Re: selftests/capabilities: test FAIL on linux mainline and linux-next and PASS on linux-4.4.70+

[Paul Elder]

On 06/28/2017 12:16 AM, Greg KH wrote:
> On Tue, Jun 27, 2017 at 05:13:59PM +0200, Greg KH wrote:
>> On Tue, Jun 27, 2017 at 02:10:32PM +0530, Naresh Kamboju wrote:
>>> selftest capabilities test failed on linux mainline and linux-next and
>>> PASS on linux-4.4.70+
>>
>> Odd.  Any chance you can use 'git bisect' to track down the offending
>> commit?
>>
>> Does this also fail on x86 or any other platform you have available?
>> Let me go try this on my laptop...
> 
> Ok, Linus's current tree (4.12.0-rc7+) also fails on this.  I'm guessing
> it's failing, it's hard to understand the output.  If only we had TAP
> output for this test :)
I tried to take down this test as the next one to tapify but all the forking
with exec_other_validate_cap("./validate_cap", eff, perm, inh, ambient) was
throwing me and the test counter off.

> [RUN]   +++ Tests with uid == 0 +++
> [NOTE]  Using global UIDs for tests
> [RUN]   Root => ep
> [OK]    Capabilities after execve were correct
> [OK]    Child succeeded
> [OK]    Check cap_ambient manipulation rules
> [OK]    PR_CAP_AMBIENT_RAISE failed on non-inheritable cap
> [OK]    PR_CAP_AMBIENT_RAISE failed on non-permitted cap
> [OK]    PR_CAP_AMBIENT_RAISE worked
> [OK]    Basic manipulation appears to work
> [RUN]   Root +i => eip
> [OK]    Capabilities after execve were correct
> [OK]    Child succeeded
> [RUN]   UID 0 +ia => eipa
> [OK]    Capabilities after execve were correct
> [OK]    Child succeeded
> [RUN]   Root +ia, suidroot => eipa
> [OK]    Capabilities after execve were correct
> [OK]    Child succeeded
> [RUN]   Root +ia, suidnonroot => ip
> [FAIL]  Wrong effective state (AT_SECURE is not set)
> [FAIL]  Child failed
> [RUN]   Root +ia, sgidroot => eipa
> [OK]    Capabilities after execve were correct
> [OK]    Child succeeded
> [RUN]   Root, gid != 0, +ia, sgidroot => eip
> [FAIL]  Wrong ambient state (AT_SECURE is not set)
> [FAIL]  Child failed
> [RUN]   Root +ia, sgidnonroot => eip
> [FAIL]  Wrong ambient state (AT_SECURE is not set)
> [FAIL]  Child failed
> [FAIL]  Child failed
> [RUN]   +++ Tests with uid != 0 +++
> [NOTE]  Using global UIDs for tests
> [RUN]   Non-root => no caps
> [OK]    Capabilities after execve were correct
> [OK]    Child succeeded
> [OK]    Check cap_ambient manipulation rules
> [OK]    PR_CAP_AMBIENT_RAISE failed on non-inheritable cap
> [OK]    PR_CAP_AMBIENT_RAISE failed on non-permitted cap
> [OK]    PR_CAP_AMBIENT_RAISE worked
> [OK]    Basic manipulation appears to work
> [RUN]   Non-root +i => i
> [OK]    Capabilities after execve were correct
> [OK]    Child succeeded
> [RUN]   UID 1 +ia => eipa
> [OK]    Capabilities after execve were correct
> [OK]    Child succeeded
> [RUN]   Non-root +ia, sgidnonroot => i
> [FAIL]  Wrong effective state (AT_SECURE is not set)
> [FAIL]  Child failed
I'm on 4.9.0-3-amd64 (Debian distro kernel) running the test
from linux-kselftest-next and I have the exact same output.

Paul