From: Willy Tarreau w@1wt.eu
commit 1c9df907da83812e4f33b59d3d142c864d9da57f upstream.
Daniel Díaz and Kees Cook independently reported that commit f227e3ec3b5c ("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: Daniel Díaz daniel.diaz@linaro.org Reported-by: Kees Cook keescook@chromium.org Tested-by: Marc Zyngier maz@kernel.org Fixes: f227e3ec3b5c Cc: Stephen Rothwell sfr@canb.auug.org.au Signed-off-by: Willy Tarreau w@1wt.eu Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- include/linux/random.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/random.h +++ b/include/linux/random.h @@ -9,7 +9,7 @@
#include <linux/list.h> #include <linux/once.h> -#include <linux/percpu.h> +#include <asm/percpu.h>
#include <uapi/linux/random.h>