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target-i386: fix CVE-2007-1322

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The icebp instruction can be abused to terminate the emulation,
resulting in denial of service.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5921 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-12-07 18:15:36 +00:00
parent e8e880a72e
commit 0b97134b29
1 changed files with 2 additions and 0 deletions
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2
target-i386/translate.c
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@ -6564,6 +6564,7 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start)
gen_jmp_im(pc_start - s->cs_base);
gen_helper_into(tcg_const_i32(s->pc - pc_start));
break;
#ifdef WANT_ICEBP
case 0xf1: /* icebp (undocumented, exits to external debugger) */
gen_svm_check_intercept(s, pc_start, SVM_EXIT_ICEBP);
#if 1
@ -6574,6 +6575,7 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start)
cpu_set_log(CPU_LOG_INT | CPU_LOG_TB_IN_ASM);
#endif
break;
#endif
case 0xfa: /* cli */
if (!s->vm86) {
if (s->cpl <= s->iopl) {