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ntdll: Don't restore the %fs register for exceptions happening inside system calls. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2021-12-08 15:02:42 +01:00
parent 09f2896d95
commit 0b3d65f822
1 changed files with 2 additions and 2 deletions
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4
dlls/ntdll/unix/signal_x86_64.c
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@ -355,7 +355,7 @@ static inline struct amd64_thread_data *amd64_thread_data(void)
return (struct amd64_thread_data *)ntdll_get_thread_data()->cpu_data;
}
static BOOL is_inside_syscall( ucontext_t *sigcontext )
static BOOL is_inside_syscall( const ucontext_t *sigcontext )
{
return ((char *)RSP_sig(sigcontext) >= (char *)ntdll_get_thread_data()->kernel_stack &&
(char *)RSP_sig(sigcontext) <= (char *)amd64_thread_data()->syscall_frame);
@ -1544,7 +1544,7 @@ static inline void init_handler( const ucontext_t *sigcontext )
static inline void leave_handler( const ucontext_t *sigcontext )
{
#ifdef __linux__
if (fs32_sel && !is_inside_signal_stack( (void *)RSP_sig(sigcontext )))
if (fs32_sel && !is_inside_signal_stack( (void *)RSP_sig(sigcontext )) && !is_inside_syscall(sigcontext))
__asm__ volatile( "movw %0,%%fs" :: "r" (fs32_sel) );
#endif
}