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| author | Giuseppe Scrivano <gscrivan@redhat.com> | 2022-02-28 09:48:52 +0100 |
|---|---|---|
| committer | Giuseppe Scrivano <gscrivan@redhat.com> | 2022-03-23 09:05:18 +0100 |
| commit | aafa80918a245edcbdaceb1191d749570f1872d0 (patch) | |
| tree | bbd84ae1ea3eef9e6f9ffd4684956f4b0f8a0010 /pkg/specgen | |
| parent | c39dffe83db9fa3cfa6897b971956821f1bbcce2 (diff) | |
| download | podman-aafa80918a245edcbdaceb1191d749570f1872d0.tar.gz podman-aafa80918a245edcbdaceb1191d749570f1872d0.tar.bz2 podman-aafa80918a245edcbdaceb1191d749570f1872d0.zip | |
do not set the inheritable capabilities
The kernel never sets the inheritable capabilities for a process, they
are only set by userspace. Emulate the same behavior.
Closes: CVE-2022-27649
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Diffstat (limited to 'pkg/specgen')
| -rw-r--r-- | pkg/specgen/generate/security.go | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/pkg/specgen/generate/security.go b/pkg/specgen/generate/security.go index 9c6709905..988c29832 100644 --- a/pkg/specgen/generate/security.go +++ b/pkg/specgen/generate/security.go @@ -146,6 +146,10 @@ func securityConfigureGenerator(s *specgen.SpecGenerator, g *generate.Generator, configSpec := g.Config configSpec.Process.Capabilities.Ambient = []string{} + + // Always unset the inheritable capabilities similarly to what the Linux kernel does + // They are used only when using capabilities with uid != 0. + configSpec.Process.Capabilities.Inheritable = []string{} configSpec.Process.Capabilities.Bounding = caplist user := strings.Split(s.User, ":")[0] @@ -153,7 +157,6 @@ func securityConfigureGenerator(s *specgen.SpecGenerator, g *generate.Generator, if (user == "" && s.UserNS.NSMode != specgen.KeepID) || user == "root" || user == "0" { configSpec.Process.Capabilities.Effective = caplist configSpec.Process.Capabilities.Permitted = caplist - configSpec.Process.Capabilities.Inheritable = caplist } else { mergedCaps, err := capabilities.MergeCapabilities(nil, s.CapAdd, nil) if err != nil { @@ -175,12 +178,12 @@ func securityConfigureGenerator(s *specgen.SpecGenerator, g *generate.Generator, } configSpec.Process.Capabilities.Effective = userCaps configSpec.Process.Capabilities.Permitted = userCaps - configSpec.Process.Capabilities.Inheritable = userCaps // Ambient capabilities were added to Linux 4.3. Set ambient // capabilities only when the kernel supports them. if supportAmbientCapabilities() { configSpec.Process.Capabilities.Ambient = userCaps + configSpec.Process.Capabilities.Inheritable = userCaps } } |