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Message #165757
[Bug 1549601] Re: [Hyper-V] x86, pageattr: prevent overflow in slow_virt_to_phys() for X86_PAE
Hi Joe,
Adrian is from my team and his test results are valid. Can you please confirm that this patch will be included in the March 11th SRUs?
Thank you!
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https://bugs.launchpad.net/bugs/1549601
Title:
[Hyper-V] x86,pageattr: prevent overflow in slow_virt_to_phys() for
X86_PAE
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Trusty:
In Progress
Status in linux source package in Wily:
In Progress
Status in linux source package in Xenial:
In Progress
Bug description:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d1cd1210834649ce1ca6bafe5ac25d2f40331343
x86, pageattr: Prevent overflow in slow_virt_to_phys() for X86_PAE
pte_pfn() returns a PFN of long (32 bits in 32-PAE), so "long <<
PAGE_SHIFT" will overflow for PFNs above 4GB.
Due to this issue, some Linux 32-PAE distros, running as guests on Hyper-V,
with 5GB memory assigned, can't load the netvsc driver successfully and
hence the synthetic network device can't work (we can use the kernel parameter
mem=3000M to work around the issue).
Cast pte_pfn() to phys_addr_t before shifting.
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References