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SUSE:SLE-12-SP2:GA
xen.11319
5b75afef-x86-setup-avoid-OoB-E820-lookup.patch
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File 5b75afef-x86-setup-avoid-OoB-E820-lookup.patch of Package xen.11319
# Commit 3e4ec07e14bce81f6ae22c31ff1302d1f297a226 # Date 2018-08-16 18:10:07 +0100 # Author Andrew Cooper <andrew.cooper3@citrix.com> # Committer Andrew Cooper <andrew.cooper3@citrix.com> x86/setup: Avoid OoB E820 lookup when calculating the L1TF safe address A number of corner cases (most obviously, no-real-mode and no Multiboot memory map) can end up with e820_raw.nr_map being 0, at which point the L1TF calculation will underflow. Spotted by Coverity. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Wei Liu <wei.liu2@citrix.com> --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -805,7 +805,7 @@ void __init __start_xen(unsigned long mb /* Sanitise the raw E820 map to produce a final clean version. */ max_page = raw_max_page = init_e820(memmap_type, e820_raw, &e820_raw_nr); - if ( !efi_enabled ) + if ( !efi_enabled && e820_raw_nr >= 1 ) { /* * Supplement the heuristics in l1tf_calculations() by assuming that
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