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 /fs | |
| parent | 4e63acdff864654cee0ac5aaeda3913798ee78f6 (diff) | |
| download | linux-e1550bfe0de47e30484ba91de1e50a91ec1c31f5.tar.bz2 | |
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 'fs')
| -rw-r--r-- | fs/proc/proc_sysctl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c index 023101c6f0d7..2d61e5e8c863 100644 --- a/fs/proc/proc_sysctl.c +++ b/fs/proc/proc_sysctl.c @@ -590,7 +590,7 @@ static ssize_t proc_sys_call_handler(struct file *filp, void __user *buf, goto out; error = BPF_CGROUP_RUN_PROG_SYSCTL(head, table, write, buf, &count, - &new_buf); + ppos, &new_buf); if (error) goto out; |