Please pull for 3.5.
The following changes since commit 26c439d4005d94b8da28e023e285fd4a9943470e:
Linus Torvalds (1):
Merge tag 'ecryptfs-3.5-rc6-fixes' of git://git.kernel.org/.../tyhicks/ecryptfs
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security.git for-linus
Andy Lutomirski (1):
security: Minor improvements to no_new_privs documentation
Documentation/prctl/no_new_privs.txt | 7 +++++++
include/linux/prctl.h | 2 ++
2 files changed, 9 insertions(+)
commit c540521bba5d2f24bd2c0417157bfaf8b85e2eee
Author: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Date: Thu Jul 5 11:23:24 2012 -0700
security: Minor improvements to no_new_privs documentation
The documentation didn't actually mention how to enable no_new_privs.
This also adds a note about possible interactions between
no_new_privs and LSMs (i.e. why teaching systemd to set no_new_privs
is not necessarily a good idea), and it references the new docs
from include/linux/prctl.h.
Suggested-by: Rob Landley <rob@xxxxxxxxxxx>
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: James Morris <james.l.morris@xxxxxxxxxx>
diff --git a/Documentation/prctl/no_new_privs.txt b/Documentation/prctl/no_new_privs.txt
index cb705ec..f7be84f 100644
--- a/Documentation/prctl/no_new_privs.txt
+++ b/Documentation/prctl/no_new_privs.txt
@@ -25,6 +25,13 @@ bits will no longer change the uid or gid; file capabilities will not
add to the permitted set, and LSMs will not relax constraints after
execve.
+To set no_new_privs, use prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0).
+
+Be careful, though: LSMs might also not tighten constraints on exec
+in no_new_privs mode. (This means that setting up a general-purpose
+service launcher to set no_new_privs before execing daemons may
+interfere with LSM-based sandboxing.)
+
Note that no_new_privs does not prevent privilege changes that do not
involve execve. An appropriately privileged task can still call
setuid(2) and receive SCM_RIGHTS datagrams.
diff --git a/include/linux/prctl.h b/include/linux/prctl.h
index 3988012..289760f 100644
--- a/include/linux/prctl.h
+++ b/include/linux/prctl.h
@@ -141,6 +141,8 @@
* Changing LSM security domain is considered a new privilege. So, for example,
* asking selinux for a specific new context (e.g. with runcon) will result
* in execve returning -EPERM.
+ *
+ * See Documentation/prctl/no_new_privs.txt for more details.
*/
#define PR_SET_NO_NEW_PRIVS 38
#define PR_GET_NO_NEW_PRIVS 39
--
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