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bpf: Add sockptr support for setsockopt

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The whole network stack uses sockptr, and while it doesn't move to
something more modern, let's use sockptr in setsockptr BPF hooks, so, it
could be used by other callers.

The main motivation for this change is to use it in the io_uring
{g,s}etsockopt(), which will use a userspace pointer for *optval, but, a
kernel value for optlen.

Link: https://lore.kernel.org/all/ZSArfLaaGcfd8LH8@gmail.com/

Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20231016134750.1381153-3-leitao@debian.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Breno Leitao 2023-10-16 06:47:40 -07:00 committed by Jens Axboe
parent a615f67e1a
commit 3f31e0d14d
3 changed files with 5 additions and 4 deletions
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2
include/linux/bpf-cgroup.h
View file

@ -137,7 +137,7 @@ int __cgroup_bpf_run_filter_sysctl(struct ctl_table_header *head,
enum cgroup_bpf_attach_type atype);
int __cgroup_bpf_run_filter_setsockopt(struct sock *sock, int *level,
int *optname, char __user *optval,
int *optname, sockptr_t optval,
int *optlen, char **kernel_optval);
int __cgroup_bpf_run_filter_getsockopt(struct sock *sk, int level,

5
kernel/bpf/cgroup.c
View file

@ -1785,7 +1785,7 @@ static bool sockopt_buf_allocated(struct bpf_sockopt_kern *ctx,
}
int __cgroup_bpf_run_filter_setsockopt(struct sock *sk, int *level,
int *optname, char __user *optval,
int *optname, sockptr_t optval,
int *optlen, char **kernel_optval)
{
struct cgroup *cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
@ -1808,7 +1808,8 @@ int __cgroup_bpf_run_filter_setsockopt(struct sock *sk, int *level,
ctx.optlen = *optlen;
if (copy_from_user(ctx.optval, optval, min(*optlen, max_optlen)) != 0) {
if (copy_from_sockptr(ctx.optval, optval,
min(*optlen, max_optlen))) {
ret = -EFAULT;
goto out;
}

2
net/socket.c
View file

@ -2288,7 +2288,7 @@ int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
if (!in_compat_syscall())
err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname,
user_optval, &optlen,
optval, &optlen,
&kernel_optval);
if (err < 0)
goto out_put;