Kees Cook 8f2af155b5 exec: pass stack rlimit into mm layout functions ... Patch series "exec: Pin stack limit during exec". Attempts to solve problems with the stack limit changing during exec continue to be frustrated[1][2]. In addition to the specific issues around the Stack Clash family of flaws, Andy Lutomirski pointed out[3] other places during exec where the stack limit is used and is assumed to be unchanging. Given the many places it gets used and the fact that it can be manipulated/raced via setrlimit() and prlimit(), I think the only way to handle this is to move away from the "current" view of the stack limit and instead attach it to the bprm, and plumb this down into the functions that need to know the stack limits. This series implements the approach. [1] 04e35f4495 ("exec: avoid RLIMIT_STACK races with prlimit()") [2] 779f4e1c6c ("Revert "exec: avoid RLIMIT_STACK races with prlimit()"") [3] to security@kernel.org, "Subject: existing rlimit races?" This patch (of 3): Since it is possible that the stack rlimit can change externally during exec (either via another thread calling setrlimit() or another process calling prlimit()), provide a way to pass the rlimit down into the per-architecture mm layout functions so that the rlimit can stay in the bprm structure instead of sitting in the signal structure until exec is finalized. Link: http://lkml.kernel.org/r/1518638796-20819-2-git-send-email-keescook@chromium.org Signed-off-by: Kees Cook <keescook@chromium.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Ben Hutchings <ben@decadent.org.uk> Cc: Willy Tarreau <w@1wt.eu> Cc: Hugh Dickins <hughd@google.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: "Jason A. Donenfeld" <Jason@zx2c4.com> Cc: Rik van Riel <riel@redhat.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Greg KH <greg@kroah.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ben Hutchings <ben.hutchings@codethink.co.uk> Cc: Brad Spengler <spender@grsecurity.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2018-04-11 10:28:37 -07:00
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autogroup.h
clock.h
coredump.h
cpufreq.h	sched/cpufreq: Provide migration hint	2018-03-09 07:59:20 +01:00
cputime.h
deadline.h	sched/headers: Simplify and clean up header usage in the scheduler	2018-03-04 12:39:29 +01:00
debug.h
hotplug.h
idle.h
init.h
isolation.h	sched/isolation: Isolate workqueues when "nohz_full=" is set	2018-02-21 09:49:08 +01:00
jobctl.h
loadavg.h
mm.h	exec: pass stack rlimit into mm layout functions	2018-04-11 10:28:37 -07:00
nohz.h	sched/nohz: Clean up nohz enter/exit	2018-03-09 07:59:19 +01:00
numa_balancing.h
prio.h
rt.h
signal.h	usb, signal, security: only pass the cred, not the secid, to kill_pid_info_as_cred and security_task_kill	2018-03-07 09:05:53 +11:00
stat.h
sysctl.h
task_stack.h
task.h	fork: Provide usercopy whitelisting for task_struct	2018-01-15 12:08:04 -08:00
topology.h	sched/cpufreq: Move arch_scale_{freq,cpu}_capacity() outside of #ifdef CONFIG_SMP	2018-01-10 12:53:35 +01:00
user.h	efivarfs: Limit the rate for non-root to read files	2018-02-22 10:21:02 -08:00
wake_q.h
xacct.h