diff options
| author | Andrey Ignatov <rdna@fb.com> | 2019-03-07 18:50:52 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2019-04-12 13:54:58 -0700 |
| commit | e1550bfe0de47e30484ba91de1e50a91ec1c31f5 (patch) | |
| tree | 417b3aa59134dff973b0b59f0cfdc1460284aed9 /include/uapi/linux/bpf.h | |
| parent | 4e63acdff864654cee0ac5aaeda3913798ee78f6 (diff) | |
bpf: Add file_pos field to bpf_sysctl ctx
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>
Diffstat (limited to 'include/uapi/linux/bpf.h')
| -rw-r--r-- | include/uapi/linux/bpf.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 547b8258d731..89976de909af 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -3391,6 +3391,9 @@ struct bpf_sysctl { __u32 write; /* Sysctl is being read (= 0) or written (= 1). * Allows 1,2,4-byte read, but no write. */ + __u32 file_pos; /* Sysctl file position to read from, write to. + * Allows 1,2,4-byte read an 4-byte write. + */ }; #endif /* _UAPI__LINUX_BPF_H__ */ |