bpf: Extend BPF syscall with common attributes support

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Add generic BPF syscall support for passing common attributes.

The initial set of common attributes includes:

1. 'log_buf': User-provided buffer for storing logs.
2. 'log_size': Size of the log buffer.
3. 'log_level': Log verbosity level.
4. 'log_true_size': Actual log size reported by kernel.

The common-attribute pointer and its size are passed as the 4th and 5th
syscall arguments. A new command bit, 'BPF_COMMON_ATTRS' ('1 << 16'),
indicates that common attributes are supplied.

This commit adds syscall and uapi plumbing. Command-specific handling is
added in follow-up patches.

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20260512153157.28382-2-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Leon Hwang 2026-05-12 23:31:50 +08:00 • committed by Alexei Starovoitov

parent 25bb05dd06

commit f28771c069

4 changed files with 39 additions and 5 deletions

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3

include/linux/syscalls.h

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8

include/uapi/linux/bpf.h

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25

kernel/bpf/syscall.c

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8

tools/include/uapi/linux/bpf.h

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