Commit a8d03c3f authored Jul 03, 2019 by Andy Lutomirski Committed by Thomas Gleixner Jul 22, 2019

x86/syscalls: Use the compat versions of rt_sigsuspend() and rt_sigprocmask()

I'm working on some code that detects at build time if there's a
COMPAT_SYSCALL_DEFINE() that is not referenced in the x86 syscall tables.
It catches three offenders: rt_sigsuspend(), rt_sigprocmask(), and
sendfile64().

For rt_sigsuspend() and rt_sigprocmask(), the only potential difference
between the native and compat versions is that the compat version converts
the sigset_t, but, on little endian architectures, the conversion is a
no-op. This is why they both currently work on x86.

To make the code more consistent, and to make the upcoming patches work,
rewire x86 to use the compat vesions.

sendfile64() is more complicated, and will be addressed separately.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/51643ac3157b5921eae0e172a8a0b1d953e68ebb.1562185330.git.luto@kernel.org

parent 45e29d11

arch/x86/entry/syscalls/syscall_32.tbl

+2 −2

Original line number	Diff line number	Diff line
		@@ -186,11 +186,11 @@
		172 i386 prctl sys_prctl __ia32_sys_prctl
		173 i386 rt_sigreturn sys_rt_sigreturn sys32_rt_sigreturn
		174 i386 rt_sigaction sys_rt_sigaction __ia32_compat_sys_rt_sigaction
		175 i386 rt_sigprocmask sys_rt_sigprocmask __ia32_sys_rt_sigprocmask
		175 i386 rt_sigprocmask sys_rt_sigprocmask __ia32_compat_sys_rt_sigprocmask
		176 i386 rt_sigpending sys_rt_sigpending __ia32_compat_sys_rt_sigpending
		177 i386 rt_sigtimedwait sys_rt_sigtimedwait_time32 __ia32_compat_sys_rt_sigtimedwait_time32
		178 i386 rt_sigqueueinfo sys_rt_sigqueueinfo __ia32_compat_sys_rt_sigqueueinfo
		179 i386 rt_sigsuspend sys_rt_sigsuspend __ia32_sys_rt_sigsuspend
		179 i386 rt_sigsuspend sys_rt_sigsuspend __ia32_compat_sys_rt_sigsuspend
		180 i386 pread64 sys_pread64 __ia32_compat_sys_x86_pread
		181 i386 pwrite64 sys_pwrite64 __ia32_compat_sys_x86_pwrite
		182 i386 chown sys_chown16 __ia32_sys_chown16