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home:dirkmueller:acdc:as_python3_module
xen.14764
5e95ad61-xenoprof-clear-buffer-intended-to-be-s...
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File 5e95ad61-xenoprof-clear-buffer-intended-to-be-shared-with-guests.patch of Package xen.14764
Subject: xenoprof: clear buffer intended to be shared with guests From: Jan Beulich jbeulich@suse.com Tue Apr 14 14:32:33 2020 +0200 Date: Tue Apr 14 14:32:33 2020 +0200: Git: 0763a7ebfcdad66cf9e5475a1301eefb29bae9ed alloc_xenheap_pages() making use of MEMF_no_scrub is fine for Xen internally used allocations, but buffers allocated to be shared with (unpriviliged) guests need to be zapped of their prior content. This is part of XSA-313. Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com> Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Wei Liu <wl@xen.org> diff --git a/xen/common/xenoprof.c b/xen/common/xenoprof.c index 4f3e799ebb..4d909fd5d6 100644 --- a/xen/common/xenoprof.c +++ b/xen/common/xenoprof.c @@ -254,6 +254,9 @@ static int alloc_xenoprof_struct( return -ENOMEM; } + for ( i = 0; i < npages; ++i ) + clear_page(d->xenoprof->rawbuf + i * PAGE_SIZE); + d->xenoprof->npages = npages; d->xenoprof->nbuf = nvcpu; d->xenoprof->bufsize = bufsize;
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