summaryrefslogtreecommitdiff
path: root/kernel/sys.c
diff options
context:
space:
mode:
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/sys.c
parent6203deb0a76f35b6dc476fecb228c850099a1bc4 (diff)
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/sys.c')
-rw-r--r--kernel/sys.c58
1 files changed, 50 insertions, 8 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index ebb138b841c8..550f47788ae4 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -69,6 +69,8 @@
#include <asm/io.h>
#include <asm/unistd.h>
+#include "uid16.h"
+
#ifndef SET_UNALIGN_CTL
# define SET_UNALIGN_CTL(a, b) (-EINVAL)
#endif
@@ -340,7 +342,7 @@ out_unlock:
* operations (as far as semantic preservation is concerned).
*/
#ifdef CONFIG_MULTIUSER
-SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
+long __sys_setregid(gid_t rgid, gid_t egid)
{
struct user_namespace *ns = current_user_ns();
const struct cred *old;
@@ -392,12 +394,17 @@ error:
return retval;
}
+SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
+{
+ return __sys_setregid(rgid, egid);
+}
+
/*
* setgid() is implemented like SysV w/ SAVED_IDS
*
* SMP: Same implicit races as above.
*/
-SYSCALL_DEFINE1(setgid, gid_t, gid)
+long __sys_setgid(gid_t gid)
{
struct user_namespace *ns = current_user_ns();
const struct cred *old;
@@ -429,6 +436,11 @@ error:
return retval;
}
+SYSCALL_DEFINE1(setgid, gid_t, gid)
+{
+ return __sys_setgid(gid);
+}
+
/*
* change the user struct in a credentials set to match the new UID
*/
@@ -473,7 +485,7 @@ static int set_user(struct cred *new)
* 100% compatible with BSD. A program which uses just setuid() will be
* 100% compatible with POSIX with saved IDs.
*/
-SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
+long __sys_setreuid(uid_t ruid, uid_t euid)
{
struct user_namespace *ns = current_user_ns();
const struct cred *old;
@@ -533,6 +545,11 @@ error:
return retval;
}
+SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
+{
+ return __sys_setreuid(ruid, euid);
+}
+
/*
* setuid() is implemented like SysV with SAVED_IDS
*
@@ -544,7 +561,7 @@ error:
* will allow a root program to temporarily drop privileges and be able to
* regain them by swapping the real and effective uid.
*/
-SYSCALL_DEFINE1(setuid, uid_t, uid)
+long __sys_setuid(uid_t uid)
{
struct user_namespace *ns = current_user_ns();
const struct cred *old;
@@ -586,12 +603,17 @@ error:
return retval;
}
+SYSCALL_DEFINE1(setuid, uid_t, uid)
+{
+ return __sys_setuid(uid);
+}
+
/*
* This function implements a generic ability to update ruid, euid,
* and suid. This allows you to implement the 4.4 compatible seteuid().
*/
-SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
+long __sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
{
struct user_namespace *ns = current_user_ns();
const struct cred *old;
@@ -656,6 +678,11 @@ error:
return retval;
}
+SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
+{
+ return __sys_setresuid(ruid, euid, suid);
+}
+
SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp)
{
const struct cred *cred = current_cred();
@@ -678,7 +705,7 @@ SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t _
/*
* Same as above, but for rgid, egid, sgid.
*/
-SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
+long __sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
{
struct user_namespace *ns = current_user_ns();
const struct cred *old;
@@ -730,6 +757,11 @@ error:
return retval;
}
+SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
+{
+ return __sys_setresgid(rgid, egid, sgid);
+}
+
SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp)
{
const struct cred *cred = current_cred();
@@ -757,7 +789,7 @@ SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t _
* whatever uid it wants to). It normally shadows "euid", except when
* explicitly set by setfsuid() or for access..
*/
-SYSCALL_DEFINE1(setfsuid, uid_t, uid)
+long __sys_setfsuid(uid_t uid)
{
const struct cred *old;
struct cred *new;
@@ -793,10 +825,15 @@ change_okay:
return old_fsuid;
}
+SYSCALL_DEFINE1(setfsuid, uid_t, uid)
+{
+ return __sys_setfsuid(uid);
+}
+
/*
* Samma på svenska..
*/
-SYSCALL_DEFINE1(setfsgid, gid_t, gid)
+long __sys_setfsgid(gid_t gid)
{
const struct cred *old;
struct cred *new;
@@ -830,6 +867,11 @@ change_okay:
commit_creds(new);
return old_fsgid;
}
+
+SYSCALL_DEFINE1(setfsgid, gid_t, gid)
+{
+ return __sys_setfsgid(gid);
+}
#endif /* CONFIG_MULTIUSER */
/**