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server: Clear dr7 before setting other registers. 

Resetting their length to make sure we pass alignment checks both for
their current values and for the new values we'll write.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46472
Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Rémi Bernon 2021-10-29 18:35:13 +02:00 committed by Alexandre Julliard
parent 3d5f8b9869
commit 4db8cdc267
1 changed files with 2 additions and 3 deletions
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5
server/ptrace.c
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@ -633,8 +633,7 @@ void set_thread_context( struct thread *thread, const context_t *context, unsign
switch (context->machine)
{
case IMAGE_FILE_MACHINE_I386:
/* Linux 2.6.33+ does DR0-DR3 alignment validation, so it has to know LEN bits first */
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->debug.i386_regs.dr7 & 0xffff0000 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), 0 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->debug.i386_regs.dr0 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->debug.i386_regs.dr1 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->debug.i386_regs.dr2 ) == -1) goto error;
@ -646,7 +645,7 @@ void set_thread_context( struct thread *thread, const context_t *context, unsign
thread->system_regs |= SERVER_CTX_DEBUG_REGISTERS;
break;
case IMAGE_FILE_MACHINE_AMD64:
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->debug.x86_64_regs.dr7 & 0xffff0000 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), 0 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->debug.x86_64_regs.dr0 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->debug.x86_64_regs.dr1 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->debug.x86_64_regs.dr2 ) == -1) goto error;