https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205871
Bug ID: 205871
Summary: install(1) in endless loop for orphaned symlinks
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: fr...@pinky.sax.de
install(1) with option "-d" creates directories. If the final target or an
intermediate directory is a symbolic link, that points to a none existing
file/directory, then install will enter an endless loop.
I believe the behaviour was introduced with
base r272026 | mjg | 2014-09-23 13:41:09 +0200 (Tue, 23 Sep 2014).
It was observed when using mergemaster for a jail setup with ezjail. In that
case symlinks visited from host can point to not existing directories on host
system.
environment:
FreeBSD 11.0-CURRENT #10 r292982M:
how to repeat:
% ln -s /notexists /tmp/
% install -d /tmp/notexists &
[1] 9843
% ps -v -p 9843
PID STAT TIME SL RE PAGEIN VSZ RSS LIM TSIZ %CPU %MEM COMMAND
9843 R 1:12.80 127 73 0 8356 2024 - 28 100.0 0.0 install -d
/tmp/notexists
% kill -ABRT 9843
% gdb /usr/bin/install install.core
(gdb) bt
#0 stat () at stat.S:3
#1 0x0000000000402e0b in main (argc=<value optimized out>, argv=<value
optimized out>) at /usr/src11/usr.bin/xinstall/xinstall.c:1269
(gdb) list 1269
1264 for (p = path;; ++p)
1265 if (!*p || (p != path && *p == '/')) {
1266 ch = *p;
1267 *p = '\0';
1268 again:
1269 if (stat(path, &sb) < 0) {
1270 if (errno != ENOENT)
1271 err(EX_OSERR, "stat %s", path);
1272 if (mkdir(path, 0755) < 0) {
1273 if (errno == EEXIST)
(gdb) q
The stat call returns ENOENT and mkdir returns with EEXIST - that creates an
endless loop.
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