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fs: add do_compat_signalfd4() helper; remove in-kernel call to compat syscall

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Using the fs-internal do_compat_signalfd4() helper allows us to get rid of
the fs-internal call to the compat_sys_signalfd4() syscall.

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: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski 2018-03-20 19:36:46 +01:00
parent 05585e4495
commit 570484bfe8
1 changed files with 12 additions and 5 deletions
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17
fs/signalfd.c
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@ -323,10 +323,9 @@ SYSCALL_DEFINE3(signalfd, int, ufd, sigset_t __user *, user_mask,
}
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE4(signalfd4, int, ufd,
const compat_sigset_t __user *,sigmask,
compat_size_t, sigsetsize,
int, flags)
static long do_compat_signalfd4(int ufd,
const compat_sigset_t __user *sigmask,
compat_size_t sigsetsize, int flags)
{
sigset_t tmp;
sigset_t __user *ksigmask;
@ -342,10 +341,18 @@ COMPAT_SYSCALL_DEFINE4(signalfd4, int, ufd,
return do_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
}
COMPAT_SYSCALL_DEFINE4(signalfd4, int, ufd,
const compat_sigset_t __user *, sigmask,
compat_size_t, sigsetsize,
int, flags)
{
return do_compat_signalfd4(ufd, sigmask, sigsetsize, flags);
}
COMPAT_SYSCALL_DEFINE3(signalfd, int, ufd,
const compat_sigset_t __user *,sigmask,
compat_size_t, sigsetsize)
{
return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
return do_compat_signalfd4(ufd, sigmask, sigsetsize, 0);
}
#endif