futex: Mark get_robust_list as deprecated (ec0c4274) · Commits · 戴 / test

Notify get_robust_list users that the syscall is going away. Suggested-by:

Thomas Gleixner <tglx@linutronix.de> Signed-off-by:

Kees Cook <keescook@chromium.org> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Darren Hart <dvhart@linux.intel.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: David Howells <dhowells@redhat.com> Cc: Serge E. Hallyn <serge.hallyn@canonical.com> Cc: kernel-hardening@lists.openwall.com Cc: spender@grsecurity.net Link: http://lkml.kernel.org/r/20120323190855.GA27213@www.outflux.net Signed-off-by:

Thomas Gleixner <tglx@linutronix.de>

Documentation/feature-removal-schedule.txt

+10 −0

Original line number	Diff line number	Diff line
		@@ -529,3 +529,13 @@ When: 3.5
		Why: The old kmap_atomic() with two arguments is deprecated, we only
		keep it for backward compatibility for few cycles and then drop it.
		Who: Cong Wang <amwang@redhat.com>

		----------------------------

		What: get_robust_list syscall
		When: 2013
		Why: There appear to be no production users of the get_robust_list syscall,
		and it runs the risk of leaking address locations, allowing the bypass
		of ASLR. It was only ever intended for debugging, so it should be
		removed.
		Who: Kees Cook <keescook@chromium.org>

kernel/futex.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2449,6 +2449,8 @@ SYSCALL_DEFINE3(get_robust_list, int, pid,
		if (!futex_cmpxchg_enabled)
		return -ENOSYS;

		WARN_ONCE(1, "deprecated: get_robust_list will be deleted in 2013.\n");

		rcu_read_lock();

		ret = -ESRCH;

kernel/futex_compat.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -142,6 +142,8 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
		if (!futex_cmpxchg_enabled)
		return -ENOSYS;

		WARN_ONCE(1, "deprecated: get_robust_list will be deleted in 2013.\n");

		rcu_read_lock();

		ret = -ESRCH;

Admin message