linux

iv/linux

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Nam Cao ab4458bc32 riscv: fix overlap of allocated page and PTR_ERR

[ Upstream commit 994af1825a2aa286f4903ff64a1c7378b52defe6 ]

On riscv32, it is possible for the last page in virtual address space
(0xfffff000) to be allocated. This page overlaps with PTR_ERR, so that
shouldn't happen.

There is already some code to ensure memblock won't allocate the last page.
However, buddy allocator is left unchecked.

Fix this by reserving physical memory that would be mapped at virtual
addresses greater than 0xfffff000.

Reported-by: Björn Töpel <bjorn@kernel.org>
Closes: https://lore.kernel.org/linux-riscv/878r1ibpdn.fsf@all.your.base.are.belong.to.us
Fixes: 76d2a0493a17 ("RISC-V: Init and Halt Code")
Signed-off-by: Nam Cao <namcao@linutronix.de>
Cc: <stable@vger.kernel.org>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Link: https://lore.kernel.org/r/20240425115201.3044202-1-namcao@linutronix.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-07-05 09:14:38 +02:00

cacheflush.c

riscv: Fixup race condition on PG_dcache_clean in flush_icache_pte

2023-02-14 19:18:03 +01:00

context.c

riscv: mm: Fix incorrect ASID argument when flushing TLB

2023-03-30 12:47:59 +02:00

extable.c

riscv: abstract out CSR names for supervisor vs machine mode

2019-11-05 09:20:42 -08:00

fault.c

riscv, mm: Perform BPF exhandler fixup on page fault