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kernel: provide ksys_*() wrappers for syscalls called by kernel/uid16.c

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Using these helpers allows us to avoid the in-kernel calls to these
syscalls: sys_setregid(), sys_setgid(), sys_setreuid(), sys_setuid(),
sys_setresuid(), sys_setresgid(), sys_setfsuid(), and sys_setfsgid().

The ksys_ prefix denotes that these function are meant as a drop-in
replacement for the syscall. In particular, they use the same calling
convention.

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: Eric W. Biederman <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski
2018-03-19 18:09:27 +01:00
parent 6203deb0a7
commit e530dca584
3 changed files with 74 additions and 17 deletions
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14
kernel/uid16.h Normal file
View File

@@ -0,0 +1,14 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_UID16_H
#define LINUX_UID16_H
long __sys_setuid(uid_t uid);
long __sys_setgid(gid_t gid);
long __sys_setreuid(uid_t ruid, uid_t euid);
long __sys_setregid(gid_t rgid, gid_t egid);
long __sys_setresuid(uid_t ruid, uid_t euid, uid_t suid);
long __sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid);
long __sys_setfsuid(uid_t uid);
long __sys_setfsgid(gid_t gid);
#endif /* LINUX_UID16_H */