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Emulate the Linux {get,set}resuid(2) system calls.

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This commit is contained in:
thorpej 1999-05-14 18:44:50 +00:00
parent dd623ce325
commit 8a61761cc5
1 changed files with 105 additions and 1 deletions
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106
sys/compat/linux/common/linux_misc.c
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@ -1,4 +1,4 @@
/* $NetBSD: linux_misc.c,v 1.56 1999/05/13 23:42:34 thorpej Exp $ */
/* $NetBSD: linux_misc.c,v 1.57 1999/05/14 18:44:50 thorpej Exp $ */
/*-
* Copyright (c) 1995, 1998, 1999 The NetBSD Foundation, Inc.
@ -49,8 +49,10 @@
* Function in multiarch:
* linux_sys_break : linux_break.c
* linux_sys_alarm : linux_misc_notalpha.c
* linux_sys_getresgid : linux_misc_notalpha.c
* linux_sys_nice : linux_misc_notalpha.c
* linux_sys_readdir : linux_misc_notalpha.c
* linux_sys_setresgid : linux_misc_notalpha.c
* linux_sys_time : linux_misc_notalpha.c
* linux_sys_utime : linux_misc_notalpha.c
* linux_sys_waitpid : linux_misc_notalpha.c
@ -958,3 +960,105 @@ linux_sys_clone(p, v, retval)
*/
return (fork1(p, flags, sig, SCARG(uap, stack), 0, retval, NULL));
}
int
linux_sys_setresuid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setresuid_args /* {
syscallarg(uid_t) ruid;
syscallarg(uid_t) euid;
syscallarg(uid_t) suid;
} */ *uap = v;
struct pcred *pc = p->p_cred;
uid_t ruid, euid, suid;
int error;
ruid = SCARG(uap, ruid);
euid = SCARG(uap, euid);
suid = SCARG(uap, suid);
/*
* Note: These checks are a little different than the NetBSD
* setreuid(2) call performs. This precisely follows the
* behavior of the Linux kernel.
*/
if (ruid != (uid_t)-1 &&
ruid != pc->p_ruid &&
ruid != pc->pc_ucred->cr_uid &&
ruid != pc->p_svuid &&
(error = suser(pc->pc_ucred, &p->p_acflag)))
return (error);
if (euid != (uid_t)-1 &&
euid != pc->p_ruid &&
euid != pc->pc_ucred->cr_uid &&
euid != pc->p_svuid &&
(error = suser(pc->pc_ucred, &p->p_acflag)))
return (error);
if (suid != (uid_t)-1 &&
suid != pc->p_ruid &&
suid != pc->pc_ucred->cr_uid &&
suid != pc->p_svuid &&
(error = suser(pc->pc_ucred, &p->p_acflag)))
return (error);
/*
* Now assign the new real, effective, and saved UIDs.
* Note that Linux, unlike NetBSD in setreuid(2), does not
* set the saved UID in this call unless the user specifies
* it.
*/
if (ruid != (uid_t)-1) {
(void)chgproccnt(pc->p_ruid, -1);
(void)chgproccnt(ruid, 1);
pc->p_ruid = ruid;
}
if (euid != (uid_t)-1) {
pc->pc_ucred = crcopy(pc->pc_ucred);
pc->pc_ucred->cr_uid = euid;
}
if (suid != (uid_t)-1)
pc->p_svuid = suid;
if (ruid != (uid_t)-1 && euid != (uid_t)-1 && suid != (uid_t)-1)
p->p_flag |= P_SUGID;
return (0);
}
int
linux_sys_getresuid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_getresuid_args /* {
syscallarg(uid_t *) ruid;
syscallarg(uid_t *) euid;
syscallarg(uid_t *) suid;
} */ *uap = v;
struct pcred *pc = p->p_cred;
int error;
/*
* Linux copies these values out to userspace like so:
*
* 1. Copy out ruid.
* 2. If that succeeds, copy out euid.
* 3. If both of those succeed, copy out suid.
*/
if ((error = copyout(&pc->p_ruid, SCARG(uap, ruid),
sizeof(uid_t))) != 0)
return (error);
if ((error = copyout(&pc->pc_ucred->cr_uid, SCARG(uap, euid),
sizeof(uid_t))) != 0)
return (error);
return (copyout(&pc->p_svuid, SCARG(uap, suid), sizeof(uid_t)));
}