An immutable file can still be touched to change its date. I'm not really
sure if immutable should prohibit that but I think so (since you can't
change permissions on an immutable file) and I think it should.
I traced it to sys_utime() and sys_utimes() in fs/open.c and patched it
there. But after seing directories turning into files (spooky) i tried
again and patched inode_change_ok() in fs/attr.c.
Oh, and a question: does linux even *have* security levels? I assumed it
did since it has immutable files but people say it doesn't have it.
IMPORTANT NOTE:
This patch works for me but am sure Linus will beat me silly for patching
absolutely wrong.
--- linux-2.2.12/fs/attr.c Fri Nov 13 19:07:26 1998
+++ marvin-2.2.12/fs/attr.c Wed Sep 8 20:57:39 1999
@@ -17,6 +17,10 @@
int retval = -EPERM;
unsigned int ia_valid = attr->ia_valid;
+ /* don't touch if immutable */
+ if (IS_IMMUTABLE(inode)) {
+ goto error;
+ }
+
/* If force is set do it anyway. */
if (ia_valid & ATTR_FORCE)
goto fine;
---------
typedef struct me_s {
char name[] = { "Thomas Habets" };
char email[] = { "thomas@habets.pp.se" };
char os[] = { "Linux 2.2" };
char *pgpKey[] = { "finger -m thompa@nss.nu" };
} me_t;
-
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