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Add container GID to additional groups

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Mitigates a potential permissions issue. Mirrors Buildah PR #4200
and CRI-O PR #6159.

Signed-off-by: Matthew Heon <mheon@redhat.com>
(cherry picked from commit d82a41687e)
This commit is contained in:
Matthew Heon 2022-09-02 13:40:29 -04:00 • committed by Dan Čermák
parent f122c54a6a
commit accda2482e
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GPG key ID: 8F8C178E966641D3
3 changed files with 13 additions and 3 deletions
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1
libpod/container_internal_linux.go
View file

@ -500,6 +500,7 @@ func (c *Container) generateSpec(ctx context.Context) (*spec.Spec, error) {
// User and Group must go together
g.SetProcessUID(uint32(execUser.Uid))
g.SetProcessGID(uint32(execUser.Gid))
g.AddProcessAdditionalGid(uint32(execUser.Gid))
}
if c.config.Umask != "" {

1
pkg/specgen/namespaces.go
View file

@ -363,6 +363,7 @@ func SetupUserNS(idmappings *storage.IDMappingOptions, userns Namespace, g *gene
idmappings = mappings
g.SetProcessUID(uint32(uid))
g.SetProcessGID(uint32(gid))
g.AddProcessAdditionalGid(uint32(gid))
user = fmt.Sprintf("%d:%d", uid, gid)
fallthrough
case Private:

14
test/e2e/run_test.go
View file

@ -848,7 +848,7 @@ USER bin`, BB)
session := podmanTest.Podman([]string{"run", "--rm", "--user=1234", ALPINE, "id"})
session.WaitWithDefaultTimeout()
Expect(session).Should(Exit(0))
Expect(session.OutputToString()).To(Equal("uid=1234(1234) gid=0(root)"))
Expect(session.OutputToString()).To(Equal("uid=1234(1234) gid=0(root) groups=0(root)"))
})
It("podman run with user (integer, in /etc/passwd)", func() {
@ -869,14 +869,14 @@ USER bin`, BB)
session := podmanTest.Podman([]string{"run", "--rm", "--user=mail:21", ALPINE, "id"})
session.WaitWithDefaultTimeout()
Expect(session).Should(Exit(0))
Expect(session.OutputToString()).To(Equal("uid=8(mail) gid=21(ftp)"))
Expect(session.OutputToString()).To(Equal("uid=8(mail) gid=21(ftp) groups=21(ftp)"))
})
It("podman run with user:group (integer:groupname)", func() {
session := podmanTest.Podman([]string{"run", "--rm", "--user=8:ftp", ALPINE, "id"})
session.WaitWithDefaultTimeout()
Expect(session).Should(Exit(0))
Expect(session.OutputToString()).To(Equal("uid=8(mail) gid=21(ftp)"))
Expect(session.OutputToString()).To(Equal("uid=8(mail) gid=21(ftp) groups=21(ftp)"))
})
It("podman run with user, verify caps dropped", func() {
@ -887,6 +887,14 @@ USER bin`, BB)
Expect("0000000000000000").To(Equal(capEff[1]))
})
It("podman run with user, verify group added", func() {
session := podmanTest.Podman([]string{"run", "--rm", "--user=1000:1000", ALPINE, "grep", "Groups:", "/proc/self/status"})
session.WaitWithDefaultTimeout()
Expect(session).Should(Exit(0))
groups := strings.Split(session.OutputToString(), " ")[1]
Expect("1000").To(Equal(groups))
})
It("podman run with attach stdin outputs container ID", func() {
session := podmanTest.Podman([]string{"run", "--attach", "stdin", ALPINE, "printenv"})
session.WaitWithDefaultTimeout()