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kernel: open-code sys_rt_sigpending() in sys_sigpending()

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A similar but not fully equivalent code path is already open-coded
three times (in sys_rt_sigpending and in the two compat stubs), so
do it a fourth time here.

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 2018-03-11 11:34:37 +01:00
parent d300b61081
commit d53238cd51
2 changed files with 13 additions and 4 deletions
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2
include/linux/syscalls.h
View File

@ -288,7 +288,7 @@ asmlinkage long sys_capset(cap_user_header_t header,
const cap_user_data_t data);
asmlinkage long sys_personality(unsigned int personality);
asmlinkage long sys_sigpending(old_sigset_t __user *set);
asmlinkage long sys_sigpending(old_sigset_t __user *uset);
asmlinkage long sys_sigprocmask(int how, old_sigset_t __user *set,
old_sigset_t __user *oset);
asmlinkage long sys_sigaltstack(const struct sigaltstack __user *uss,

15
kernel/signal.c
View File

@ -3629,11 +3629,20 @@ int __compat_save_altstack(compat_stack_t __user *uss, unsigned long sp)
/**
* sys_sigpending - examine pending signals
* @set: where mask of pending signal is returned
* @uset: where mask of pending signal is returned
*/
SYSCALL_DEFINE1(sigpending, old_sigset_t __user *, set)
SYSCALL_DEFINE1(sigpending, old_sigset_t __user *, uset)
{
return sys_rt_sigpending((sigset_t __user *)set, sizeof(old_sigset_t));
sigset_t set;
int err;
if (sizeof(old_sigset_t) > sizeof(*uset))
return -EINVAL;
err = do_sigpending(&set);
if (!err && copy_to_user(uset, &set, sizeof(old_sigset_t)))
err = -EFAULT;
return err;
}
#ifdef CONFIG_COMPAT