From: Rik van Riel Date: Thu, 17 Aug 2023 17:57:59 +0000 (-0400) Subject: mm,ima,kexec,of: use memblock_free_late from ima_free_kexec_buffer X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f0362a253606e2031f8d61c74195d4d6556e12a4;p=linux.git mm,ima,kexec,of: use memblock_free_late from ima_free_kexec_buffer The code calling ima_free_kexec_buffer runs long after the memblock allocator has already been torn down, potentially resulting in a use after free in memblock_isolate_range. With KASAN or KFENCE, this use after free will result in a BUG from the idle task, and a subsequent kernel panic. Switch ima_free_kexec_buffer over to memblock_free_late to avoid that issue. Fixes: fee3ff99bc67 ("powerpc: Move arch independent ima kexec functions to drivers/of/kexec.c") Cc: stable@kernel.org Signed-off-by: Rik van Riel Suggested-by: Mike Rappoport Link: https://lore.kernel.org/r/20230817135759.0888e5ef@imladris.surriel.com Signed-off-by: Rob Herring --- diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c index f26d2ba8a3715..68278340cecfe 100644 --- a/drivers/of/kexec.c +++ b/drivers/of/kexec.c @@ -184,7 +184,8 @@ int __init ima_free_kexec_buffer(void) if (ret) return ret; - return memblock_phys_free(addr, size); + memblock_free_late(addr, size); + return 0; } #endif