bpf: Add file_pos field to bpf_sysctl ctx

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Add file_pos field to bpf_sysctl context to read and write sysctl file
position at which sysctl is being accessed (read or written).

The field can be used to e.g. override whole sysctl value on write to
sysctl even when sys_write is called by user space with file_pos > 0. Or
BPF program may reject such accesses.

Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Andrey Ignatov 2019-03-07 18:50:52 -08:00 • committed by Alexei Starovoitov

parent 4e63acdff8

commit e1550bfe0d

5 changed files with 63 additions and 8 deletions

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include/uapi/linux/bpf.h

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