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Revert "Don't check for apparmor_parser to be present"

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This reverts commit 1acca8bba3.

As stated in the Godoc, this function is intended to check for presence
of `apparmor_parser`. Changing this regressed the public API of
containerd, and directly contradicts the way that this function is
consumed inside of containerd itself:
* fdfdc9bfc0/pkg/apparmor/apparmor.go (L20)
* fdfdc9bfc0/pkg/cri/sbserver/helpers_linux.go (L85)
* fdfdc9bfc0/pkg/cri/server/helpers_linux.go (L144)

This has lead to a number of painful regressions and attempted fixes in
Moby:
* https://github.com/moby/moby/issues/44900
* https://github.com/moby/moby/pull/44902
* https://github.com/moby/moby/issues/44970

While reverting this late into the life of 1.6 and at the start of the
life of 1.7 is likely painful, I think this is ultimately the best path
to take, as containerd is subject to the same failure to start
containers with an AppArmor kernel when `apparmor_parser` is missing as
Moby.

Signed-off-by: Bjorn Neergaard <bneergaard@mirantis.com>
This commit is contained in:
Bjorn Neergaard 2023-02-10 10:05:56 -07:00
parent fdfdc9bfc0
commit a3265102d9
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1 changed files with 4 additions and 2 deletions
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6
pkg/apparmor/apparmor_linux.go
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@ -35,8 +35,10 @@ func hostSupports() bool {
checkAppArmor.Do(func() {
// see https://github.com/opencontainers/runc/blob/0d49470392206f40eaab3b2190a57fe7bb3df458/libcontainer/apparmor/apparmor_linux.go
if _, err := os.Stat("/sys/kernel/security/apparmor"); err == nil && os.Getenv("container") == "" {
buf, err := os.ReadFile("/sys/module/apparmor/parameters/enabled")
appArmorSupported = err == nil && len(buf) > 1 && buf[0] == 'Y'
if _, err = os.Stat("/sbin/apparmor_parser"); err == nil {
buf, err := os.ReadFile("/sys/module/apparmor/parameters/enabled")
appArmorSupported = err == nil && len(buf) > 1 && buf[0] == 'Y'
}
}
})
return appArmorSupported