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Merge branch 'stable/for-jens-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into for-linus

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Pull xen block changes from Konrad:

Two fixes, both of them spotted by Amazon:

 1) Fix in Xen-blkfront caused by the re-write in 4.8 time-frame.
 2) Fix in the xen_biovec_phys_mergeable which allowed guest
    requests when using NVMe - to slurp up more data than allowed
    leading to an XSA (which has been made public today).
This commit is contained in:
Jens Axboe
2017-08-16 09:56:34 -06:00
parent 3280d66a63 b15bd8cb37
commit 3e09fc802d
2 changed files with 4 additions and 5 deletions
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3
drivers/xen/biomerge.c
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@@ -10,8 +10,7 @@ bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page));
unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page));
return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
((bfn1 == bfn2) || ((bfn1+1) == bfn2));
return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2;
#else
/*
* XXX: Add support for merging bio_vec when using different page