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Better handling of conflicting section information between 

SizeOfRawData and VirtualSize.
This commit is contained in:
Alexandre Julliard 2005-08-15 14:50:06 +00:00
parent 050b9ebf22
commit 4ebd2fc0ff
2 changed files with 54 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
dlls/ntdll/virtual.c
View File

@ -920,27 +920,36 @@ static NTSTATUS map_image( HANDLE hmapping, int fd, char *base, SIZE_T total_siz
for (i = pos = 0; i < nt->FileHeader.NumberOfSections; i++, sec++)
{
SIZE_T size;
SIZE_T map_size, file_size, end;
/* a few sanity checks */
size = sec->VirtualAddress + ROUND_SIZE( sec->VirtualAddress, sec->Misc.VirtualSize );
if (sec->VirtualAddress > total_size || size > total_size || size < sec->VirtualAddress)
if (!sec->Misc.VirtualSize)
{
ERR_(module)( "Section %.8s too large (%lx+%lx/%lx)\n",
sec->Name, sec->VirtualAddress, sec->Misc.VirtualSize, total_size );
goto error;
file_size = sec->SizeOfRawData;
map_size = ROUND_SIZE( 0, file_size );
}
else
{
map_size = ROUND_SIZE( 0, sec->Misc.VirtualSize );
file_size = min( sec->SizeOfRawData, map_size );
}
size = ROUND_SIZE( 0, sec->Misc.VirtualSize );
/* a few sanity checks */
end = sec->VirtualAddress + ROUND_SIZE( sec->VirtualAddress, map_size );
if (sec->VirtualAddress > total_size || end > total_size || end < sec->VirtualAddress)
{
ERR_(module)( "Section %.8s too large (%lx+%lx/%lx)\n",
sec->Name, sec->VirtualAddress, map_size, total_size );
goto error;
}
if ((sec->Characteristics & IMAGE_SCN_MEM_SHARED) &&
(sec->Characteristics & IMAGE_SCN_MEM_WRITE))
{
TRACE_(module)( "mapping shared section %.8s at %p off %lx (%x) size %lx (%lx) flags %lx\n",
sec->Name, ptr + sec->VirtualAddress,
sec->PointerToRawData, (int)pos, sec->SizeOfRawData,
size, sec->Characteristics );
if (map_file_into_view( view, shared_fd, sec->VirtualAddress, size, pos,
sec->Name, ptr + sec->VirtualAddress,
sec->PointerToRawData, (int)pos, file_size, map_size,
sec->Characteristics );
if (map_file_into_view( view, shared_fd, sec->VirtualAddress, map_size, pos,
VPROT_COMMITTED | VPROT_READ | PROT_WRITE,
FALSE ) != STATUS_SUCCESS)
{
@ -950,33 +959,32 @@ static NTSTATUS map_image( HANDLE hmapping, int fd, char *base, SIZE_T total_siz
/* check if the import directory falls inside this section */
if (imports && imports->VirtualAddress >= sec->VirtualAddress &&
imports->VirtualAddress < sec->VirtualAddress + size)
imports->VirtualAddress < sec->VirtualAddress + map_size)
{
UINT_PTR base = imports->VirtualAddress & ~page_mask;
UINT_PTR end = base + ROUND_SIZE( imports->VirtualAddress, imports->Size );
if (end > sec->VirtualAddress + size) end = sec->VirtualAddress + size;
if (end > sec->VirtualAddress + map_size) end = sec->VirtualAddress + map_size;
if (end > base)
map_file_into_view( view, shared_fd, base, end - base,
pos + (base - sec->VirtualAddress),
VPROT_COMMITTED | VPROT_READ | VPROT_WRITECOPY,
FALSE );
}
pos += size;
pos += map_size;
continue;
}
TRACE_(module)( "mapping section %.8s at %p off %lx size %lx virt %lx flags %lx\n",
sec->Name, ptr + sec->VirtualAddress,
sec->PointerToRawData, sec->SizeOfRawData,
size, sec->Characteristics );
sec->Misc.VirtualSize, sec->Characteristics );
if (!sec->PointerToRawData || !sec->SizeOfRawData) continue;
if (sec->SizeOfRawData < size) size = sec->SizeOfRawData;
if (!sec->PointerToRawData || !file_size) continue;
/* Note: if the section is not aligned properly map_file_into_view will magically
* fall back to read(), so we don't need to check anything here.
*/
if (map_file_into_view( view, fd, sec->VirtualAddress, size, sec->PointerToRawData,
if (map_file_into_view( view, fd, sec->VirtualAddress, file_size, sec->PointerToRawData,
VPROT_COMMITTED | VPROT_READ | VPROT_WRITECOPY,
removable ) != STATUS_SUCCESS)
{
@ -984,15 +992,14 @@ static NTSTATUS map_image( HANDLE hmapping, int fd, char *base, SIZE_T total_siz
goto error;
}
if ((sec->SizeOfRawData < sec->Misc.VirtualSize) && (sec->SizeOfRawData & page_mask))
if (file_size & page_mask)
{
DWORD end = ROUND_SIZE( 0, sec->SizeOfRawData );
if (end > sec->Misc.VirtualSize) end = sec->Misc.VirtualSize;
end = ROUND_SIZE( 0, file_size );
if (end > map_size) end = map_size;
TRACE_(module)("clearing %p - %p\n",
ptr + sec->VirtualAddress + sec->SizeOfRawData,
ptr + sec->VirtualAddress + file_size,
ptr + sec->VirtualAddress + end );
memset( ptr + sec->VirtualAddress + sec->SizeOfRawData, 0,
end - sec->SizeOfRawData );
memset( ptr + sec->VirtualAddress + file_size, 0, end - file_size );
}
}

30
server/mapping.c
View File

@ -116,11 +116,25 @@ static struct file *get_shared_file( struct mapping *mapping )
return NULL;
}
/* return the size of the memory mapping of a given section */
static inline unsigned int get_section_map_size( const IMAGE_SECTION_HEADER *sec )
{
if (!sec->Misc.VirtualSize) return ROUND_SIZE( sec->SizeOfRawData );
else return ROUND_SIZE( sec->Misc.VirtualSize );
}
/* return the size of the file mapping of a given section */
static inline unsigned int get_section_filemap_size( const IMAGE_SECTION_HEADER *sec )
{
if (!sec->Misc.VirtualSize) return sec->SizeOfRawData;
else return min( sec->SizeOfRawData, ROUND_SIZE( sec->Misc.VirtualSize ) );
}
/* allocate and fill the temp file for a shared PE image mapping */
static int build_shared_mapping( struct mapping *mapping, int fd,
IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
{
unsigned int i, max_size, total_size;
unsigned int i, size, max_size, total_size;
off_t shared_pos, read_pos, write_pos;
char *buffer = NULL;
int shared_fd;
@ -134,9 +148,9 @@ static int build_shared_mapping( struct mapping *mapping, int fd,
if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
{
unsigned int size = ROUND_SIZE( sec[i].Misc.VirtualSize );
size = get_section_filemap_size( &sec[i] );
if (size > max_size) max_size = size;
total_size += size;
total_size += get_section_map_size( &sec[i] );
}
}
if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
@ -159,10 +173,11 @@ static int build_shared_mapping( struct mapping *mapping, int fd,
if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
write_pos = shared_pos;
shared_pos += ROUND_SIZE( sec[i].Misc.VirtualSize );
if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
shared_pos += get_section_map_size( &sec[i] );
read_pos = sec[i].PointerToRawData;
toread = sec[i].SizeOfRawData;
size = get_section_filemap_size( &sec[i] );
if (!read_pos || !size) continue;
toread = size;
while (toread)
{
long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
@ -170,8 +185,7 @@ static int build_shared_mapping( struct mapping *mapping, int fd,
toread -= res;
read_pos += res;
}
if (pwrite( shared_fd, buffer, sec[i].SizeOfRawData, write_pos ) != sec[i].SizeOfRawData)
goto error;
if (pwrite( shared_fd, buffer, size, write_pos ) != size) goto error;
}
free( buffer );
return 1;