From: Elizabeth Figura zfigura@codeweavers.com
These are reachable from PE code, but virtual_handle_fault() won't be able to read the instructions. Since these are the only other two cases, just hardcode the addresses specially. --- dlls/ntdll/unix/signal_x86_64.c | 89 +++++++++++++++++++-------------- 1 file changed, 51 insertions(+), 38 deletions(-)
diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c index df231c3f995..6f05212c32d 100644 --- a/dlls/ntdll/unix/signal_x86_64.c +++ b/dlls/ntdll/unix/signal_x86_64.c @@ -2164,6 +2164,10 @@ static BOOL handle_syscall_trap( ucontext_t *sigcontext, siginfo_t *siginfo ) */ static inline BOOL check_invalid_gsbase( ucontext_t *ucontext ) { + extern const void *__wine_syscall_dispatcher_gs_load_ptr; + extern const void *__wine_unix_call_dispatcher_gs_load_ptr; + + const void *rip = (void *)RIP_sig(ucontext); BYTE instr[16]; unsigned int i, len, prefix_count = 0; TEB *teb = NtCurrentTeb(); @@ -2186,48 +2190,51 @@ static inline BOOL check_invalid_gsbase( ucontext_t *ucontext )
if (cur_gsbase == (ULONG_PTR)teb) return FALSE;
- len = virtual_uninterrupted_read_memory( (BYTE *)RIP_sig(ucontext), instr, sizeof(instr) ); - if (!len) return FALSE; - - for (i = 0; i < len; i++) + if (rip != __wine_syscall_dispatcher_gs_load_ptr && rip != __wine_unix_call_dispatcher_gs_load_ptr) { - switch (instr[i]) + len = virtual_uninterrupted_read_memory( rip, instr, sizeof(instr) ); + if (!len) return FALSE; + + for (i = 0; i < len; i++) { - /* instruction prefixes */ - case 0x2e: /* %cs: */ - case 0x36: /* %ss: */ - case 0x3e: /* %ds: */ - case 0x26: /* %es: */ - case 0x40: /* rex */ - case 0x41: /* rex */ - case 0x42: /* rex */ - case 0x43: /* rex */ - case 0x44: /* rex */ - case 0x45: /* rex */ - case 0x46: /* rex */ - case 0x47: /* rex */ - case 0x48: /* rex */ - case 0x49: /* rex */ - case 0x4a: /* rex */ - case 0x4b: /* rex */ - case 0x4c: /* rex */ - case 0x4d: /* rex */ - case 0x4e: /* rex */ - case 0x4f: /* rex */ - case 0x64: /* %fs: */ - case 0x66: /* opcode size */ - case 0x67: /* addr size */ - case 0xf0: /* lock */ - case 0xf2: /* repne */ - case 0xf3: /* repe */ - if (++prefix_count >= 15) return FALSE; - continue; - case 0x65: /* %gs: */ + switch (instr[i]) + { + /* instruction prefixes */ + case 0x2e: /* %cs: */ + case 0x36: /* %ss: */ + case 0x3e: /* %ds: */ + case 0x26: /* %es: */ + case 0x40: /* rex */ + case 0x41: /* rex */ + case 0x42: /* rex */ + case 0x43: /* rex */ + case 0x44: /* rex */ + case 0x45: /* rex */ + case 0x46: /* rex */ + case 0x47: /* rex */ + case 0x48: /* rex */ + case 0x49: /* rex */ + case 0x4a: /* rex */ + case 0x4b: /* rex */ + case 0x4c: /* rex */ + case 0x4d: /* rex */ + case 0x4e: /* rex */ + case 0x4f: /* rex */ + case 0x64: /* %fs: */ + case 0x66: /* opcode size */ + case 0x67: /* addr size */ + case 0xf0: /* lock */ + case 0xf2: /* repne */ + case 0xf3: /* repe */ + if (++prefix_count >= 15) return FALSE; + continue; + case 0x65: /* %gs: */ + break; + default: + return FALSE; + } break; - default: - return FALSE; } - break; }
TRACE( "gsbase %016lx teb %p at instr %p, fixing up\n", cur_gsbase, teb, instr ); @@ -2877,6 +2884,7 @@ __ASM_GLOBAL_FUNC( signal_start_thread, * __wine_syscall_dispatcher */ __ASM_GLOBAL_FUNC( __wine_syscall_dispatcher, + __ASM_LOCAL_LABEL("__wine_syscall_dispatcher_gs_load") ":\n\t" "movq %gs:0x378,%rcx\n\t" /* thread_data->syscall_frame */ "popq 0x70(%rcx)\n\t" /* frame->rip */ __ASM_CFI(".cfi_adjust_cfa_offset -8\n\t") @@ -3203,6 +3211,7 @@ __ASM_GLOBAL_FUNC( __wine_syscall_dispatcher_instrumentation, */ __ASM_GLOBAL_FUNC( __wine_unix_call_dispatcher, "movq %rcx,%r10\n\t" + __ASM_LOCAL_LABEL("__wine_unix_call_dispatcher_gs_load") ":\n\t" "movq %gs:0x378,%rcx\n\t" /* thread_data->syscall_frame */ "popq 0x70(%rcx)\n\t" /* frame->rip */ __ASM_CFI(".cfi_adjust_cfa_offset -8\n\t") @@ -3316,7 +3325,11 @@ __ASM_GLOBAL_FUNC( __wine_unix_call_dispatcher,
__ASM_GLOBAL_POINTER( __ASM_NAME("__wine_syscall_dispatcher_prolog_end_ptr"), __ASM_LOCAL_LABEL("__wine_syscall_dispatcher_prolog_end") ) +__ASM_GLOBAL_POINTER( __ASM_NAME("__wine_syscall_dispatcher_gs_load_ptr"), + __ASM_LOCAL_LABEL("__wine_syscall_dispatcher_gs_load") ) __ASM_GLOBAL_POINTER( __ASM_NAME("__wine_unix_call_dispatcher_prolog_end_ptr"), __ASM_LOCAL_LABEL("__wine_unix_call_dispatcher_prolog_end") ) +__ASM_GLOBAL_POINTER( __ASM_NAME("__wine_unix_call_dispatcher_gs_load_ptr"), + __ASM_LOCAL_LABEL("__wine_unix_call_dispatcher_gs_load") )
#endif /* __x86_64__ */