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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 /libpod | |
| 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 'libpod')
| -rw-r--r-- | libpod/oci_conmon_exec_linux.go | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/libpod/oci_conmon_exec_linux.go b/libpod/oci_conmon_exec_linux.go index aa970bbde..65123b37e 100644 --- a/libpod/oci_conmon_exec_linux.go +++ b/libpod/oci_conmon_exec_linux.go @@ -758,11 +758,14 @@ func prepareProcessExec(c *Container, options *ExecOptions, env []string, sessio } else { pspec.Capabilities.Bounding = ctrSpec.Process.Capabilities.Bounding } + + // Always unset the inheritable capabilities similarly to what the Linux kernel does + // They are used only when using capabilities with uid != 0. + pspec.Capabilities.Inheritable = []string{} + if execUser.Uid == 0 { pspec.Capabilities.Effective = pspec.Capabilities.Bounding - pspec.Capabilities.Inheritable = pspec.Capabilities.Bounding pspec.Capabilities.Permitted = pspec.Capabilities.Bounding - pspec.Capabilities.Ambient = pspec.Capabilities.Bounding } else { if user == c.config.User { pspec.Capabilities.Effective = ctrSpec.Process.Capabilities.Effective |