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Allow symlink creation on MS-Windows without Administrator privileges

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* src/w32.c (symlink): Use the
SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE flag when available.
(Bug#57386)
This commit is contained in:
Kien Nguyen 2022-08-24 23:19:35 +09:00 • committed by Eli Zaretskii
parent b28b2cefae
commit 34e0a232cd
1 changed files with 12 additions and 2 deletions
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14
src/w32.c
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@ -5992,12 +5992,22 @@ sys_umask (int mode)
#ifndef SYMBOLIC_LINK_FLAG_DIRECTORY
#define SYMBOLIC_LINK_FLAG_DIRECTORY 0x1
#endif
#ifndef SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE
#define SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE 0x2
#endif
int
symlink (char const *filename, char const *linkname)
{
char linkfn[MAX_UTF8_PATH], *tgtfn;
DWORD flags = 0;
/* The SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE flag is
supported from Windows 10 build 14972. It is only supported if
Developer Mode is enabled, and is ignored if it isn't. */
DWORD flags =
(os_subtype == OS_SUBTYPE_NT
&& (w32_major_version > 10
|| (w32_major_version == 10 && w32_build_number >= 14972)))
? SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE : 0;
int dir_access, filename_ends_in_slash;
/* Diagnostics follows Posix as much as possible. */
@ -6055,7 +6065,7 @@ symlink (char const *filename, char const *linkname)
directory. */
filename_ends_in_slash = IS_DIRECTORY_SEP (filename[strlen (filename) - 1]);
if (dir_access == 0 || filename_ends_in_slash)
flags = SYMBOLIC_LINK_FLAG_DIRECTORY;
flags |= SYMBOLIC_LINK_FLAG_DIRECTORY;
tgtfn = (char *)map_w32_filename (filename, NULL);
if (filename_ends_in_slash)