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From: Yonghong Song <yhs@fb.com>
To: <bpf@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>, <kernel-team@fb.com>
Subject: [PATCH bpf-next v3 0/2] bpf: permits pointers on stack for helper calls
Date: Thu, 10 Dec 2020 19:41:21 -0800	[thread overview]
Message-ID: <20201211034121.3452172-1-yhs@fb.com> (raw)

This patch permits pointers on stack for helper calls if permission is
granted. Patch #1 described the detailed usecase and Patch #2
added a test.

Changelog:
  v2 -> v3:
    - do not permit spilled reg state NOT_INIT on stack. (Daniel)
  v1 -> v2:
    - fix a verifier test failure due to verifier change.

Yonghong Song (2):
  bpf: permits pointers on stack for helper calls
  selftests/bpf: add a test for ptr_to_map_value on stack for helper
    access

 kernel/bpf/verifier.c                             | 4 +++-
 tools/testing/selftests/bpf/progs/bpf_iter_task.c | 3 ++-
 tools/testing/selftests/bpf/verifier/unpriv.c     | 5 +++--
 3 files changed, 8 insertions(+), 4 deletions(-)

-- 
2.24.1


             reply	other threads:[~2020-12-11  3:43 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-11  3:41 Yonghong Song [this message]
2020-12-11  3:41 ` [PATCH bpf-next v3 1/2] bpf: permits pointers on stack for helper calls Yonghong Song
2020-12-14 21:26   ` Daniel Borkmann
2020-12-15  3:57     ` Yonghong Song
2020-12-11  3:41 ` [PATCH bpf-next v3 2/2] selftests/bpf: add a test for ptr_to_map_value on stack for helper access Yonghong Song

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