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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-19 18:09:27 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 20:15:30 +0200 |
| commit | e530dca584a9aa4aedf26adf0ed3c1c9b80e2767 (patch) | |
| tree | 2ca93ae3fa0684ec65da2d72084032b8a29c1cb0 /kernel/uid16.c | |
| parent | kernel: add do_compat_sigaltstack() helper; remove in-kernel call to compat s... (diff) | |
| download | linux-e530dca584a9aa4aedf26adf0ed3c1c9b80e2767.tar.xz linux-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.c | 19 |
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, |