Package: fakechroot
Version: 2.9-1.2
Severity: normal
I think fakechroot is mistaken about how it wraps symlink(), because
it appears to not prepend the "oldpath" argument with the
FAKECHROOT_PATH if the FAKECHROOT_PATH is already present. I think it
should go ahead and prepend it if the oldpath is already absolute.
Consider the following sequence of code:
char buf[PATH_MAX];
char *p = "/srv/test/foo";
ssize_t sz;
if (0 == symlink(p, "x")) {
sz = readlink("x", buf, sizeof(buf) - 1);
if (sz != -1) {
buf[sz] = '\0';
return strcmp(p, buf);
}
}
I think i would expect the final strcmp to return 0 on any reasonable
POSIX-compliant operating system.
However, if this code happens to be run from within a fakechroot that
is on the path to p (or is p itself), the two strings will fail
comparisons.
That is, something like:
# make a test tree at /srv/test:
cd /srv/test
fakechroot /usr/sbin/chroot example
would make the above strcmp() return non-zero.
Consider:
0 wt...@pip:/srv/test$ fakechroot /usr/sbin/chroot /srv/test
r...@pip# ln -s /srv/test/foo bar
r...@pip# readlink bar
/foo
r...@pip# exit
0 wt...@pip:/srv/test$
I think the above readlink command should have returned /srv/test/foo.
--dkg
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing'), (200, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.6.32-5-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages fakechroot depends on:
ii libc6 2.10.2-6 Embedded GNU C Library: Shared lib
fakechroot recommends no packages.
fakechroot suggests no packages.
-- no debconf information
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