Alexandre Julliard : ntdll: Use virtual_uninterrupted_read_memory() to read code inside signal handler on i386.
Alexandre Julliard
julliard at winehq.org
Fri Sep 13 15:34:19 CDT 2019
Module: wine
Branch: master
Commit: 944c4e8f760460ca6a260573d87c454052caad2c
URL: https://source.winehq.org/git/wine.git/?a=commit;h=944c4e8f760460ca6a260573d87c454052caad2c
Author: Alexandre Julliard <julliard at winehq.org>
Date: Fri Sep 13 17:19:38 2019 +0200
ntdll: Use virtual_uninterrupted_read_memory() to read code inside signal handler on i386.
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
dlls/ntdll/signal_i386.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/dlls/ntdll/signal_i386.c b/dlls/ntdll/signal_i386.c
index 35abc288b3..8d1c591504 100644
--- a/dlls/ntdll/signal_i386.c
+++ b/dlls/ntdll/signal_i386.c
@@ -1530,13 +1530,13 @@ __ASM_STDCALL_FUNC( NtGetContextThread, 8,
*/
static inline DWORD is_privileged_instr( CONTEXT *context )
{
- const BYTE *instr;
- unsigned int prefix_count = 0;
+ BYTE instr[16];
+ unsigned int i, len, prefix_count = 0;
if (!wine_ldt_is_system( context->SegCs )) return 0;
- instr = (BYTE *)context->Eip;
+ len = virtual_uninterrupted_read_memory( (BYTE *)context->Eip, instr, sizeof(instr) );
- for (;;) switch(*instr)
+ for (i = 0; i < len; i++) switch (instr[i])
{
/* instruction prefixes */
case 0x2e: /* %cs: */
@@ -1551,11 +1551,11 @@ static inline DWORD is_privileged_instr( CONTEXT *context )
case 0xf2: /* repne */
case 0xf3: /* repe */
if (++prefix_count >= 15) return EXCEPTION_ILLEGAL_INSTRUCTION;
- instr++;
continue;
case 0x0f: /* extended instruction */
- switch(instr[1])
+ if (i == len - 1) return 0;
+ switch(instr[i + 1])
{
case 0x20: /* mov crX, reg */
case 0x21: /* mov drX, reg */
@@ -1584,6 +1584,7 @@ static inline DWORD is_privileged_instr( CONTEXT *context )
default:
return 0;
}
+ return 0;
}
More information about the wine-cvs
mailing list