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Cygwin: mount: allow any valid character in UNC paths 

The current code only allows server and share names to
start with ASCII chars [a-zA-Z0-9],, which is not correct.
Rather, check for a valid share character.

Fixes: 1fd5e000ac ("import winsup-2000-02-17 snapshot")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2023-01-22 20:11:59 +01:00
parent bdb9f5b173
commit 6338d2f24a
2 changed files with 15 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
winsup/cygwin/mount.cc
View File

@ -42,11 +42,20 @@ bool NO_COPY mount_info::got_usr_bin;
bool NO_COPY mount_info::got_usr_lib; bool NO_COPY mount_info::got_usr_lib;
int NO_COPY mount_info::root_idx = -1; int NO_COPY mount_info::root_idx = -1;
/* is_unc_share: Return non-zero if PATH begins with //server/share /* is_native_path: Return non-zero if PATH starts with \??\[a-zA-Z] or
with \\?\[a-zA-Z] or with \\.\[a-zA-Z].
is_unc_share: Return non-zero if PATH begins with //server/share
or with one of the native prefixes //./ or //?/ or with one of the native prefixes //./ or //?/
This function is only used to test for valid input strings. This function is only used to test for valid input strings.
The later normalization drops the native prefixes. */ The later normalization drops the native prefixes. */
/* list of invalid chars in UNC filenames. These are a few more than
for "normal" filenames. */
const char _invalid_char[] = "\"/\\[]:|<>+=;,?*";
#define valid_share_char(_c) (strchr (_invalid_char, (_c)) == NULL)
static inline bool static inline bool
is_native_path (const char *path) is_native_path (const char *path)
{ {
@ -63,9 +72,9 @@ is_unc_share (const char *path)
const char *p; const char *p;
return (isdirsep (path[0]) return (isdirsep (path[0])
&& isdirsep (path[1]) && isdirsep (path[1])
&& isalnum (path[2]) && valid_share_char (path[2])
&& ((p = strpbrk (path + 3, "\\/")) != NULL) && ((p = strpbrk (path + 3, "\\/")) != NULL)
&& isalnum (p[1])); && valid_share_char (p[1]));
} }
/* Return true if src_path is a valid, internally supported device name. /* Return true if src_path is a valid, internally supported device name.

3
winsup/cygwin/release/3.4.6
View File

@ -3,3 +3,6 @@ Bug Fixes
Fix a problem that fsync returns EINVAL for block device. Fix a problem that fsync returns EINVAL for block device.
Addresses: https://cygwin.com/pipermail/cygwin/2023-January/252916.html Addresses: https://cygwin.com/pipermail/cygwin/2023-January/252916.html
Don't reject valid server and share names when mounting.
Addresses: https://cygwin.com/pipermail/cygwin/2023-January/252928.html