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| author | Christoph Hellwig <hch@lst.de> | 2020-05-11 13:59:13 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-11 16:59:16 -0700 |
| commit | 1f466e1f15cf1dac7c86798d694649fc42cd868a (patch) | |
| tree | 1f8ca24224e9aa0dbaf924bec224deb08d1ab505 /lib/strnlen_user.c | |
| parent | 2618d530dd8b7ac0fdcb83f4c95b88f7b0d37ce6 (diff) | |
| download | linux-1f466e1f15cf1dac7c86798d694649fc42cd868a.tar.bz2 | |
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 'lib/strnlen_user.c')
0 files changed, 0 insertions, 0 deletions