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ipc: add msgrcv syscall/compat_syscall wrappers

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Provide ksys_msgrcv() and compat_ksys_msgrcv() wrappers to avoid in-kernel
calls to these syscalls. The ksys_ prefix denotes that these functions are
meant as a drop-in replacement for the syscalls. In particular, they use
the same calling convention as sys_msgrcv() and compat_sys_msgrcv().

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 21:25:57 +01:00
parent e340db5648
commit 078faac9e8
3 changed files with 24 additions and 7 deletions
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8
ipc/syscall.c
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@@ -59,11 +59,11 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
(struct ipc_kludge __user *) ptr,
sizeof(tmp)))
return -EFAULT;
return sys_msgrcv(first, tmp.msgp, second,
return ksys_msgrcv(first, tmp.msgp, second,
tmp.msgtyp, third);
}
default:
return sys_msgrcv(first,
return ksys_msgrcv(first,
(struct msgbuf __user *) ptr,
second, fifth, third);
}
@@ -156,10 +156,10 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
return -EINVAL;
if (copy_from_user(&ipck, uptr, sizeof(ipck)))
return -EFAULT;
return compat_sys_msgrcv(first, ipck.msgp, second,
return compat_ksys_msgrcv(first, ipck.msgp, second,
ipck.msgtyp, third);
}
return compat_sys_msgrcv(first, ptr, second, fifth, third);
return compat_ksys_msgrcv(first, ptr, second, fifth, third);
}
case MSGGET:
return ksys_msgget(first, second);