diff options
| author | Zhenyu Ye <yezhenyu2@huawei.com> | 2021-06-23 15:05:22 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-19 09:44:59 +0200 |
| commit | a11a457820fbb51abd02e35e13e4775a5daf0cb1 (patch) | |
| tree | a539af2530261cbf96765800da18f9c97eca2661 /kernel/cpu.c | |
| parent | 0afa6ad0c49acc3dd7bb94f0f1e0646a25ccae25 (diff) | |
arm64: tlb: fix the TTL value of tlb_get_level
commit 52218fcd61cb42bde0d301db4acb3ffdf3463cc7 upstream.
The TTL field indicates the level of page table walk holding the *leaf*
entry for the address being invalidated. But currently, the TTL field
may be set to an incorrent value in the following stack:
pte_free_tlb
__pte_free_tlb
tlb_remove_table
tlb_table_invalidate
tlb_flush_mmu_tlbonly
tlb_flush
In this case, we just want to flush a PTE page, but the tlb->cleared_pmds
is set and we get tlb_level = 2 in the tlb_get_level() function. This may
cause some unexpected problems.
This patch set the TTL field to 0 if tlb->freed_tables is set. The
tlb->freed_tables indicates page table pages are freed, not the leaf
entry.
Cc: <stable@vger.kernel.org> # 5.9.x
Fixes: c4ab2cbc1d87 ("arm64: tlb: Set the TTL field in flush_tlb_range")
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: ZhuRui <zhurui3@huawei.com>
Signed-off-by: Zhenyu Ye <yezhenyu2@huawei.com>
Link: https://lore.kernel.org/r/b80ead47-1f88-3a00-18e1-cacc22f54cc4@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/cpu.c')
0 files changed, 0 insertions, 0 deletions