Author: trociny
Date: Sun Feb 26 14:25:48 2012
New Revision: 232181
URL: http://svn.freebsd.org/changeset/base/232181
Log:
Add sysctl to retrieve or set umask of another process.
Submitted by: Dmitry Banschikov <me ubique spb ru>
Discussed with: kib, rwatson
Reviewed by: kib
MFC after: 2 weeks
Modified:
head/sys/kern/kern_proc.c
head/sys/sys/sysctl.h
Modified: head/sys/kern/kern_proc.c
==============================================================================
--- head/sys/kern/kern_proc.c Sun Feb 26 13:57:24 2012 (r232180)
+++ head/sys/kern/kern_proc.c Sun Feb 26 14:25:48 2012 (r232181)
@@ -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_HANDL
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
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");
Modified: head/sys/sys/sysctl.h
==============================================================================
--- head/sys/sys/sysctl.h Sun Feb 26 13:57:24 2012 (r232180)
+++ head/sys/sys/sysctl.h Sun Feb 26 14:25:48 2012 (r232181)
@@ -563,6 +563,7 @@ SYSCTL_ALLOWED_TYPES(UINT64, uint64_t *a
#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
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