Commit 9dea5dc9 authored Jul 14, 2015 by Andy Lutomirski Committed by Ingo Molnar Jul 21, 2015

x86/entry/syscalls: Wire up 32-bit direct socket calls



On x86_64, there's no socketcall syscall; instead all of the
socket calls are real syscalls.  For 32-bit programs, we're
stuck offering the socketcall syscall, but it would be nice to
expose the direct calls as well.  This will enable seccomp to
filter socket calls (for new userspace only, but that's fine for
some applications) and it will provide a tiny performance boost.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Alexander Larsson <alexl@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Cosimo Cecchi <cosimo@endlessm.com>
Cc: Dan Nicholson <nicholson@endlessm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
Cc: libc-alpha <libc-alpha@sourceware.org>
Link: http://lkml.kernel.org/r/cb5138299d37d5800e2d135b01a7667fa6115854.1436912629.git.luto@kernel.org


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent ed0b2edb

arch/x86/entry/syscalls/syscall_32.tbl

+15 −0

Original line number	Diff line number	Diff line
		@@ -365,3 +365,18 @@
		356 i386 memfd_create sys_memfd_create
		357 i386 bpf sys_bpf
		358 i386 execveat sys_execveat stub32_execveat
		359 i386 socket sys_socket
		360 i386 socketpair sys_socketpair
		361 i386 bind sys_bind
		362 i386 connect sys_connect
		363 i386 listen sys_listen
		364 i386 accept4 sys_accept4
		365 i386 getsockopt sys_getsockopt compat_sys_getsockopt
		366 i386 setsockopt sys_setsockopt compat_sys_setsockopt
		367 i386 getsockname sys_getsockname
		368 i386 getpeername sys_getpeername
		369 i386 sendto sys_sendto
		370 i386 sendmsg sys_sendmsg compat_sys_sendmsg
		371 i386 recvfrom sys_recvfrom compat_sys_recvfrom
		372 i386 recvmsg sys_recvmsg compat_sys_recvmsg
		373 i386 shutdown sys_shutdown