > descriptor annotation support and contains fixes for containerd shim logs, > container stop/deletion, cri plugin and selinux. > > It also contains several important bug fixes for goroutine and file > descriptor leakage in containerd and containerd shims. > > Notable Updates > > - Support annotations in the OCI image descriptor, and filtering image by annotations. containerd/containerd#3254 > - Support context timeout in ttrpc which can help avoid containerd hangs when a shim is unresponsive. containerd/ttrpc#31 > - Fix a bug that containerd shim leaks goroutine and file descriptor after containerd restarts. containerd/ttrpc#37 > - Fix a bug that a container can't be deleted if first deletion attempt is canceled or timeout. containerd/containerd#3264 > - Fix a bug that containerd leaks file descriptor when using v2 containerd shims, e.g. containerd-shim-runc-v1. containerd/containerd#3273 > - Fix a bug that a container with lingering processes can't terminate when it shares pid namespace with another container. moby/moby#38978 > - Fix a bug that containerd can't read shim logs after restart. containerd/containerd#3282 > - Fix a bug that shim_debug option is not honored for existing containerd shims after containerd restarts. containerd/containerd#3283 > - cri: Fix a bug that a container can't be stopped when the exit event is not successfully published by the containerd shim. containerd/containerd#3125, containerd/containerd#3177 > - cri: Fix a bug that exec process is not cleaned up if grpc context is canceled or timeout. contaienrd/cri#1159 > - Fix a selinux keyring labeling issue by updating runc to v1.0.0-rc.8 and selinux library to v1.2.2. opencontainers/selinux#50 > - Update ttrpc to f82148331ad2181edea8f3f649a1f7add6c3f9c2. containerd/containerd#3316 > - Update cri to 49ca74043390bc2eeea7a45a46005fbec58a3f88. containerd/containerd#3330 Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commit d5669ec1c6eedcd5dd8b0ecd615638934561daa4) Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Upstream-commit: 768923199f89246ff51039ae030e4b492f8d4555 Component: engine

From the release notes: https://github.com/containerd/containerd/releases/tag/v1.2.7 > Welcome to the v1.2.7 release of containerd! > > The seventh patch release for containerd 1.2 introduces OCI image > descriptor annotation support and contains fixes for containerd shim logs, > container stop/deletion, cri plugin and selinux. > > It also contains several important bug fixes for goroutine and file > descriptor leakage in containerd and containerd shims. > > Notable Updates > > - Support annotations in the OCI image descriptor, and filtering image by annotations. containerd/containerd#3254 > - Support context timeout in ttrpc which can help avoid containerd hangs when a shim is unresponsive. containerd/ttrpc#31 > - Fix a bug that containerd shim leaks goroutine and file descriptor after containerd restarts. containerd/ttrpc#37 > - Fix a bug that a container can't be deleted if first deletion attempt is canceled or timeout. containerd/containerd#3264 > - Fix a bug that containerd leaks file descriptor when using v2 containerd shims, e.g. containerd-shim-runc-v1. containerd/containerd#3273 > - Fix a bug that a container with lingering processes can't terminate when it shares pid namespace with another container. moby#38978 > - Fix a bug that containerd can't read shim logs after restart. containerd/containerd#3282 > - Fix a bug that shim_debug option is not honored for existing containerd shims after containerd restarts. containerd/containerd#3283 > - cri: Fix a bug that a container can't be stopped when the exit event is not successfully published by the containerd shim. containerd/containerd#3125, containerd/containerd#3177 > - cri: Fix a bug that exec process is not cleaned up if grpc context is canceled or timeout. contaienrd/cri#1159 > - Fix a selinux keyring labeling issue by updating runc to v1.0.0-rc.8 and selinux library to v1.2.2. opencontainers/selinux#50 > - Update ttrpc to f82148331ad2181edea8f3f649a1f7add6c3f9c2. containerd/containerd#3316 > - Update cri to 49ca74043390bc2eeea7a45a46005fbec58a3f88. containerd/containerd#3330 Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commit d5669ec) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

From the release notes: https://github.com/containerd/containerd/releases/tag/v1.2.7 > Welcome to the v1.2.7 release of containerd! > > The seventh patch release for containerd 1.2 introduces OCI image > descriptor annotation support and contains fixes for containerd shim logs, > container stop/deletion, cri plugin and selinux. > > It also contains several important bug fixes for goroutine and file > descriptor leakage in containerd and containerd shims. > > Notable Updates > > - Support annotations in the OCI image descriptor, and filtering image by annotations. containerd/containerd#3254 > - Support context timeout in ttrpc which can help avoid containerd hangs when a shim is unresponsive. containerd/ttrpc#31 > - Fix a bug that containerd shim leaks goroutine and file descriptor after containerd restarts. containerd/ttrpc#37 > - Fix a bug that a container can't be deleted if first deletion attempt is canceled or timeout. containerd/containerd#3264 > - Fix a bug that containerd leaks file descriptor when using v2 containerd shims, e.g. containerd-shim-runc-v1. containerd/containerd#3273 > - Fix a bug that a container with lingering processes can't terminate when it shares pid namespace with another container. moby/moby#38978 > - Fix a bug that containerd can't read shim logs after restart. containerd/containerd#3282 > - Fix a bug that shim_debug option is not honored for existing containerd shims after containerd restarts. containerd/containerd#3283 > - cri: Fix a bug that a container can't be stopped when the exit event is not successfully published by the containerd shim. containerd/containerd#3125, containerd/containerd#3177 > - cri: Fix a bug that exec process is not cleaned up if grpc context is canceled or timeout. contaienrd/cri#1159 > - Fix a selinux keyring labeling issue by updating runc to v1.0.0-rc.8 and selinux library to v1.2.2. opencontainers/selinux#50 > - Update ttrpc to f82148331ad2181edea8f3f649a1f7add6c3f9c2. containerd/containerd#3316 > - Update cri to 49ca74043390bc2eeea7a45a46005fbec58a3f88. containerd/containerd#3330 Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commit d5669ec1c6eedcd5dd8b0ecd615638934561daa4) Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Upstream-commit: 8c7928adaa83264947b6e296eeb068b99843822e Component: engine

From the release notes: https://github.com/containerd/containerd/releases/tag/v1.2.7 > Welcome to the v1.2.7 release of containerd! > > The seventh patch release for containerd 1.2 introduces OCI image > descriptor annotation support and contains fixes for containerd shim logs, > container stop/deletion, cri plugin and selinux. > > It also contains several important bug fixes for goroutine and file > descriptor leakage in containerd and containerd shims. > > Notable Updates > > - Support annotations in the OCI image descriptor, and filtering image by annotations. containerd/containerd#3254 > - Support context timeout in ttrpc which can help avoid containerd hangs when a shim is unresponsive. containerd/ttrpc#31 > - Fix a bug that containerd shim leaks goroutine and file descriptor after containerd restarts. containerd/ttrpc#37 > - Fix a bug that a container can't be deleted if first deletion attempt is canceled or timeout. containerd/containerd#3264 > - Fix a bug that containerd leaks file descriptor when using v2 containerd shims, e.g. containerd-shim-runc-v1. containerd/containerd#3273 > - Fix a bug that a container with lingering processes can't terminate when it shares pid namespace with another container. moby#38978 > - Fix a bug that containerd can't read shim logs after restart. containerd/containerd#3282 > - Fix a bug that shim_debug option is not honored for existing containerd shims after containerd restarts. containerd/containerd#3283 > - cri: Fix a bug that a container can't be stopped when the exit event is not successfully published by the containerd shim. containerd/containerd#3125, containerd/containerd#3177 > - cri: Fix a bug that exec process is not cleaned up if grpc context is canceled or timeout. contaienrd/cri#1159 > - Fix a selinux keyring labeling issue by updating runc to v1.0.0-rc.8 and selinux library to v1.2.2. opencontainers/selinux#50 > - Update ttrpc to f82148331ad2181edea8f3f649a1f7add6c3f9c2. containerd/containerd#3316 > - Update cri to 49ca74043390bc2eeea7a45a46005fbec58a3f88. containerd/containerd#3330 Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Signed-off-by: zach <Zachary.Joyner@linux.com>

lifubang mentioned this pull request Apr 4, 2019

fix failure when selinux enabled in old kernel opencontainers/runc#2033

Closed

lifubang force-pushed the emptylabel branch from 754f899 to 0e02ccc Compare April 4, 2019 08:40

fix can't use empty str as label in some old kernels

2437c7a

Signed-off-by: lifubang <lifubang@acmcoder.com>

lifubang force-pushed the emptylabel branch from 0e02ccc to 2437c7a Compare April 4, 2019 09:19

lifubang commented Apr 4, 2019

View reviewed changes

rhatdan reviewed Apr 4, 2019

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rhatdan closed this Apr 4, 2019

thaJeztah mentioned this pull request Jun 14, 2019

Update containerd to v1.2.7 moby/moby#39364

Merged

This was referenced Jun 14, 2019

[19.03 backport] Update containerd to v1.2.8 docker-archive/engine#282

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[18.09 backport] Update containerd to v1.2.8 docker-archive/engine#283

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thaJeztah mentioned this pull request Sep 6, 2019

[19.03 backport] Update containerd to v1.2.9 docker-archive/engine#349

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fix can't use empty str as label in some old kernels#50

fix can't use empty str as label in some old kernels#50
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