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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-16 17:07:03 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 20:15:20 +0200 |
| commit | 6df354653e8cc07be1f057d9207e1092c0b3963b (patch) | |
| tree | 54c13231160e6a6cc6aa461b91d796ce3cff4518 /net/compat.c | |
| parent | 157b334aa84dc5a4edcbf056b7254263e4112ba8 (diff) | |
| download | lwn-6df354653e8cc07be1f057d9207e1092c0b3963b.tar.gz lwn-6df354653e8cc07be1f057d9207e1092c0b3963b.zip | |
net: socket: add __compat_sys_...msg() helpers; remove in-kernel calls to compat syscalls
Using the net-internal helpers __compat_sys_...msg() allows us to avoid
the internal calls to the compat_sys_...msg() syscalls.
compat_sys_recvmmsg() is handled in a different patch.
This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
Cc: David S. Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'net/compat.c')
| -rw-r--r-- | net/compat.c | 37 |
1 files changed, 30 insertions, 7 deletions
diff --git a/net/compat.c b/net/compat.c index 7b2ae42a1598..5ae7437d3853 100644 --- a/net/compat.c +++ b/net/compat.c @@ -747,25 +747,48 @@ static unsigned char nas[21] = { }; #undef AL -COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) +static inline long __compat_sys_sendmsg(int fd, + struct compat_msghdr __user *msg, + unsigned int flags) { return __sys_sendmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT, false); } -COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, - unsigned int, vlen, unsigned int, flags) +COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, + unsigned int, flags) +{ + return __compat_sys_sendmsg(fd, msg, flags); +} + +static inline long __compat_sys_sendmmsg(int fd, + struct compat_mmsghdr __user *mmsg, + unsigned int vlen, unsigned int flags) { return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, flags | MSG_CMSG_COMPAT, false); } -COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags) +COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg, + unsigned int, vlen, unsigned int, flags) +{ + return __compat_sys_sendmmsg(fd, mmsg, vlen, flags); +} + +static inline long __compat_sys_recvmsg(int fd, + struct compat_msghdr __user *msg, + unsigned int flags) { return __sys_recvmsg(fd, (struct user_msghdr __user *)msg, flags | MSG_CMSG_COMPAT, false); } +COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, + unsigned int, flags) +{ + return __compat_sys_recvmsg(fd, msg, flags); +} + static inline long __compat_sys_recvfrom(int fd, void __user *buf, compat_size_t len, unsigned int flags, struct sockaddr __user *addr, @@ -893,13 +916,13 @@ COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args) compat_ptr(a[4])); break; case SYS_SENDMSG: - ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); + ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); break; case SYS_SENDMMSG: - ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); + ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]); break; case SYS_RECVMSG: - ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); + ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); break; case SYS_RECVMMSG: ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3], |