diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-07 17:21:59 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-07 17:21:59 -0700 |
commit | a0127afbed65b7b9f8a486c557017eafb4d4c0fc (patch) | |
tree | 13cc11b0eb15128270e323c4053922d39a7343c7 /Documentation/prctl/no_new_privs.txt | |
parent | 332a2e1244bd08b9e3ecd378028513396a004a24 (diff) | |
parent | c540521bba5d2f24bd2c0417157bfaf8b85e2eee (diff) |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
Pull security docs update from James Morris.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
security: Minor improvements to no_new_privs documentation
Diffstat (limited to 'Documentation/prctl/no_new_privs.txt')
-rw-r--r-- | Documentation/prctl/no_new_privs.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/prctl/no_new_privs.txt b/Documentation/prctl/no_new_privs.txt index cb705ec69abe..f7be84fba910 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. |