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Add sysctl to retrieve or set umask of another process.

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Submitted by:	Dmitry Banschikov <me ubique spb ru>
Discussed with:	kib, rwatson
Reviewed by:	kib
MFC after:	2 weeks
This commit is contained in:
Mikolaj Golub 2012-02-26 14:25:48 +00:00
parent 1d2ea43149
commit 6ce13747dc
2 changed files with 49 additions and 0 deletions
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48
sys/kern/kern_proc.c
View File

@ -60,6 +60,7 @@ __FBSDID("$FreeBSD$");
#include <sys/sched.h>
#include <sys/smp.h>
#include <sys/stack.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/filedesc.h>
#include <sys/tty.h>
@ -2471,6 +2472,49 @@ sysctl_kern_proc_ps_strings(SYSCTL_HANDLER_ARGS)
return (error);
}
/*
* This sysctl allows a process to retrieve or/and set umask of
* another process.
*/
static int
sysctl_kern_proc_umask(SYSCTL_HANDLER_ARGS)
{
int *name = (int *)arg1;
u_int namelen = arg2;
struct proc *p;
int error;
u_short fd_cmask;
if (namelen != 1)
return (EINVAL);
if (req->newptr != NULL && req->newlen != sizeof(fd_cmask))
return (EINVAL);
error = pget((pid_t)name[0], PGET_WANTREAD, &p);
if (error != 0)
return (error);
FILEDESC_SLOCK(p->p_fd);
fd_cmask = p->p_fd->fd_cmask;
FILEDESC_SUNLOCK(p->p_fd);
error = SYSCTL_OUT(req, &fd_cmask, sizeof(fd_cmask));
if (error != 0)
goto errout;
if (req->newptr != NULL) {
error = SYSCTL_IN(req, &fd_cmask, sizeof(fd_cmask));
if (error == 0) {
FILEDESC_XLOCK(p->p_fd);
p->p_fd->fd_cmask = fd_cmask & ALLPERMS;
FILEDESC_XUNLOCK(p->p_fd);
}
}
errout:
PRELE(p);
return (error);
}
SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table");
SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT|
@ -2572,3 +2616,7 @@ static SYSCTL_NODE(_kern_proc, KERN_PROC_RLIMIT, rlimit, CTLFLAG_RW |
static SYSCTL_NODE(_kern_proc, KERN_PROC_PS_STRINGS, ps_strings, CTLFLAG_RD |
CTLFLAG_MPSAFE, sysctl_kern_proc_ps_strings,
"Process ps_strings location");
static SYSCTL_NODE(_kern_proc, KERN_PROC_UMASK, umask, CTLFLAG_RW |
CTLFLAG_ANYBODY | CTLFLAG_MPSAFE, sysctl_kern_proc_umask,
"Process umask");

1
sys/sys/sysctl.h
View File

@ -563,6 +563,7 @@ SYSCTL_ALLOWED_TYPES(UINT64, uint64_t *a; unsigned long long *b; );
#define KERN_PROC_AUXV 36 /* get ELF auxiliary vector */
#define KERN_PROC_RLIMIT 37 /* process resource limits */
#define KERN_PROC_PS_STRINGS 38 /* get ps_strings location */
#define KERN_PROC_UMASK 39 /* process umask */
/*
* KERN_IPC identifiers