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Cygwin: path_conv: decouple pathconv_flags from path_types 

There's an unfortunate amalgamation of caller-provided pathconv_arg
flags with path_types flags which in turn are mostly mount flags.

This leads to a confusion of flag values in sylink_info::pflags and,
in turn, in path_conv::path_flags.

This patch decouples pathconv_flags from the other flags by making
sure that a pathconv_flag is never copied into a variable used for
path_types flags.  Also, remove PATH_NO_ACCESS_CHECK since it's
not necessary.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2019-01-06 14:29:53 +01:00
parent c90f4c0e27
commit fde4eaa105
2 changed files with 13 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
winsup/cygwin/path.cc
View File

@ -80,7 +80,8 @@ struct symlink_info
char contents[SYMLINK_MAX + 1]; char contents[SYMLINK_MAX + 1];
char *ext_here; char *ext_here;
int extn; int extn;
unsigned pflags; unsigned pflags; /* path flags, i.e. mount flags, special files, ... */
unsigned pc_flags; /* Relevant flags from caller of path_conv */
DWORD fileattr; DWORD fileattr;
int issymlink; int issymlink;
bool ext_tacked_on; bool ext_tacked_on;
@ -735,9 +736,10 @@ path_conv::check (const char *src, unsigned opt,
int symlen = 0; int symlen = 0;
for (unsigned pflags_or = opt & (PC_NO_ACCESS_CHECK | PC_KEEP_HANDLE); /* Make sure to check certain flags on last component only. */
for (unsigned pc_flags = opt & (PC_NO_ACCESS_CHECK | PC_KEEP_HANDLE);
; ;
pflags_or = 0) pc_flags = 0)
{ {
const suffix_info *suff; const suffix_info *suff;
char *full_path; char *full_path;
@ -764,7 +766,7 @@ path_conv::check (const char *src, unsigned opt,
if (error) if (error)
return; return;
sym.pflags |= pflags_or; sym.pc_flags = pc_flags;
if (!dev.exists ()) if (!dev.exists ())
{ {
@ -1190,7 +1192,7 @@ path_conv::check (const char *src, unsigned opt,
it will be figured out later by anything it will be figured out later by anything
which cares about this. */ which cares about this. */
} }
/* If the FS has been found to have unrelibale inodes, note /* If the FS has been found to have unreliable inodes, note
that in path_flags. */ that in path_flags. */
if (!fs.hasgood_inode ()) if (!fs.hasgood_inode ())
path_flags |= PATH_IHASH; path_flags |= PATH_IHASH;
@ -2721,7 +2723,8 @@ bool
symlink_info::set_error (int in_errno) symlink_info::set_error (int in_errno)
{ {
bool res; bool res;
if (!(pflags & PATH_NO_ACCESS_CHECK) || in_errno == ENAMETOOLONG || in_errno == EIO) if (!(pc_flags & PC_NO_ACCESS_CHECK)
|| in_errno == ENAMETOOLONG || in_errno == EIO)
{ {
error = in_errno; error = in_errno;
res = true; res = true;
@ -3103,7 +3106,7 @@ restart:
The handle has been opened with the FILE_OPEN_REPARSE_POINT The handle has been opened with the FILE_OPEN_REPARSE_POINT
flag, so it's a handle to the reparse point, not a handle flag, so it's a handle to the reparse point, not a handle
to the volumes root dir. */ to the volumes root dir. */
pflags &= ~PC_KEEP_HANDLE; pc_flags &= ~PC_KEEP_HANDLE;
/* Volume mount point: The filesystem information for the top /* Volume mount point: The filesystem information for the top
level directory should be for the volume top level directory, level directory should be for the volume top level directory,
rather than for the reparse point itself. So we fetch the rather than for the reparse point itself. So we fetch the
@ -3202,7 +3205,7 @@ restart:
if (h) if (h)
{ {
if (pflags & PC_KEEP_HANDLE) if (pc_flags & PC_KEEP_HANDLE)
conv_hdl.set (h); conv_hdl.set (h);
else else
NtClose (h); NtClose (h);

3
winsup/cygwin/path.h
View File

@ -39,6 +39,8 @@ struct suffix_info
extern suffix_info stat_suffixes[]; extern suffix_info stat_suffixes[];
/* DO NOT copy any of these files into the same set of flags as the
below path_types. Ever. */
enum pathconv_arg enum pathconv_arg
{ {
PC_SYM_FOLLOW = 0x0001, PC_SYM_FOLLOW = 0x0001,
@ -76,7 +78,6 @@ enum path_types
PATH_DOS = MOUNT_DOS, PATH_DOS = MOUNT_DOS,
PATH_IHASH = MOUNT_IHASH, PATH_IHASH = MOUNT_IHASH,
PATH_ALL_EXEC = (PATH_CYGWIN_EXEC | PATH_EXEC), PATH_ALL_EXEC = (PATH_CYGWIN_EXEC | PATH_EXEC),
PATH_NO_ACCESS_CHECK = PC_NO_ACCESS_CHECK,
PATH_CTTY = 0x00400000, /* could later be used as ctty */ PATH_CTTY = 0x00400000, /* could later be used as ctty */
PATH_OPEN = 0x00800000, /* use open semantics */ PATH_OPEN = 0x00800000, /* use open semantics */
/* FIXME? PATH_OPEN collides with /* FIXME? PATH_OPEN collides with