Andrew,
2.6.13 incorporated Alan Cox's patch for /proc/sys/fs/suid_dumpable
(one version of this patch can be found here
http://marc.theaimsgroup.com/?l=linux-kernel&m=109647550421014&w=2 ).
This patch also made corresponding changes in kernel/sys.c to
change the prctl() PR_SET_DUMPABLE operation so that the
permitted range of 'arg2' was modified from 0..1 to 0..2.
However, a corresponding change was not made for
PR_GET_DUMPABLE: if the dumpable flag is non-zero, then
PR_GET_DUMPABLE always returns 1, so that the caller can't
determine the true setting of this flag.
I suggest the following small patch. Perhaps Alan has comments.
Cheers,
Michael
--- linux-2.6.14-rc1/kernel/sys.c 2005-09-15 08:21:30.000000000 +0200
+++ linux-2.6.14-rc1-mod/kernel/sys.c 2005-09-16 16:55:29.000000000 +0200
@@ -1729,6 +1729,5 @@
break;
case PR_GET_DUMPABLE:
- if (current->mm->dumpable)
- error = 1;
+ error = current->mm->dumpable;
break;
case PR_SET_DUMPABLE:
--
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