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SubjectLinux 5.0-rc2 seccomp_bpf user_notification_basic test hangs
Date
Hi Kees and James,

seccomp_bpf test hangs right after the following test passes
with EBUSY. Please see log at the end.

/* Installing a second listener in the chain should EBUSY */
EXPECT_EQ(user_trap_syscall(__NR_getpid,
SECCOMP_FILTER_FLAG_NEW_LISTENER),
-1);
EXPECT_EQ(errno, EBUSY);


The user_notification_basic test starts running I assume and then
the hang.

The only commit I see that could be suspect is the following as
it talks about adding SECCOMP_RET_USER_NOTIF

commit d9a7fa67b4bfe6ce93ee9aab23ae2e7ca0763e84
Merge: f218a29c25ad 55b8cbe470d1
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed Jan 2 09:48:13 2019 -0800

Merge branch 'next-seccomp' of
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull seccomp updates from James Morris:

- Add SECCOMP_RET_USER_NOTIF

- seccomp fixes for sparse warnings and s390 build (Tycho)

* 'next-seccomp' of
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
seccomp, s390: fix build for syscall type change
seccomp: fix poor type promotion
samples: add an example of seccomp user trap
seccomp: add a return code to trap to userspace
seccomp: switch system call argument type to void *
seccomp: hoist struct seccomp_data recalculation higher


Any ideas on how to proceed? Here is the log. The following
reproduces the problem.

make -C tools/testing/selftests/seccomp/ run_tests


seccomp_bpf.c:2947:global.get_metadata:Expected 0 (0) ==
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG, &prog)
(18446744073709551615)
seccomp_bpf.c:2959:global.get_metadata:Expected 1 (1) == read(pipefd[0],
&buf, 1) (0)
global.get_metadata: Test terminated by assertion
[ FAIL ] global.get_metadata
[ RUN ] global.user_notification_basic
seccomp_bpf.c:3036:global.user_notification_basic:Expected 0 (0) ==
WEXITSTATUS(status) (1)
seccomp_bpf.c:3039:global.user_notification_basic:Expected
seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog) (18446744073709551615) == 0 (0)
seccomp_bpf.c:3040:global.user_notification_basic:Expected
seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog) (18446744073709551615) == 0 (0)
seccomp_bpf.c:3041:global.user_notification_basic:Expected
seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog) (18446744073709551615) == 0 (0)
seccomp_bpf.c:3042:global.user_notification_basic:Expected
seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog) (18446744073709551615) == 0 (0)
seccomp_bpf.c:3047:global.user_notification_basic:Expected listener
(18446744073709551615) >= 0 (0)
seccomp_bpf.c:3053:global.user_notification_basic:Expected errno (13) ==
EBUSY (16)

thanks,
-- Shuah

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