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server: Only check read/write-specific access bits for file sharing access checks.

This commit is contained in:
Alexandre Julliard 2011-07-01 18:33:33 +02:00
parent 46328eff5e
commit b00d60f125
1 changed files with 14 additions and 8 deletions
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22
server/fd.c
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@ -1476,6 +1476,11 @@ static void fd_destroy( struct object *obj )
static unsigned int check_sharing( struct fd *fd, unsigned int access, unsigned int sharing,
unsigned int open_flags, unsigned int options )
{
/* only a few access bits are meaningful wrt sharing */
const unsigned int read_access = FILE_READ_DATA | FILE_EXECUTE;
const unsigned int write_access = FILE_WRITE_DATA | FILE_APPEND_DATA;
const unsigned int all_access = read_access | write_access | DELETE;
unsigned int existing_sharing = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
unsigned int existing_access = 0;
struct list *ptr;
@ -1489,25 +1494,26 @@ static unsigned int check_sharing( struct fd *fd, unsigned int access, unsigned
if (fd_ptr != fd)
{
/* if access mode is 0, sharing mode is ignored */
if (fd_ptr->access) existing_sharing &= fd_ptr->sharing;
existing_access |= fd_ptr->access;
if (fd_ptr->access & all_access) existing_sharing &= fd_ptr->sharing;
existing_access |= fd_ptr->access;
}
}
if (((access & FILE_UNIX_READ_ACCESS) && !(existing_sharing & FILE_SHARE_READ)) ||
((access & FILE_UNIX_WRITE_ACCESS) && !(existing_sharing & FILE_SHARE_WRITE)) ||
if (((access & read_access) && !(existing_sharing & FILE_SHARE_READ)) ||
((access & write_access) && !(existing_sharing & FILE_SHARE_WRITE)) ||
((access & DELETE) && !(existing_sharing & FILE_SHARE_DELETE)))
return STATUS_SHARING_VIOLATION;
if (((existing_access & FILE_MAPPING_WRITE) && !(sharing & FILE_SHARE_WRITE)) ||
((existing_access & FILE_MAPPING_IMAGE) && (access & FILE_UNIX_WRITE_ACCESS)))
((existing_access & FILE_MAPPING_IMAGE) && (access & FILE_WRITE_DATA)))
return STATUS_SHARING_VIOLATION;
if ((existing_access & FILE_MAPPING_IMAGE) && (options & FILE_DELETE_ON_CLOSE))
return STATUS_CANNOT_DELETE;
if ((existing_access & FILE_MAPPING_ACCESS) && (open_flags & O_TRUNC))
return STATUS_USER_MAPPED_FILE;
if (!access) return 0; /* if access mode is 0, sharing mode is ignored (except for mappings) */
if (((existing_access & FILE_UNIX_READ_ACCESS) && !(sharing & FILE_SHARE_READ)) ||
((existing_access & FILE_UNIX_WRITE_ACCESS) && !(sharing & FILE_SHARE_WRITE)) ||
if (!(access & all_access))
return 0; /* if access mode is 0, sharing mode is ignored (except for mappings) */
if (((existing_access & read_access) && !(sharing & FILE_SHARE_READ)) ||
((existing_access & write_access) && !(sharing & FILE_SHARE_WRITE)) ||
((existing_access & DELETE) && !(sharing & FILE_SHARE_DELETE)))
return STATUS_SHARING_VIOLATION;
return 0;