From 922b0375fc93fb1a20c5617e37c389c26bbccb70 Mon Sep 17 00:00:00 2001 From: Albert Ou Date: Fri, 27 Sep 2019 16:14:18 -0700 Subject: [PATCH] riscv: Fix memblock reservation for device tree blob This fixes an error with how the FDT blob is reserved in memblock. An incorrect physical address calculation exposed the FDT header to unintended corruption, which typically manifested with of_fdt_raw_init() faulting during late boot after fdt_totalsize() returned a wrong value. Systems with smaller physical memory sizes more frequently trigger this issue, as the kernel is more likely to allocate from the DMA32 zone where bbl places the DTB after the kernel image. Commit 671f9a3e2e24 ("RISC-V: Setup initial page tables in two stages") changed the mapping of the DTB to reside in the fixmap area. Consequently, early_init_fdt_reserve_self() cannot be used anymore in setup_bootmem() since it relies on __pa() to derive a physical address, which does not work with dtb_early_va that is no longer a valid kernel logical address. The reserved[0x1] region shows the effect of the pointer underflow resulting from the __pa(initial_boot_params) offset subtraction: [ 0.000000] MEMBLOCK configuration: [ 0.000000] memory size = 0x000000001fe00000 reserved size = 0x0000000000a2e514 [ 0.000000] memory.cnt = 0x1 [ 0.000000] memory[0x0] [0x0000000080200000-0x000000009fffffff], 0x000000001fe00000 bytes flags: 0x0 [ 0.000000] reserved.cnt = 0x2 [ 0.000000] reserved[0x0] [0x0000000080200000-0x0000000080c2dfeb], 0x0000000000a2dfec bytes flags: 0x0 [ 0.000000] reserved[0x1] [0xfffffff080100000-0xfffffff080100527], 0x0000000000000528 bytes flags: 0x0 With the fix applied: [ 0.000000] MEMBLOCK configuration: [ 0.000000] memory size = 0x000000001fe00000 reserved size = 0x0000000000a2e514 [ 0.000000] memory.cnt = 0x1 [ 0.000000] memory[0x0] [0x0000000080200000-0x000000009fffffff], 0x000000001fe00000 bytes flags: 0x0 [ 0.000000] reserved.cnt = 0x2 [ 0.000000] reserved[0x0] [0x0000000080200000-0x0000000080c2dfeb], 0x0000000000a2dfec bytes flags: 0x0 [ 0.000000] reserved[0x1] [0x0000000080e00000-0x0000000080e00527], 0x0000000000000528 bytes flags: 0x0 Fixes: 671f9a3e2e24 ("RISC-V: Setup initial page tables in two stages") Signed-off-by: Albert Ou Tested-by: Bin Meng Reviewed-by: Anup Patel Signed-off-by: Paul Walmsley --- arch/riscv/mm/init.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index f0ba713..83f7d12 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -82,6 +83,8 @@ disable: } #endif /* CONFIG_BLK_DEV_INITRD */ +static phys_addr_t dtb_early_pa __initdata; + void __init setup_bootmem(void) { struct memblock_region *reg; @@ -117,7 +120,12 @@ void __init setup_bootmem(void) setup_initrd(); #endif /* CONFIG_BLK_DEV_INITRD */ - early_init_fdt_reserve_self(); + /* + * Avoid using early_init_fdt_reserve_self() since __pa() does + * not work for DTB pointers that are fixmap addresses + */ + memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); + early_init_fdt_scan_reserved_mem(); memblock_allow_resize(); memblock_dump_all(); @@ -393,6 +401,8 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) /* Save pointer to DTB for early FDT parsing */ dtb_early_va = (void *)fix_to_virt(FIX_FDT) + (dtb_pa & ~PAGE_MASK); + /* Save physical address for memblock reservation */ + dtb_early_pa = dtb_pa; } static void __init setup_vm_final(void) -- 2.7.4