[PATCH v2] ntdll: Avoid overwriting parameters with context in call_user_apc_dispatcher() on x86.
Michael Stefaniuc
mstefani at winehq.org
Mon Nov 16 15:48:23 CST 2020
This fixes the 32 bit kernel32 file test for me too. I don't see a crash but one
CPU being pegged at 100%.
bye
michael
On 11/12/20 3:20 PM, Paul Gofman wrote:
> Fixes crash in 32 bit kernel32 file test. The crash is not always reproducible
> as the issue depends on stack layout.
>
> Signed-off-by: Paul Gofman <pgofman at codeweavers.com>
> ---
> v2:
> - remove leftover debug changes.
>
> dlls/ntdll/unix/signal_i386.c | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/dlls/ntdll/unix/signal_i386.c b/dlls/ntdll/unix/signal_i386.c
> index 4d8eeb2072c..58b79940773 100644
> --- a/dlls/ntdll/unix/signal_i386.c
> +++ b/dlls/ntdll/unix/signal_i386.c
> @@ -1688,15 +1688,18 @@ __ASM_GLOBAL_FUNC( call_user_apc_dispatcher,
> "movl %esp,%ebx\n\t"
> "cmpl %esp,%esi\n\t"
> "cmovbl %esi,%esp\n\t"
> + "pushl 20(%ebx)\n\t" /* func */
> + "pushl 16(%ebx)\n\t" /* arg2 */
> + "pushl 12(%ebx)\n\t" /* arg1 */
> + "movl 8(%ebx),%ebx\n\t" /* ctx */
> "movl $0x00010007,(%esi)\n\t" /* context.ContextFlags = CONTEXT_FULL */
> "pushl %esi\n\t" /* context */
> "pushl $0xfffffffe\n\t"
> "call " __ASM_STDCALL("NtGetContextThread",8) "\n\t"
> "movl $0xc0,0xb0(%esi)\n" /* context.Eax = STATUS_USER_APC */
> - "movl 20(%ebx),%eax\n\t" /* func */
> - "movl 16(%ebx),%ecx\n\t" /* arg2 */
> - "movl 12(%ebx),%edx\n\t" /* arg1 */
> - "movl 8(%ebx),%ebx\n\t" /* ctx */
> + "popl %edx\n\t"
> + "popl %ecx\n\t"
> + "popl %eax\n\t"
> "leal -20(%esi),%esp\n\t"
> "movl %eax,16(%esp)\n" /* func */
> "2:\tmovl %ecx,12(%esp)\n\t" /* arg2 */
>
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