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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-19 18:09:27 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 20:15:30 +0200
commite530dca584a9aa4aedf26adf0ed3c1c9b80e2767 (patch)
tree2ca93ae3fa0684ec65da2d72084032b8a29c1cb0 /kernel/uid16.c
parent6203deb0a76f35b6dc476fecb228c850099a1bc4 (diff)
downloadlwn-e530dca584a9aa4aedf26adf0ed3c1c9b80e2767.tar.gz
lwn-e530dca584a9aa4aedf26adf0ed3c1c9b80e2767.zip
kernel: provide ksys_*() wrappers for syscalls called by kernel/uid16.c
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>
Diffstat (limited to 'kernel/uid16.c')
-rw-r--r--kernel/uid16.c19
1 files changed, 10 insertions, 9 deletions
diff --git a/kernel/uid16.c b/kernel/uid16.c
index ef1da2a5f9bd..7b930edfe461 100644
--- a/kernel/uid16.c
+++ b/kernel/uid16.c
@@ -18,6 +18,8 @@
#include <linux/uaccess.h>
+#include "uid16.h"
+
SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
{
return sys_chown(filename, low2highuid(user), low2highgid(group));
@@ -35,27 +37,27 @@ SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
{
- return sys_setregid(low2highgid(rgid), low2highgid(egid));
+ return __sys_setregid(low2highgid(rgid), low2highgid(egid));
}
SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
{
- return sys_setgid(low2highgid(gid));
+ return __sys_setgid(low2highgid(gid));
}
SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
{
- return sys_setreuid(low2highuid(ruid), low2highuid(euid));
+ return __sys_setreuid(low2highuid(ruid), low2highuid(euid));
}
SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
{
- return sys_setuid(low2highuid(uid));
+ return __sys_setuid(low2highuid(uid));
}
SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
{
- return sys_setresuid(low2highuid(ruid), low2highuid(euid),
+ return __sys_setresuid(low2highuid(ruid), low2highuid(euid),
low2highuid(suid));
}
@@ -78,11 +80,10 @@ SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruidp, old_uid_t __user *, euid
SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
{
- return sys_setresgid(low2highgid(rgid), low2highgid(egid),
+ return __sys_setresgid(low2highgid(rgid), low2highgid(egid),
low2highgid(sgid));
}
-
SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp)
{
const struct cred *cred = current_cred();
@@ -102,12 +103,12 @@ SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egid
SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
{
- return sys_setfsuid(low2highuid(uid));
+ return __sys_setfsuid(low2highuid(uid));
}
SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
{
- return sys_setfsgid(low2highgid(gid));
+ return __sys_setfsgid(low2highgid(gid));
}
static int groups16_to_user(old_gid_t __user *grouplist,