You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

David Howells 04c567d931 [PATCH] Keys: Fix race between two instantiators of a key ... Add a revocation notification method to the key type and calls it whilst the key's semaphore is still write-locked after setting the revocation flag. The patch then uses this to maintain a reference on the task_struct of the process that calls request_key() for as long as the authorisation key remains unrevoked. This fixes a potential race between two processes both of which have assumed the authority to instantiate a key (one may have forked the other for example). The problem is that there's no locking around the check for revocation of the auth key and the use of the task_struct it points to, nor does the auth key keep a reference on the task_struct. Access to the "context" pointer in the auth key must thenceforth be done with the auth key semaphore held. The revocation method is called with the target key semaphore held write-locked and the search of the context process's keyrings is done with the auth key semaphore read-locked. The check for the revocation state of the auth key just prior to searching it is done after the auth key is read-locked for the search. This ensures that the auth key can't be revoked between the check and the search. The revocation notification method is added so that the context task_struct can be released as soon as instantiation happens rather than waiting for the auth key to be destroyed, thus avoiding the unnecessary pinning of the requesting process. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
..
keys	[PATCH] Keys: Fix race between two instantiators of a key	19 years ago
selinux	[PATCH] selinux: add hooks for key subsystem	19 years ago
Kconfig	[LSM-IPSec]: Security association restriction.	19 years ago
Makefile	[PATCH] add securityfs for all LSMs to use	20 years ago
capability.c	kbuild: un-stringnify KBUILD_MODNAME	19 years ago
commoncap.c	[PATCH] make cap_ptrace enforce PTRACE_TRACME checks	19 years ago
dummy.c	[PATCH] selinux: add hooks for key subsystem	19 years ago
inode.c	[PATCH] mutex subsystem, semaphore to mutex: VFS, ->i_sem	19 years ago
root_plug.c	Linux-2.6.12-rc2	20 years ago
seclvl.c	[PATCH] Bug fixes and cleanup for the BSD Secure Levels LSM	19 years ago
security.c	[PATCH] refactor capable() to one implementation, add __capable() helper	19 years ago