diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-05-11 13:59:13 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-12 01:59:16 +0200 |
| commit | 1f466e1f15cf1dac7c86798d694649fc42cd868a (patch) | |
| tree | 1f8ca24224e9aa0dbaf924bec224deb08d1ab505 /Documentation/admin-guide/cgroup-v2.rst | |
| parent | net/scm: cleanup scm_detach_fds (diff) | |
| download | linux-1f466e1f15cf1dac7c86798d694649fc42cd868a.tar.xz linux-1f466e1f15cf1dac7c86798d694649fc42cd868a.zip | |
net: cleanly handle kernel vs user buffers for ->msg_control
The msg_control field in struct msghdr can either contain a user
pointer when used with the recvmsg system call, or a kernel pointer
when used with sendmsg. To complicate things further kernel_recvmsg
can stuff a kernel pointer in and then use set_fs to make the uaccess
helpers accept it.
Replace it with a union of a kernel pointer msg_control field, and
a user pointer msg_control_user one, and allow kernel_recvmsg operate
on a proper kernel pointer using a bitfield to override the normal
choice of a user pointer for recvmsg.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/admin-guide/cgroup-v2.rst')
0 files changed, 0 insertions, 0 deletions