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[PATCH] x86emul: also clip repetition count for STOS
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 17 Apr 2025 11:05:28 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Fabian Specht <f.specht@xxxxxx>, Manuel Andreas <manuel.andreas@xxxxxx>
- Delivery-date: Thu, 17 Apr 2025 09:05:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Like MOVS, INS, and OUTS, STOS also has a special purpose hook, where
the hook function may legitimately have the same expectation as to the
request not straddling address space start/end.
Fixes: 5dfe4aa4eeb6 ("x86_emulate: Do not request emulation of REP instructions
beyond the")
Reported-by: Fabian Specht <f.specht@xxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -2221,7 +2221,7 @@ x86_emulate(
dst.bytes = src.bytes;
dst.mem.seg = x86_seg_es;
- dst.mem.off = truncate_ea(_regs.r(di));
+ dst.mem.off = truncate_ea_and_reps(_regs.r(di), nr_reps, dst.bytes);
if ( (nr_reps == 1) || !ops->rep_stos ||
((rc = ops->rep_stos(&src.val,
dst.mem.seg, dst.mem.off, dst.bytes,
|
