diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-07-17 08:23:13 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-20 03:16:40 +0200 |
| commit | 4d295e54611509854a12c26f95a6f4430731d614 (patch) | |
| tree | 11f6ced04b1be8c3c59e8d62031c1e4c9f157a36 /net/compat.c | |
| parent | net: streamline __sys_getsockopt (diff) | |
| download | linux-4d295e54611509854a12c26f95a6f4430731d614.tar.xz linux-4d295e54611509854a12c26f95a6f4430731d614.zip | |
net: simplify cBPF setsockopt compat handling
Add a helper that copies either a native or compat bpf_fprog from
userspace after verifying the length, and remove the compat setsockopt
handlers that now aren't required.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/compat.c')
| -rw-r--r-- | net/compat.c | 45 |
1 files changed, 1 insertions, 44 deletions
diff --git a/net/compat.c b/net/compat.c index 5e3041a2c37d..3e6c2c5ff260 100644 --- a/net/compat.c +++ b/net/compat.c @@ -335,49 +335,6 @@ void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) __scm_destroy(scm); } -/* allocate a 64-bit sock_fprog on the user stack for duration of syscall. */ -struct sock_fprog __user *get_compat_bpf_fprog(char __user *optval) -{ - struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; - struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); - struct compat_sock_fprog f32; - struct sock_fprog f; - - if (copy_from_user(&f32, fprog32, sizeof(*fprog32))) - return NULL; - memset(&f, 0, sizeof(f)); - f.len = f32.len; - f.filter = compat_ptr(f32.filter); - if (copy_to_user(kfprog, &f, sizeof(struct sock_fprog))) - return NULL; - - return kfprog; -} -EXPORT_SYMBOL_GPL(get_compat_bpf_fprog); - -static int do_set_attach_filter(struct socket *sock, int level, int optname, - char __user *optval, unsigned int optlen) -{ - struct sock_fprog __user *kfprog; - - kfprog = get_compat_bpf_fprog(optval); - if (!kfprog) - return -EFAULT; - - return sock_setsockopt(sock, level, optname, (char __user *)kfprog, - sizeof(struct sock_fprog)); -} - -static int compat_sock_setsockopt(struct socket *sock, int level, int optname, - char __user *optval, unsigned int optlen) -{ - if (optname == SO_ATTACH_FILTER || - optname == SO_ATTACH_REUSEPORT_CBPF) - return do_set_attach_filter(sock, level, optname, - optval, optlen); - return sock_setsockopt(sock, level, optname, optval, optlen); -} - static int __compat_sys_setsockopt(int fd, int level, int optname, char __user *optval, unsigned int optlen) { @@ -396,7 +353,7 @@ static int __compat_sys_setsockopt(int fd, int level, int optname, } if (level == SOL_SOCKET) - err = compat_sock_setsockopt(sock, level, + err = sock_setsockopt(sock, level, optname, optval, optlen); else if (sock->ops->compat_setsockopt) err = sock->ops->compat_setsockopt(sock, level, |