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Added patch to implement basic handling of write watches while we're on the signal stack.

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This commit is contained in:
Sebastian Lackner
2015-02-11 13:37:53 +01:00
parent d8772033dd
commit 3f60978f12
6 changed files with 166 additions and 9 deletions
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150
patches/ws2_32-WriteWatches/0005-ntdll-Try-to-handle-write-watches-while-we-re-on-the.patch Normal file
View File

@@ -0,0 +1,150 @@
From d20c4092f475898e7f5236bceb4604bb8c76ab09 Mon Sep 17 00:00:00 2001
From: Sebastian Lackner <sebastian@fds-team.de>
Date: Tue, 10 Feb 2015 14:54:25 +0100
Subject: ntdll: Try to handle write-watches while we're on the signal stack.
(try 2)
Yes, this patch is really necessary. DotNet somehow thinks its a good idea
to store the IO status block in a write-watch protected memory area. If we
do not want to add wine_uninterrupted_write_memory _EVERYWHERE_ in the wine
code, we unfortunately really have to implement exception handling on the
signal stack. This is just a very basic hacky implementation of write-watch
handling, all other kind of exceptions are not handled properly yet.
---
dlls/ntdll/ntdll_misc.h | 2 +-
dlls/ntdll/signal_arm.c | 2 +-
dlls/ntdll/signal_arm64.c | 2 +-
dlls/ntdll/signal_i386.c | 11 ++++++++++-
dlls/ntdll/signal_powerpc.c | 4 ++--
dlls/ntdll/signal_x86_64.c | 2 +-
dlls/ntdll/virtual.c | 4 ++--
7 files changed, 18 insertions(+), 9 deletions(-)
diff --git a/dlls/ntdll/ntdll_misc.h b/dlls/ntdll/ntdll_misc.h
index afd1980..79eea52 100644
--- a/dlls/ntdll/ntdll_misc.h
+++ b/dlls/ntdll/ntdll_misc.h
@@ -169,7 +169,7 @@ extern NTSTATUS virtual_alloc_thread_stack( TEB *teb, SIZE_T reserve_size, SIZE_
extern void virtual_clear_thread_stack(void) DECLSPEC_HIDDEN;
extern BOOL virtual_handle_stack_fault( void *addr ) DECLSPEC_HIDDEN;
extern BOOL virtual_is_valid_code_address( const void *addr, SIZE_T size ) DECLSPEC_HIDDEN;
-extern NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err ) DECLSPEC_HIDDEN;
+extern NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err, BOOL on_signal_stack ) DECLSPEC_HIDDEN;
extern BOOL virtual_check_buffer_for_read( const void *ptr, SIZE_T size ) DECLSPEC_HIDDEN;
extern BOOL virtual_check_buffer_for_write( void *ptr, SIZE_T size ) DECLSPEC_HIDDEN;
extern void VIRTUAL_SetForceExec( BOOL enable ) DECLSPEC_HIDDEN;
diff --git a/dlls/ntdll/signal_arm.c b/dlls/ntdll/signal_arm.c
index e3ae7bd..53a2663 100644
--- a/dlls/ntdll/signal_arm.c
+++ b/dlls/ntdll/signal_arm.c
@@ -443,7 +443,7 @@ static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context
if (rec->NumberParameters == 2)
{
if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
- rec->ExceptionInformation[0] )))
+ rec->ExceptionInformation[0], FALSE )))
goto done;
}
break;
diff --git a/dlls/ntdll/signal_arm64.c b/dlls/ntdll/signal_arm64.c
index 8c8f7af..ccbdf4c 100644
--- a/dlls/ntdll/signal_arm64.c
+++ b/dlls/ntdll/signal_arm64.c
@@ -326,7 +326,7 @@ static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context
if (rec->NumberParameters == 2)
{
if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
- rec->ExceptionInformation[0] )))
+ rec->ExceptionInformation[0], FALSE )))
goto done;
}
break;
diff --git a/dlls/ntdll/signal_i386.c b/dlls/ntdll/signal_i386.c
index de55c31..cf20483 100644
--- a/dlls/ntdll/signal_i386.c
+++ b/dlls/ntdll/signal_i386.c
@@ -1907,7 +1907,7 @@ static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context
if (rec->ExceptionInformation[1] == 0xffffffff && check_invalid_gs( context ))
goto done;
if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
- rec->ExceptionInformation[0] )))
+ rec->ExceptionInformation[0], FALSE )))
goto done;
if (rec->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
rec->ExceptionInformation[0] == EXCEPTION_EXECUTE_FAULT)
@@ -2046,6 +2046,15 @@ static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
ucontext_t *context = sigcontext;
void *stack = init_handler( sigcontext, &fs, &gs );
+ /* check for exceptions on the signal stack caused by write watches */
+ if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
+ (char *)stack >= (char *)get_signal_stack() &&
+ (char *)stack < (char *)get_signal_stack() + signal_stack_size &&
+ !virtual_handle_fault( siginfo->si_addr, (get_error_code(context) >> 1) & 0x09, TRUE ))
+ {
+ return;
+ }
+
/* check for page fault inside the thread stack */
if (get_trap_code(context) == TRAP_x86_PAGEFLT &&
(char *)siginfo->si_addr >= (char *)NtCurrentTeb()->DeallocationStack &&
diff --git a/dlls/ntdll/signal_powerpc.c b/dlls/ntdll/signal_powerpc.c
index 0fca342..886da86 100644
--- a/dlls/ntdll/signal_powerpc.c
+++ b/dlls/ntdll/signal_powerpc.c
@@ -678,7 +678,7 @@ static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
rec.NumberParameters = 2;
rec.ExceptionInformation[0] = 0; /* FIXME ? */
rec.ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
- if (!(rec.ExceptionCode = virtual_handle_fault(siginfo->si_addr, rec.ExceptionInformation[0])))
+ if (!(rec.ExceptionCode = virtual_handle_fault(siginfo->si_addr, rec.ExceptionInformation[0], FALSE)))
goto done;
break;
default:
@@ -701,7 +701,7 @@ static void segv_handler( int signal, siginfo_t *siginfo, void *sigcontext )
rec.NumberParameters = 2;
rec.ExceptionInformation[0] = 0; /* FIXME ? */
rec.ExceptionInformation[1] = (ULONG_PTR)siginfo->si_addr;
- if (!(rec.ExceptionCode = virtual_handle_fault(siginfo->si_addr, rec.ExceptionInformation[0])))
+ if (!(rec.ExceptionCode = virtual_handle_fault(siginfo->si_addr, rec.ExceptionInformation[0], FALSE)))
goto done;
break;
#endif
diff --git a/dlls/ntdll/signal_x86_64.c b/dlls/ntdll/signal_x86_64.c
index c71069d..551687f 100644
--- a/dlls/ntdll/signal_x86_64.c
+++ b/dlls/ntdll/signal_x86_64.c
@@ -2286,7 +2286,7 @@ static void raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
if (rec->NumberParameters == 2)
{
if (!(rec->ExceptionCode = virtual_handle_fault( (void *)rec->ExceptionInformation[1],
- rec->ExceptionInformation[0] )))
+ rec->ExceptionInformation[0], FALSE )))
set_cpu_context( context );
}
break;
diff --git a/dlls/ntdll/virtual.c b/dlls/ntdll/virtual.c
index 36b7662..4392c3e 100644
--- a/dlls/ntdll/virtual.c
+++ b/dlls/ntdll/virtual.c
@@ -1521,7 +1521,7 @@ void virtual_clear_thread_stack(void)
/***********************************************************************
* virtual_handle_fault
*/
-NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err )
+NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err, BOOL on_signal_stack )
{
struct file_view *view;
NTSTATUS ret = STATUS_ACCESS_VIOLATION;
@@ -1542,7 +1542,7 @@ NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err )
/* ignore fault if page is writable now */
if (VIRTUAL_GetUnixProt( *vprot ) & PROT_WRITE) ret = STATUS_SUCCESS;
}
- if (*vprot & VPROT_GUARD)
+ if (!on_signal_stack && (*vprot & VPROT_GUARD))
{
VIRTUAL_SetProt( view, page, page_size, *vprot & ~VPROT_GUARD );
ret = STATUS_GUARD_PAGE_VIOLATION;
--
2.2.2

1
patches/ws2_32-WriteWatches/definition
View File

@@ -1,2 +1,3 @@
Fixes: Avoid race-conditions of async WSARecv() operations with write watches.
Fixes: Avoid race-conditions with write watches in WS2_async_accept.
Fixes: Basic handling of write watches triggered while we're on the signal stack.