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authorAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>2019-01-23 11:51:38 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2019-01-31 20:10:15 +1100
commit579b9239c1f38665b21e8d0e6ee83ecc96dbd6bb (patch)
treef42a19c9877dcd2c0f2cc0204ec2b64b99587000 /fs/btrfs
parent7bea7ac0ca0121798f3618d16201ca4dc4e67a00 (diff)
powerpc/radix: Fix kernel crash with mremap()
With support for split pmd lock, we use pmd page pmd_huge_pte pointer to store the deposited page table. In those config when we move page tables we need to make sure we move the deposited page table to the correct pmd page. Otherwise this can result in crash when we withdraw of deposited page table because we can find the pmd_huge_pte NULL. eg: __split_huge_pmd+0x1070/0x1940 __split_huge_pmd+0xe34/0x1940 (unreliable) vma_adjust_trans_huge+0x110/0x1c0 __vma_adjust+0x2b4/0x9b0 __split_vma+0x1b8/0x280 __do_munmap+0x13c/0x550 sys_mremap+0x220/0x7e0 system_call+0x5c/0x70 Fixes: 675d995297d4 ("powerpc/book3s64: Enable split pmd ptlock.") Cc: stable@vger.kernel.org # v4.18+ Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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