Commit 1c9df907 authored by Willy Tarreau's avatar Willy Tarreau Committed by Linus Torvalds

random: fix circular include dependency on arm64 after addition of percpu.h

Daniel Díaz and Kees Cook independently reported that commit
f227e3ec ("random32: update the net random state on interrupt and
activity") broke arm64 due to a circular dependency on include files
since the addition of percpu.h in random.h.

The correct fix would definitely be to move all the prandom32 stuff out
of random.h but for backporting, a smaller solution is preferred.

This one replaces linux/percpu.h with asm/percpu.h, and this fixes the
problem on x86_64, arm64, arm, and mips.  Note that moving percpu.h
around didn't change anything and that removing it entirely broke
differently.  When backporting, such options might still be considered
if this patch fails to help.

[ It turns out that an alternate fix seems to be to just remove the
  troublesome <asm/pointer_auth.h> remove from the arm64 <asm/smp.h>
  that causes the circular dependency.

  But we might as well do the whole belt-and-suspenders thing, and
  minimize inclusion in <linux/random.h> too. Either will fix the
  problem, and both are good changes.   - Linus ]
Reported-by: default avatarDaniel Díaz <daniel.diaz@linaro.org>
Reported-by: default avatarKees Cook <keescook@chromium.org>
Tested-by: default avatarMarc Zyngier <maz@kernel.org>
Fixes: f227e3ec
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 83bdc727
...@@ -11,7 +11,7 @@ ...@@ -11,7 +11,7 @@
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/list.h> #include <linux/list.h>
#include <linux/once.h> #include <linux/once.h>
#include <linux/percpu.h> #include <asm/percpu.h>
#include <uapi/linux/random.h> #include <uapi/linux/random.h>
......
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