bpf: Add new bpf_task_storage_delete proto with no deadlock detection

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The bpf_lsm and bpf_iter do not recur that will cause a deadlock.
The situation is similar to the bpf_pid_task_storage_delete_elem()
which is called from the syscall map_delete_elem.  It does not need
deadlock detection.  Otherwise, it will cause unnecessary failure
when calling the bpf_task_storage_delete() helper.

This patch adds bpf_task_storage_delete proto that does not do deadlock
detection.  It will be used by bpf_lsm and bpf_iter program.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20221025184524.3526117-8-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Martin KaFai Lau 2022-10-25 11:45:22 -07:00 • committed by Alexei Starovoitov

parent fda64ae0bb

commit 8a7dac37f2

3 changed files with 32 additions and 1 deletions

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1

include/linux/bpf.h

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28

kernel/bpf/bpf_task_storage.c

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4

kernel/trace/bpf_trace.c

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