03-25-2009
File permission on : kmem file
Hello ,
I want to check the file permissions of /dev/kmem .
I am getting 2 kind of file perms...
so which permission i have to consider..
here is 2 case ..
1. ls -al /dev/kmem
lrwxrwxrwx 1 root other 27 Sep 8 2008 /dev/kmem -> ../devices/pseudo/mm@0:kmem
2. ls -alLd /dev/kmem
bash-2.03# ls -alL /dev/kmem
crw-r----- 1 root sys 13, 1 Sep 8 2008 /dev/kmem
*********************
Please tell me which is correct file permissions for "/dev/kmem" file.
Thanks
AVKlinux
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MEM(4) Linux Programmer's Manual MEM(4)
NAME
mem, kmem, port - system memory, kernel memory and system ports
DESCRIPTION
mem is a character device file that is an image of the main memory of the computer. It may be used, for example, to examine (and even
patch) the system.
Byte addresses in mem are interpreted as physical memory addresses. References to nonexistent locations cause errors to be returned.
Examining and patching is likely to lead to unexpected results when read-only or write-only bits are present.
It is typically created by:
mknod -m 660 /dev/mem c 1 1
chown root:kmem /dev/mem
The file kmem is the same as mem, except that the kernel virtual memory rather than physical memory is accessed.
It is typically created by:
mknod -m 640 /dev/kmem c 1 2
chown root:kmem /dev/kmem
port is similar to mem, but the I/O ports are accessed.
It is typically created by:
mknod -m 660 /dev/port c 1 4
chown root:mem /dev/port
FILES
/dev/mem
/dev/kmem
/dev/port
SEE ALSO
chown(1), mknod(1), ioperm(2)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 1992-11-21 MEM(4)