From c58f7770456b4665e3cd4fe33ae2bb4fe11397b7 Mon Sep 17 00:00:00 2001 From: Samuel Holland Date: Wed, 14 Aug 2024 02:09:53 -0700 Subject: [PATCH] arm64: Fix KASAN random tag seed initialization [ Upstream commit f75c235565f90c4a17b125e47f1c68ef6b8c2bce ] Currently, kasan_init_sw_tags() is called before setup_per_cpu_areas(), so per_cpu(prng_state, cpu) accesses the same address regardless of the value of "cpu", and the same seed value gets copied to the percpu area for every CPU. Fix this by moving the call to smp_prepare_boot_cpu(), which is the first architecture hook after setup_per_cpu_areas(). Fixes: 3c9e3aa11094 ("kasan: add tag related helper functions") Fixes: 3f41b6093823 ("kasan: fix random seed generation for tag-based mode") Signed-off-by: Samuel Holland Reviewed-by: Andrey Konovalov Link: https://lore.kernel.org/r/20240814091005.969756-1-samuel.holland@sifive.com Signed-off-by: Catalin Marinas Signed-off-by: Sasha Levin --- arch/arm64/kernel/setup.c | 3 --- arch/arm64/kernel/smp.c | 2 ++ 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 417a8a86b2db..c583d1f335f8 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -371,9 +371,6 @@ void __init __no_sanitize_address setup_arch(char **cmdline_p) smp_init_cpus(); smp_build_mpidr_hash(); - /* Init percpu seeds for random tags after cpus are set up. */ - kasan_init_sw_tags(); - #ifdef CONFIG_ARM64_SW_TTBR0_PAN /* * Make sure init_thread_info.ttbr0 always generates translation diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 960b98b43506..14365ef84244 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -459,6 +459,8 @@ void __init smp_prepare_boot_cpu(void) init_gic_priority_masking(); kasan_init_hw_tags(); + /* Init percpu seeds for random tags after cpus are set up. */ + kasan_init_sw_tags(); } /*