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Make the comments a little more clear about PRIV_KMEM_*, explicitly

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referring to /dev/[k]mem and noting it's about opening the files rather
than actually reading and writing.

Reviewed by:	jmallett
This commit is contained in:
Jamie Gritton 2013-07-06 00:10:52 +00:00
parent d36ed80a7b
commit 1e7df84305
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=252855
2 changed files with 6 additions and 5 deletions
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5
sys/kern/kern_priv.c
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@ -142,8 +142,9 @@ priv_check_cred(struct ucred *cred, int priv, int flags)
}
/*
* Writes to kernel memory are a typical root-only operation,
* but non-root users are expected to be able to read it.
* Writes to kernel/physical memory are a typical root-only operation,
* but non-root users are expected to be able to read it (provided they
* have permission to access /dev/[k]mem).
*/
if (priv == PRIV_KMEM_READ) {
error = 0;

6
sys/sys/priv.h
View File

@ -494,10 +494,10 @@
#define PRIV_RCTL_REMOVE_RULE 674
/*
* Kernel memory privileges.
* mem(4) privileges.
*/
#define PRIV_KMEM_READ 680 /* Read from kernel memory. */
#define PRIV_KMEM_WRITE 681 /* Write to kernel memory. */
#define PRIV_KMEM_READ 680 /* Open mem/kmem for reading. */
#define PRIV_KMEM_WRITE 681 /* Open mem/kmem for writing. */
/*
* Track end of privilege list.