[PATCH v2 4/5] ntdll: Handle icebp on x86-64.
Zebediah Figura
z.figura12 at gmail.com
Mon Mar 12 23:03:07 CDT 2018
From: Andrew Wesie <awesie at gmail.com>
Signed-off-by: Zebediah Figura <z.figura12 at gmail.com>
---
dlls/ntdll/signal_x86_64.c | 6 ++++++
dlls/ntdll/tests/exception.c | 2 --
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/dlls/ntdll/signal_x86_64.c b/dlls/ntdll/signal_x86_64.c
index 05b0906..ee3d1f9 100644
--- a/dlls/ntdll/signal_x86_64.c
+++ b/dlls/ntdll/signal_x86_64.c
@@ -2917,6 +2917,12 @@ static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
break;
case TRAP_BRKPT: /* Breakpoint exception */
+ /* Check if this is actuallly icebp instruction */
+ if (((unsigned char *)rec->ExceptionAddress)[-1] == 0xF1)
+ {
+ rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
+ break;
+ }
rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
/* fall through */
default:
diff --git a/dlls/ntdll/tests/exception.c b/dlls/ntdll/tests/exception.c
index 7615b5a..320aa77 100644
--- a/dlls/ntdll/tests/exception.c
+++ b/dlls/ntdll/tests/exception.c
@@ -2292,10 +2292,8 @@ static const struct exception
/* 35 */
{ { 0xa3, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc3 }, /* movl %eax,0xffffffffffffffff; ret */
0, 9, STATUS_ACCESS_VIOLATION, 2, { 1, 0xffffffffffffffff } },
-#if 0
{ { 0xf1, 0x90, 0xc3 }, /* icebp; nop; ret */
1, 1, STATUS_SINGLE_STEP, 0 },
-#endif
{ { 0xcd, 0x2c, 0xc3 },
0, 2, STATUS_ASSERTION_FAILURE, 0 },
};
--
2.7.4
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