Support pseudo-reloc version 2
This commit is contained in:
Charles Wilson
parent
dfbf36f8db
commit
dc4e4aabba
6 changed files with 717 additions and 28 deletions
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@ -1,3 +1,32 @@
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2009-10-07 Charles Wilson <cygwin@cwilson.fastmail.fm>
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Additional pseudo-reloc-v2 support
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* ntdll.h: Add custom NTSTATUS value for pseudo-reloc
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errors STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION.
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* pinfo.cc (status_exit): Map custom pseudo-reloc
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error value STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION to 127.
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* sigproc.cc (child_info::proc_retry): Return exit code when
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STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION.
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Cygwin modifications to pseudo-reloc.c
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* lib/pseudo-reloc.c: Added comments throughout and various
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whitespace fixes. Exploit cygwin_internal(CW_EXIT_PROCESS,...)
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for fatal error handling that is consistent with cygwin process
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life-cycle. Ensure state variable (in _pei386_runtime_relocator)
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is unique to each address space, across fork().
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(__print_reloc_error): New function for reporting errors in a
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manner supported by cygwin at this early stage of the process
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life-cycle.
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(_pei386_runtime_relocator): Ensure relocations performed
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only once for each address space, but are repeated after fork()
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in the new address space.
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only once for each address space (e.g. across fork()).
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(__write_memory) [MINGW]: Ensure that b is always initialized
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by call to VirtualQuery, even if -DNDEBUG.
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* lib/pseudo-reloc.c: Import new implementation to support
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v2 pseudo-relocs implemented by Kai Tietz from mingw.
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2009-10-07 Corinna Vinschen <corinna@vinschen.de>
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* syscalls.cc (seteuid32): Call set_cygwin_privileges on primary token
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@ -1,6 +1,9 @@
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/* pseudo-reloc.c
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Written by Egor Duda <deo@logos-m.ru>
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Contributed by Egor Duda <deo@logos-m.ru>
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Modified by addition of runtime_pseudo_reloc version 2
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by Kai Tietz <kai.tietz@onevision.com>
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THIS SOFTWARE IS NOT COPYRIGHTED
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This source code is offered for use in the public domain. You may
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@ -13,33 +16,356 @@
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*/
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#include <windows.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#if defined(__CYGWIN__)
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#include <wchar.h>
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#include <ntdef.h>
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#include <stdarg.h>
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#include <sys/cygwin.h>
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/* copied from winsup.h */
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# define NO_COPY __attribute__((nocommon)) __attribute__((section(".data_cygwin_nocopy")))
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/* custom status code: */
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#define STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION ((NTSTATUS) 0xe0000269)
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#else
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# define NO_COPY
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#endif
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extern char __RUNTIME_PSEUDO_RELOC_LIST__;
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extern char __RUNTIME_PSEUDO_RELOC_LIST_END__;
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extern char _image_base__;
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typedef struct
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{
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DWORD addend;
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DWORD target;
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}
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runtime_pseudo_reloc;
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/* v1 relocation is basically:
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* *(base + .target) += .addend
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* where (base + .target) is always assumed to point
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* to a DWORD (4 bytes).
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*/
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typedef struct {
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DWORD addend;
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DWORD target;
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} runtime_pseudo_reloc_item_v1;
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void
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do_pseudo_reloc (void* start, void* end, void* base)
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/* v2 relocation is more complex. In effect, it is
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* *(base + .target) += *(base + .sym) - (base + .sym)
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* with care taken in both reading, sign extension, and writing
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* because .flags may indicate that (base + .target) may point
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* to a BYTE, WORD, DWORD, or QWORD (w64).
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*/
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typedef struct {
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DWORD sym;
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DWORD target;
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DWORD flags;
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} runtime_pseudo_reloc_item_v2;
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typedef struct {
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DWORD magic1;
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DWORD magic2;
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DWORD version;
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} runtime_pseudo_reloc_v2;
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#if defined(__CYGWIN__)
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#define SHORT_MSG_BUF_SZ 128
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/* This function is used to print short error messages
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* to stderr, which may occur during DLL initialization
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* while fixing up 'pseudo' relocations. This early, we
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* may not be able to use cygwin stdio functions, so we
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* use the win32 WriteFile api. This should work with both
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* normal win32 console IO handles, redirected ones, and
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* cygwin ptys.
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*/
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static BOOL
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__print_reloc_error (const char *fmt, ...)
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{
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DWORD reloc_target;
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runtime_pseudo_reloc* r;
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for (r = (runtime_pseudo_reloc*) start; r < (runtime_pseudo_reloc*) end; r++)
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char buf[SHORT_MSG_BUF_SZ];
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wchar_t module[MAX_PATH];
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char * posix_module = NULL;
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BOOL rVal = FALSE;
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static const char * UNKNOWN_MODULE = "<unknown module>: ";
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DWORD len;
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DWORD done;
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va_list args;
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HANDLE errh = GetStdHandle (STD_ERROR_HANDLE);
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ssize_t modulelen = GetModuleFileNameW (NULL, module, sizeof (module));
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if (errh == INVALID_HANDLE_VALUE)
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return FALSE;
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if (modulelen > 0)
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posix_module = cygwin_create_path (CCP_WIN_W_TO_POSIX, module);
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va_start (args, fmt);
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len = (DWORD) vsnprintf (buf, SHORT_MSG_BUF_SZ, fmt, args);
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va_end (args);
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buf[SHORT_MSG_BUF_SZ-1] = '\0'; /* paranoia */
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if (posix_module)
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{
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reloc_target = (DWORD) base + r->target;
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*((DWORD*) reloc_target) += r->addend;
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rVal = WriteFile (errh, (PCVOID)posix_module,
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strlen(posix_module), &done, NULL) &&
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WriteFile (errh, (PCVOID)": ", 2, &done, NULL) &&
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WriteFile (errh, (PCVOID)buf, len, &done, NULL);
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free (posix_module);
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}
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else
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{
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rVal = WriteFile (errh, (PCVOID)UNKNOWN_MODULE,
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sizeof(UNKNOWN_MODULE), &done, NULL) &&
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WriteFile (errh, (PCVOID)buf, len, &done, NULL);
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}
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return rVal;
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}
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#endif /* __CYGWIN__ */
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/* This function temporarily marks the page containing addr
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* writable, before copying len bytes from *src to *addr, and
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* then restores the original protection settings to the page.
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*
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* Using this function eliminates the requirement with older
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* pseudo-reloc implementations, that sections containing
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* pseudo-relocs (such as .text and .rdata) be permanently
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* marked writable. This older behavior sabotaged any memory
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* savings achieved by shared libraries on win32 -- and was
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* slower, too. However, on cygwin as of binutils 2.20 the
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* .text section is still marked writable, and the .rdata section
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* is folded into the (writable) .data when --enable-auto-import.
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*/
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static void
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__write_memory (void *addr,const void *src,size_t len)
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{
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MEMORY_BASIC_INFORMATION b;
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DWORD oldprot;
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SIZE_T memsz;
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if (!len)
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return;
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memsz = VirtualQuery (addr, &b, sizeof(b));
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#if defined(__CYGWIN__)
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/* CYGWIN: If error, print error message and die. */
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if (memsz == 0)
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{
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__print_reloc_error (
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"error while loading shared libraries: bad address specified 0x%08x.\n",
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addr);
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cygwin_internal (CW_EXIT_PROCESS,
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STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION,
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1);
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}
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#else
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/* MINGW: If error, die. assert() may print error message when !NDEBUG */
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assert (memsz);
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#endif
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/* Temporarily allow write access to read-only protected memory. */
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if (b.Protect != PAGE_EXECUTE_READWRITE && b.Protect != PAGE_READWRITE)
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VirtualProtect (b.BaseAddress, b.RegionSize, PAGE_EXECUTE_READWRITE,
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&oldprot);
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/* write the data. */
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memcpy (addr, src, len);
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/* Restore original protection. */
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if (b.Protect != PAGE_EXECUTE_READWRITE && b.Protect != PAGE_READWRITE)
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VirtualProtect (b.BaseAddress, b.RegionSize, oldprot, &oldprot);
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}
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#define RP_VERSION_V1 0
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#define RP_VERSION_V2 1
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static void
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do_pseudo_reloc (void * start, void * end, void * base)
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{
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ptrdiff_t addr_imp, reldata;
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ptrdiff_t reloc_target = (ptrdiff_t) ((char *)end - (char*)start);
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runtime_pseudo_reloc_v2 *v2_hdr = (runtime_pseudo_reloc_v2 *) start;
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runtime_pseudo_reloc_item_v2 *r;
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/* A valid relocation list will contain at least one entry, and
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* one v1 data structure (the smallest one) requires two DWORDs.
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* So, if the relocation list is smaller than 8 bytes, bail.
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*/
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if (reloc_target < 8)
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return;
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/* Check if this is the old pseudo relocation version. */
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/* There are two kinds of v1 relocation lists:
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* 1) With a (v2-style) version header. In this case, the
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* first entry in the list is a 3-DWORD structure, with
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* value:
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* { 0, 0, RP_VERSION_V1 }
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* In this case, we skip to the next entry in the list,
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* knowing that all elements after the head item can
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* be cast to runtime_pseudo_reloc_item_v1.
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* 2) Without a (v2-style) version header. In this case, the
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* first element in the list IS an actual v1 relocation
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* record, which is two DWORDs. Because there will never
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* be a case where a v1 relocation record has both
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* addend == 0 and target == 0, this case will not be
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* confused with the prior one.
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* All current binutils, when generating a v1 relocation list,
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* use the second (e.g. original) form -- that is, without the
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* v2-style version header.
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*/
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if (reloc_target >= 12
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&& v2_hdr->magic1 == 0 && v2_hdr->magic2 == 0
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&& v2_hdr->version == RP_VERSION_V1)
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{
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/* We have a list header item indicating that the rest
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* of the list contains v1 entries. Move the pointer to
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* the first true v1 relocation record. By definition,
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* that v1 element will not have both addend == 0 and
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* target == 0 (and thus, when interpreted as a
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* runtime_pseudo_reloc_v2, it will not have both
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* magic1 == 0 and magic2 == 0).
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*/
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v2_hdr++;
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}
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if (v2_hdr->magic1 != 0 || v2_hdr->magic2 != 0)
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{
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/*************************
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* Handle v1 relocations *
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*************************/
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runtime_pseudo_reloc_item_v1 * o;
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for (o = (runtime_pseudo_reloc_item_v1 *) v2_hdr;
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o < (runtime_pseudo_reloc_item_v1 *)end;
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o++)
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{
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DWORD newval;
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reloc_target = (ptrdiff_t) base + o->target;
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newval = (*((DWORD*) reloc_target)) + o->addend;
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__write_memory ((void *) reloc_target, &newval, sizeof(DWORD));
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}
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return;
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}
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/* If we got this far, then we have relocations of version 2 or newer */
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/* Check if this is a known version. */
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if (v2_hdr->version != RP_VERSION_V2)
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{
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#if defined(__CYGWIN__)
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/* CYGWIN: Print error message and die, even when !DEBUGGING */
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__print_reloc_error (
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"error while loading shared libraries: invalid pseudo_reloc version %d.\n",
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(int) v2_hdr->version);
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cygwin_internal (CW_EXIT_PROCESS,
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STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION,
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1);
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#else
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# if defined(DEBUG)
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/* MINGW: Don't die; just return to caller. If DEBUG, print error message. */
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fprintf (stderr, "internal mingw runtime error:"
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"psuedo_reloc version %d is unknown to this runtime.\n",
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(int) v2_hdr->version);
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# endif
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#endif
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return;
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}
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/*************************
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* Handle v2 relocations *
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*************************/
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/* Walk over header. */
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r = (runtime_pseudo_reloc_item_v2 *) &v2_hdr[1];
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for (; r < (runtime_pseudo_reloc_item_v2 *) end; r++)
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{
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/* location where new address will be written */
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reloc_target = (ptrdiff_t) base + r->target;
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/* get sym pointer. It points either to the iat entry
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* of the referenced element, or to the stub function.
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*/
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addr_imp = (ptrdiff_t) base + r->sym;
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addr_imp = *((ptrdiff_t *) addr_imp);
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/* read existing relocation value from image, casting to the
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* bitsize indicated by the 8 LSBs of flags. If the value is
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* negative, manually sign-extend to ptrdiff_t width. Raise an
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* error if the bitsize indicated by the 8 LSBs of flags is not
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* supported.
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*/
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switch ((r->flags & 0xff))
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{
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case 8:
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reldata = (ptrdiff_t) (*((unsigned char *)reloc_target));
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if ((reldata & 0x80) != 0)
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reldata |= ~((ptrdiff_t) 0xff);
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break;
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case 16:
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reldata = (ptrdiff_t) (*((unsigned short *)reloc_target));
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if ((reldata & 0x8000) != 0)
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reldata |= ~((ptrdiff_t) 0xffff);
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break;
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case 32:
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reldata = (ptrdiff_t) (*((unsigned int *)reloc_target));
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#ifdef _WIN64
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if ((reldata & 0x80000000) != 0)
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reldata |= ~((ptrdiff_t) 0xffffffff);
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#endif
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break;
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#ifdef _WIN64
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case 64:
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reldata = (ptrdiff_t) (*((unsigned long long *)reloc_target));
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break;
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#endif
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default:
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reldata=0;
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#if defined(__CYGWIN__)
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/* Print error message and die, even when !DEBUGGING */
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__print_reloc_error (
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"error while loading shared libraries: unknown pseudo_reloc bit size %d.\n",
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(int) (r->flags & 0xff));
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cygwin_internal (CW_EXIT_PROCESS,
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STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION,
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1);
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#else
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# ifdef DEBUG
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/* MINGW: If error, don't die; just print message if DEBUG */
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fprintf(stderr, "internal mingw runtime error: "
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"unknown pseudo_reloc bit size %d\n",
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(int) (r->flags & 0xff));
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# endif
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#endif
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break;
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}
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/* Adjust the relocation value */
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reldata -= ((ptrdiff_t) base + r->sym);
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reldata += addr_imp;
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/* Write the new relocation value back to *reloc_target */
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switch ((r->flags & 0xff))
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{
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case 8:
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__write_memory ((void *) reloc_target, &reldata, 1);
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break;
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case 16:
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__write_memory ((void *) reloc_target, &reldata, 2);
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break;
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case 32:
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__write_memory ((void *) reloc_target, &reldata, 4);
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break;
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#ifdef _WIN64
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case 64:
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__write_memory ((void *) reloc_target, &reldata, 8);
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break;
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#endif
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}
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}
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}
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void
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_pei386_runtime_relocator ()
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{
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static NO_COPY int was_init = 0;
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if (was_init)
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return;
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++was_init;
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do_pseudo_reloc (&__RUNTIME_PSEUDO_RELOC_LIST__,
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&__RUNTIME_PSEUDO_RELOC_LIST_END__,
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&_image_base__);
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@ -46,6 +46,8 @@
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#define STATUS_ENTRYPOINT_NOT_FOUND ((NTSTATUS) 0xc0000139)
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#define STATUS_BAD_DLL_ENTRYPOINT ((NTSTATUS) 0xc0000251)
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#define STATUS_ILLEGAL_DLL_RELOCATION ((NTSTATUS) 0xc0000269)
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/* custom status code: */
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#define STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION ((NTSTATUS) 0xe0000269)
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#define PDI_MODULES 0x01
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#define PDI_HEAPS 0x04
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@ -128,6 +128,10 @@ status_exit (DWORD x)
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x = 127;
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}
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break;
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case STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION: /* custom error value */
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/* We've already printed the error message in pseudo-reloc.c */
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x = 127;
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break;
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default:
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x = 127;
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}
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@ -1,6 +1,9 @@
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/* pseudo-reloc.c
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Written by Egor Duda <deo@logos-m.ru>
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Contributed by Egor Duda <deo@logos-m.ru>
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||||
Modified by addition of runtime_pseudo_reloc version 2
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by Kai Tietz <kai.tietz@onevision.com>
|
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|
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THIS SOFTWARE IS NOT COPYRIGHTED
|
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|
||||
This source code is offered for use in the public domain. You may
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@ -13,33 +16,356 @@
|
|||
*/
|
||||
|
||||
#include <windows.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <assert.h>
|
||||
|
||||
#if defined(__CYGWIN__)
|
||||
#include <wchar.h>
|
||||
#include <ntdef.h>
|
||||
#include <stdarg.h>
|
||||
#include <sys/cygwin.h>
|
||||
/* copied from winsup.h */
|
||||
# define NO_COPY __attribute__((nocommon)) __attribute__((section(".data_cygwin_nocopy")))
|
||||
/* custom status code: */
|
||||
#define STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION ((NTSTATUS) 0xe0000269)
|
||||
#else
|
||||
# define NO_COPY
|
||||
#endif
|
||||
|
||||
extern char __RUNTIME_PSEUDO_RELOC_LIST__;
|
||||
extern char __RUNTIME_PSEUDO_RELOC_LIST_END__;
|
||||
extern char _image_base__;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
DWORD addend;
|
||||
DWORD target;
|
||||
}
|
||||
runtime_pseudo_reloc;
|
||||
/* v1 relocation is basically:
|
||||
* *(base + .target) += .addend
|
||||
* where (base + .target) is always assumed to point
|
||||
* to a DWORD (4 bytes).
|
||||
*/
|
||||
typedef struct {
|
||||
DWORD addend;
|
||||
DWORD target;
|
||||
} runtime_pseudo_reloc_item_v1;
|
||||
|
||||
void
|
||||
do_pseudo_reloc (void* start, void* end, void* base)
|
||||
/* v2 relocation is more complex. In effect, it is
|
||||
* *(base + .target) += *(base + .sym) - (base + .sym)
|
||||
* with care taken in both reading, sign extension, and writing
|
||||
* because .flags may indicate that (base + .target) may point
|
||||
* to a BYTE, WORD, DWORD, or QWORD (w64).
|
||||
*/
|
||||
typedef struct {
|
||||
DWORD sym;
|
||||
DWORD target;
|
||||
DWORD flags;
|
||||
} runtime_pseudo_reloc_item_v2;
|
||||
|
||||
typedef struct {
|
||||
DWORD magic1;
|
||||
DWORD magic2;
|
||||
DWORD version;
|
||||
} runtime_pseudo_reloc_v2;
|
||||
|
||||
#if defined(__CYGWIN__)
|
||||
#define SHORT_MSG_BUF_SZ 128
|
||||
/* This function is used to print short error messages
|
||||
* to stderr, which may occur during DLL initialization
|
||||
* while fixing up 'pseudo' relocations. This early, we
|
||||
* may not be able to use cygwin stdio functions, so we
|
||||
* use the win32 WriteFile api. This should work with both
|
||||
* normal win32 console IO handles, redirected ones, and
|
||||
* cygwin ptys.
|
||||
*/
|
||||
static BOOL
|
||||
__print_reloc_error (const char *fmt, ...)
|
||||
{
|
||||
DWORD reloc_target;
|
||||
runtime_pseudo_reloc* r;
|
||||
for (r = (runtime_pseudo_reloc*) start; r < (runtime_pseudo_reloc*) end; r++)
|
||||
char buf[SHORT_MSG_BUF_SZ];
|
||||
wchar_t module[MAX_PATH];
|
||||
char * posix_module = NULL;
|
||||
BOOL rVal = FALSE;
|
||||
static const char * UNKNOWN_MODULE = "<unknown module>: ";
|
||||
DWORD len;
|
||||
DWORD done;
|
||||
va_list args;
|
||||
HANDLE errh = GetStdHandle (STD_ERROR_HANDLE);
|
||||
ssize_t modulelen = GetModuleFileNameW (NULL, module, sizeof (module));
|
||||
|
||||
if (errh == INVALID_HANDLE_VALUE)
|
||||
return FALSE;
|
||||
|
||||
if (modulelen > 0)
|
||||
posix_module = cygwin_create_path (CCP_WIN_W_TO_POSIX, module);
|
||||
|
||||
va_start (args, fmt);
|
||||
len = (DWORD) vsnprintf (buf, SHORT_MSG_BUF_SZ, fmt, args);
|
||||
va_end (args);
|
||||
buf[SHORT_MSG_BUF_SZ-1] = '\0'; /* paranoia */
|
||||
|
||||
if (posix_module)
|
||||
{
|
||||
reloc_target = (DWORD) base + r->target;
|
||||
*((DWORD*) reloc_target) += r->addend;
|
||||
rVal = WriteFile (errh, (PCVOID)posix_module,
|
||||
strlen(posix_module), &done, NULL) &&
|
||||
WriteFile (errh, (PCVOID)": ", 2, &done, NULL) &&
|
||||
WriteFile (errh, (PCVOID)buf, len, &done, NULL);
|
||||
free (posix_module);
|
||||
}
|
||||
else
|
||||
{
|
||||
rVal = WriteFile (errh, (PCVOID)UNKNOWN_MODULE,
|
||||
sizeof(UNKNOWN_MODULE), &done, NULL) &&
|
||||
WriteFile (errh, (PCVOID)buf, len, &done, NULL);
|
||||
}
|
||||
return rVal;
|
||||
}
|
||||
#endif /* __CYGWIN__ */
|
||||
|
||||
/* This function temporarily marks the page containing addr
|
||||
* writable, before copying len bytes from *src to *addr, and
|
||||
* then restores the original protection settings to the page.
|
||||
*
|
||||
* Using this function eliminates the requirement with older
|
||||
* pseudo-reloc implementations, that sections containing
|
||||
* pseudo-relocs (such as .text and .rdata) be permanently
|
||||
* marked writable. This older behavior sabotaged any memory
|
||||
* savings achieved by shared libraries on win32 -- and was
|
||||
* slower, too. However, on cygwin as of binutils 2.20 the
|
||||
* .text section is still marked writable, and the .rdata section
|
||||
* is folded into the (writable) .data when --enable-auto-import.
|
||||
*/
|
||||
static void
|
||||
__write_memory (void *addr,const void *src,size_t len)
|
||||
{
|
||||
MEMORY_BASIC_INFORMATION b;
|
||||
DWORD oldprot;
|
||||
SIZE_T memsz;
|
||||
|
||||
if (!len)
|
||||
return;
|
||||
|
||||
memsz = VirtualQuery (addr, &b, sizeof(b));
|
||||
|
||||
#if defined(__CYGWIN__)
|
||||
/* CYGWIN: If error, print error message and die. */
|
||||
if (memsz == 0)
|
||||
{
|
||||
__print_reloc_error (
|
||||
"error while loading shared libraries: bad address specified 0x%08x.\n",
|
||||
addr);
|
||||
cygwin_internal (CW_EXIT_PROCESS,
|
||||
STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION,
|
||||
1);
|
||||
}
|
||||
#else
|
||||
/* MINGW: If error, die. assert() may print error message when !NDEBUG */
|
||||
assert (memsz);
|
||||
#endif
|
||||
|
||||
/* Temporarily allow write access to read-only protected memory. */
|
||||
if (b.Protect != PAGE_EXECUTE_READWRITE && b.Protect != PAGE_READWRITE)
|
||||
VirtualProtect (b.BaseAddress, b.RegionSize, PAGE_EXECUTE_READWRITE,
|
||||
&oldprot);
|
||||
/* write the data. */
|
||||
memcpy (addr, src, len);
|
||||
/* Restore original protection. */
|
||||
if (b.Protect != PAGE_EXECUTE_READWRITE && b.Protect != PAGE_READWRITE)
|
||||
VirtualProtect (b.BaseAddress, b.RegionSize, oldprot, &oldprot);
|
||||
}
|
||||
|
||||
#define RP_VERSION_V1 0
|
||||
#define RP_VERSION_V2 1
|
||||
|
||||
static void
|
||||
do_pseudo_reloc (void * start, void * end, void * base)
|
||||
{
|
||||
ptrdiff_t addr_imp, reldata;
|
||||
ptrdiff_t reloc_target = (ptrdiff_t) ((char *)end - (char*)start);
|
||||
runtime_pseudo_reloc_v2 *v2_hdr = (runtime_pseudo_reloc_v2 *) start;
|
||||
runtime_pseudo_reloc_item_v2 *r;
|
||||
|
||||
/* A valid relocation list will contain at least one entry, and
|
||||
* one v1 data structure (the smallest one) requires two DWORDs.
|
||||
* So, if the relocation list is smaller than 8 bytes, bail.
|
||||
*/
|
||||
if (reloc_target < 8)
|
||||
return;
|
||||
|
||||
/* Check if this is the old pseudo relocation version. */
|
||||
/* There are two kinds of v1 relocation lists:
|
||||
* 1) With a (v2-style) version header. In this case, the
|
||||
* first entry in the list is a 3-DWORD structure, with
|
||||
* value:
|
||||
* { 0, 0, RP_VERSION_V1 }
|
||||
* In this case, we skip to the next entry in the list,
|
||||
* knowing that all elements after the head item can
|
||||
* be cast to runtime_pseudo_reloc_item_v1.
|
||||
* 2) Without a (v2-style) version header. In this case, the
|
||||
* first element in the list IS an actual v1 relocation
|
||||
* record, which is two DWORDs. Because there will never
|
||||
* be a case where a v1 relocation record has both
|
||||
* addend == 0 and target == 0, this case will not be
|
||||
* confused with the prior one.
|
||||
* All current binutils, when generating a v1 relocation list,
|
||||
* use the second (e.g. original) form -- that is, without the
|
||||
* v2-style version header.
|
||||
*/
|
||||
if (reloc_target >= 12
|
||||
&& v2_hdr->magic1 == 0 && v2_hdr->magic2 == 0
|
||||
&& v2_hdr->version == RP_VERSION_V1)
|
||||
{
|
||||
/* We have a list header item indicating that the rest
|
||||
* of the list contains v1 entries. Move the pointer to
|
||||
* the first true v1 relocation record. By definition,
|
||||
* that v1 element will not have both addend == 0 and
|
||||
* target == 0 (and thus, when interpreted as a
|
||||
* runtime_pseudo_reloc_v2, it will not have both
|
||||
* magic1 == 0 and magic2 == 0).
|
||||
*/
|
||||
v2_hdr++;
|
||||
}
|
||||
|
||||
if (v2_hdr->magic1 != 0 || v2_hdr->magic2 != 0)
|
||||
{
|
||||
/*************************
|
||||
* Handle v1 relocations *
|
||||
*************************/
|
||||
runtime_pseudo_reloc_item_v1 * o;
|
||||
for (o = (runtime_pseudo_reloc_item_v1 *) v2_hdr;
|
||||
o < (runtime_pseudo_reloc_item_v1 *)end;
|
||||
o++)
|
||||
{
|
||||
DWORD newval;
|
||||
reloc_target = (ptrdiff_t) base + o->target;
|
||||
newval = (*((DWORD*) reloc_target)) + o->addend;
|
||||
__write_memory ((void *) reloc_target, &newval, sizeof(DWORD));
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
/* If we got this far, then we have relocations of version 2 or newer */
|
||||
|
||||
/* Check if this is a known version. */
|
||||
if (v2_hdr->version != RP_VERSION_V2)
|
||||
{
|
||||
#if defined(__CYGWIN__)
|
||||
/* CYGWIN: Print error message and die, even when !DEBUGGING */
|
||||
__print_reloc_error (
|
||||
"error while loading shared libraries: invalid pseudo_reloc version %d.\n",
|
||||
(int) v2_hdr->version);
|
||||
cygwin_internal (CW_EXIT_PROCESS,
|
||||
STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION,
|
||||
1);
|
||||
#else
|
||||
# if defined(DEBUG)
|
||||
/* MINGW: Don't die; just return to caller. If DEBUG, print error message. */
|
||||
fprintf (stderr, "internal mingw runtime error:"
|
||||
"psuedo_reloc version %d is unknown to this runtime.\n",
|
||||
(int) v2_hdr->version);
|
||||
# endif
|
||||
#endif
|
||||
return;
|
||||
}
|
||||
|
||||
/*************************
|
||||
* Handle v2 relocations *
|
||||
*************************/
|
||||
|
||||
/* Walk over header. */
|
||||
r = (runtime_pseudo_reloc_item_v2 *) &v2_hdr[1];
|
||||
|
||||
for (; r < (runtime_pseudo_reloc_item_v2 *) end; r++)
|
||||
{
|
||||
/* location where new address will be written */
|
||||
reloc_target = (ptrdiff_t) base + r->target;
|
||||
|
||||
/* get sym pointer. It points either to the iat entry
|
||||
* of the referenced element, or to the stub function.
|
||||
*/
|
||||
addr_imp = (ptrdiff_t) base + r->sym;
|
||||
addr_imp = *((ptrdiff_t *) addr_imp);
|
||||
|
||||
/* read existing relocation value from image, casting to the
|
||||
* bitsize indicated by the 8 LSBs of flags. If the value is
|
||||
* negative, manually sign-extend to ptrdiff_t width. Raise an
|
||||
* error if the bitsize indicated by the 8 LSBs of flags is not
|
||||
* supported.
|
||||
*/
|
||||
switch ((r->flags & 0xff))
|
||||
{
|
||||
case 8:
|
||||
reldata = (ptrdiff_t) (*((unsigned char *)reloc_target));
|
||||
if ((reldata & 0x80) != 0)
|
||||
reldata |= ~((ptrdiff_t) 0xff);
|
||||
break;
|
||||
case 16:
|
||||
reldata = (ptrdiff_t) (*((unsigned short *)reloc_target));
|
||||
if ((reldata & 0x8000) != 0)
|
||||
reldata |= ~((ptrdiff_t) 0xffff);
|
||||
break;
|
||||
case 32:
|
||||
reldata = (ptrdiff_t) (*((unsigned int *)reloc_target));
|
||||
#ifdef _WIN64
|
||||
if ((reldata & 0x80000000) != 0)
|
||||
reldata |= ~((ptrdiff_t) 0xffffffff);
|
||||
#endif
|
||||
break;
|
||||
#ifdef _WIN64
|
||||
case 64:
|
||||
reldata = (ptrdiff_t) (*((unsigned long long *)reloc_target));
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
reldata=0;
|
||||
#if defined(__CYGWIN__)
|
||||
/* Print error message and die, even when !DEBUGGING */
|
||||
__print_reloc_error (
|
||||
"error while loading shared libraries: unknown pseudo_reloc bit size %d.\n",
|
||||
(int) (r->flags & 0xff));
|
||||
cygwin_internal (CW_EXIT_PROCESS,
|
||||
STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION,
|
||||
1);
|
||||
#else
|
||||
# ifdef DEBUG
|
||||
/* MINGW: If error, don't die; just print message if DEBUG */
|
||||
fprintf(stderr, "internal mingw runtime error: "
|
||||
"unknown pseudo_reloc bit size %d\n",
|
||||
(int) (r->flags & 0xff));
|
||||
# endif
|
||||
#endif
|
||||
break;
|
||||
}
|
||||
|
||||
/* Adjust the relocation value */
|
||||
reldata -= ((ptrdiff_t) base + r->sym);
|
||||
reldata += addr_imp;
|
||||
|
||||
/* Write the new relocation value back to *reloc_target */
|
||||
switch ((r->flags & 0xff))
|
||||
{
|
||||
case 8:
|
||||
__write_memory ((void *) reloc_target, &reldata, 1);
|
||||
break;
|
||||
case 16:
|
||||
__write_memory ((void *) reloc_target, &reldata, 2);
|
||||
break;
|
||||
case 32:
|
||||
__write_memory ((void *) reloc_target, &reldata, 4);
|
||||
break;
|
||||
#ifdef _WIN64
|
||||
case 64:
|
||||
__write_memory ((void *) reloc_target, &reldata, 8);
|
||||
break;
|
||||
#endif
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
_pei386_runtime_relocator ()
|
||||
{
|
||||
static NO_COPY int was_init = 0;
|
||||
if (was_init)
|
||||
return;
|
||||
++was_init;
|
||||
do_pseudo_reloc (&__RUNTIME_PSEUDO_RELOC_LIST__,
|
||||
&__RUNTIME_PSEUDO_RELOC_LIST_END__,
|
||||
&_image_base__);
|
||||
|
|
|
|||
|
|
@ -923,6 +923,8 @@ child_info::proc_retry (HANDLE h)
|
|||
break;
|
||||
case STATUS_DLL_NOT_FOUND:
|
||||
return exit_code;
|
||||
case STATUS_ILLEGAL_DLL_PSEUDO_RELOCATION: /* pseudo-reloc.c specific */
|
||||
return exit_code;
|
||||
case STATUS_CONTROL_C_EXIT:
|
||||
if (saw_ctrl_c ())
|
||||
return EXITCODE_OK;
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue