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aa549f923f
Patch series "mm: hwpoison: two more poison recovery".
One more CoW path to support poison recorvery in do_cow_fault(), and the
last copy_user_highpage() user is replaced to copy_mc_user_highpage() from
copy_present_page() during fork to support poison recorvery too.
This patch (of 2):
Like commit a873dfe103 ("mm, hwpoison: try to recover from copy-on
write faults"), there is another path which could crash because it does
not have recovery code where poison is consumed by the kernel in
do_cow_fault(), a crash calltrace shown below on old kernel, but it
could be happened in the lastest mainline code,
CPU: 7 PID: 3248 Comm: mpi Kdump: loaded Tainted: G OE 5.10.0 #1
pc : copy_page+0xc/0xbc
lr : copy_user_highpage+0x50/0x9c
Call trace:
copy_page+0xc/0xbc
do_cow_fault+0x118/0x2bc
do_fault+0x40/0x1a4
handle_pte_fault+0x154/0x230
__handle_mm_fault+0x1a8/0x38c
handle_mm_fault+0xf0/0x250
do_page_fault+0x184/0x454
do_translation_fault+0xac/0xd4
do_mem_abort+0x44/0xbc
Fix it by using copy_mc_user_highpage() to handle this case and return
VM_FAULT_HWPOISON for cow fault.
[wangkefeng.wang@huawei.com: unlock/put vmf->page, per Miaohe]
Link: https://lkml.kernel.org/r/20240910021541.234300-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20240906024201.1214712-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20240906024201.1214712-2-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jiaqi Yan <jiaqiyan@google.com>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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