libwine: Use getsegmentdata(3) on Mac OS to find the end of the __TEXT segment.

Don't assume it ends with the fake PE header. This assumption doesn't hold on Mac OS: the __data section where it was placed is located after several other sections, all in the __DATA segment. Unfortunately, this causes Wine, when DEP/NX is turned off, to override the page protections for the start of the __DATA segment, removing write permission from them, leading to a crash when winemac.drv attempted to use an Objective-C class for the first time. Also, be sure to include the zero-fill (i.e. BSS) sections in the total size of the .data section. This should fix some tests that use large uninitialized arrays. Signed-off-by: Chip Davis <cdavis@codeweavers.com> Signed-off-by: Ken Thomases <ken@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

libwine: Use getsegmentdata(3) on Mac OS to find the end of the __TEXT segment.
bdca749f · Chip Davis · Alexandre Julliard · 9b767ad6 · bdca749f
Commit bdca749f authored Aug 01, 2018 by Chip Davis Committed by Alexandre Julliard Aug 16, 2018
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Showing with 16 additions and 3 deletions

loader.c libs/wine/loader.c +16 -3

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--- a/libs/wine/loader.c
+++ b/libs/wine/loader.c
@@ -49,6 +49,7 @@
 #undef LoadResource
 #undef GetCurrentThread
 #include <pthread.h>
+#include <mach-o/getsect.h>
 #else
 extern char **environ;
 #endif
@@ -387,11 +388,15 @@ static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
    IMAGE_NT_HEADERS *nt;
    IMAGE_SECTION_HEADER *sec;
    BYTE *addr;
-    DWORD code_start, data_start, data_end;
+    DWORD code_start, code_end, data_start, data_end;
    const size_t page_size = sysconf( _SC_PAGESIZE );
    const size_t page_mask = page_size - 1;
    int delta, nb_sections = 2;  /* code + data */
    unsigned int i;
+#ifdef __APPLE__
+    Dl_info dli;
+    unsigned long data_size;
+#endif
    size_t size = (sizeof(IMAGE_DOS_HEADER)
                   + sizeof(IMAGE_NT_HEADERS)
@@ -425,7 +430,15 @@ static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
    delta      = (const BYTE *)nt_descr - addr;
    code_start = page_size;
    data_start = delta & ~page_mask;
+#ifdef __APPLE__
+    /* Need the mach_header, not the PE header, to give to getsegmentdata(3) */
+    dladdr(addr, &dli);
+    code_end   = getsegmentdata(dli.dli_fbase, "__DATA", &data_size) - addr;
+    data_end   = (code_end + data_size + page_mask) & ~page_mask;
+#else
+    code_end   = data_start;
    data_end   = (nt->OptionalHeader.SizeOfImage + delta + page_mask) & ~page_mask;
+#endif
    fixup_rva_ptrs( &nt->OptionalHeader.AddressOfEntryPoint, addr, 1 );
@@ -434,7 +447,7 @@ static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
 #ifndef _WIN64
    nt->OptionalHeader.BaseOfData                  = data_start;
 #endif
-    nt->OptionalHeader.SizeOfCode                  = data_start - code_start;
+    nt->OptionalHeader.SizeOfCode                  = code_end - code_start;
    nt->OptionalHeader.SizeOfInitializedData       = data_end - data_start;
    nt->OptionalHeader.SizeOfUninitializedData     = 0;
    nt->OptionalHeader.SizeOfImage                 = data_end;
@@ -443,7 +456,7 @@ static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
    /* Build the code section */
    memcpy( sec->Name, ".text", sizeof(".text") );
-    sec->SizeOfRawData = data_start - code_start;
+    sec->SizeOfRawData = code_end - code_start;
    sec->Misc.VirtualSize = sec->SizeOfRawData;
    sec->VirtualAddress   = code_start;
    sec->PointerToRawData = code_start;