diff options
| author | Andrew Oates <aoates@google.com> | 2018-08-15 21:19:03 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-08-23 18:46:25 +0200 |
| commit | db7196db5d5d932f388643baae6835f8dcda6921 (patch) | |
| tree | 7c7454ae3b1f769fd3d1e04a0f8f4af8657bd2ca | |
| parent | 0aca060526d3ff9632aaed66e8611814580c13de (diff) | |
target-i386: fix segment limit check in ljmp
The current implementation has three bugs,
* segment limits are not enforced in protected mode if the L bit is set
in the target segment descriptor
* segment limits are not enforced in compatibility mode (ljmp to 32-bit
code segment in long mode)
* #GP(new_cs) is generated rather than #GP(0)
Now the segment limits are enforced if we're not in long mode OR the
target code segment doesn't have the L bit set.
Signed-off-by: Andrew Oates <aoates@google.com>
Message-Id: <20180816011903.39816-1-andrew@andrewoates.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | target/i386/seg_helper.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/target/i386/seg_helper.c b/target/i386/seg_helper.c index b2adddcd7f..d1cbc6ebf0 100644 --- a/target/i386/seg_helper.c +++ b/target/i386/seg_helper.c @@ -1633,8 +1633,8 @@ void helper_ljmp_protected(CPUX86State *env, int new_cs, target_ulong new_eip, } limit = get_seg_limit(e1, e2); if (new_eip > limit && - !(env->hflags & HF_LMA_MASK) && !(e2 & DESC_L_MASK)) { - raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); + (!(env->hflags & HF_LMA_MASK) || !(e2 & DESC_L_MASK))) { + raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); } cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl, get_seg_base(e1, e2), limit, e2); |