2014-08-01 18:10:23 +02:00
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# Upstream patch on top of v8.23 (to be removed in v8.24):
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# https://git.sv.gnu.org/cgit/coreutils.git/commit/?id=0cf7b1d9
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# Fixes a regression in chroot which did not chdir("/") in all cases.
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From 0c7abd9e8e1d1725ae600daa3ac9bbf8333f93c9 Mon Sep 17 00:00:00 2001
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From: Bernhard Voelker <mail@bernhard-voelker.de>
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Date: Fri, 1 Aug 2014 02:07:33 +0200
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Subject: [PATCH] chroot: perform chdir("/") again unless new --skip-chdir is
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specified
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Since commit v8.22-94-g99960ee, chroot(1) skips the chroot(2) syscall
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for "/" arguments (and synonyms). The problem is that it also skips
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the following chdir("/") call in that case. The latter breaks existing
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scripts which expect "/" to be the working directory inside the chroot.
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While the first part of the change - i.e., skipping chroot("/") - is
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okay for consistency with systems where it might succeed for a non-root
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user, the second part might be malicious, e.g.
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cd /home/user && chroot '/' bin/foo
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In the "best" case, chroot(1) could not execute 'bin/foo' with ENOENT,
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but in the worst case, chroot(1) would execute '/home/user/bin/foo' in
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the case that exists - instead of '/bin/foo'.
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Revert that second part of the patch, i.e., perform the chdir("/)
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in the common case again - unless the new --skip-chdir option is
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specified. Restrict this new option to the case of "/" arguments.
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* src/chroot.c (SKIP_CHDIR): Add enum.
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(long_opts): Add entry for the new --skip-chdir option.
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(usage): Add --skip-chdir option, and while at it, move the other
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to options into alphabetical order.
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(main): Accept the above new option, allowing it only in the case
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when NEWROOT is the old "/".
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Move down the chdir() call after the if-clause to ensure it is
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run in any case - unless --skip-chdir is specified.
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Add a 'newroot' variable for the new root directory as it is used
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in a couple of places now.
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* tests/misc/chroot-fail.sh: Invert the last tests which check the
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working directory of the execvp()ed program when a "/"-like
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argument was passed: now expect it to be "/" - unless --skip-chdir
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is given.
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* doc/coreutils.texi (chroot invocation): Document the new option.
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Document that chroot(1) usually calls chdir("/") unless the new
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--skip-chdir option is specified. Sort options.
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* NEWS (Changes in behavior): Mention the fix.
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(New features): Mention the new option.
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* init.cfg (nonroot_has_perm_): Add chroot's new --skip-chdir option.
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* tests/cp/preserve-gid.sh (t1): Likewise.
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* tests/cp/special-bits.sh: Likewise.
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* tests/id/setgid.sh: Likewise.
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* tests/misc/truncate-owned-by-other.sh: Likewise.
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* tests/mv/sticky-to-xpart.sh: Likewise.
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* tests/rm/fail-2eperm.sh: Likewise.
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* tests/rm/no-give-up.sh: Likewise.
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* tests/touch/now-owned-by-other.sh: Likewise.
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Reported by Andreas Schwab in http://bugs.gnu.org/18062
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---
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NEWS | 13 +++++++++++
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doc/coreutils.texi | 36 +++++++++++++++++++++-----------
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init.cfg | 3 +-
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src/chroot.c | 38 ++++++++++++++++++++++++++--------
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tests/cp/preserve-gid.sh | 3 +-
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tests/cp/special-bits.sh | 3 +-
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tests/id/setgid.sh | 8 +++----
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tests/misc/chroot-fail.sh | 23 +++++++++++++++++---
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tests/misc/truncate-owned-by-other.sh | 2 -
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tests/mv/sticky-to-xpart.sh | 5 ++--
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tests/rm/fail-2eperm.sh | 6 +++--
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tests/rm/no-give-up.sh | 2 -
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tests/touch/now-owned-by-other.sh | 2 -
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13 files changed, 106 insertions(+), 38 deletions(-)
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Index: NEWS
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===================================================================
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--- NEWS.orig
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+++ NEWS
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2015-01-20 00:25:06 +01:00
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@@ -180,6 +180,19 @@ GNU coreutils NEWS
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2014-08-01 18:10:23 +02:00
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--format=%T now reports the file system type, and tail -f now uses inotify,
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rather than the default of issuing a warning and reverting to polling.
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+** New features
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+
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+ chroot accepts the new --skip-chdir option to not change the working directory
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+ to "/" after changing into the chroot(2) jail, thus retaining the current wor-
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+ king directory. The new option is only permitted if the new root directory is
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+ the old "/", and therefore is useful with the --group and --userspec options.
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+
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+** Changes in behavior
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+
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+ chroot changes the current directory to "/" in again - unless the above new
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+ --skip-chdir option is specified.
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+ [bug introduced in coreutils-8.23]
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+
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* Noteworthy changes in release 8.22 (2013-12-13) [stable]
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Index: doc/coreutils.texi
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===================================================================
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--- doc/coreutils.texi.orig
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+++ doc/coreutils.texi
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2015-01-20 00:25:06 +01:00
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@@ -16074,7 +16074,10 @@ On many systems, only the super-user can
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2014-08-01 18:10:23 +02:00
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some systems (e.g., FreeBSD) can be configured to allow certain regular
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users to use the @code{chroot} system call, and hence to run this program.
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Also, on Cygwin, anyone can run the @command{chroot} command, because the
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-underlying function is non-privileged due to lack of support in MS-Windows.}
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+underlying function is non-privileged due to lack of support in MS-Windows.
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+Furthermore, the @command{chroot} command avoids the @code{chroot} system call
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+when @var{newroot} is identical to the old @file{/} directory for consistency
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+with systems where this is allowed for non-privileged users.}.
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Synopses:
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@example
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2015-01-20 00:25:06 +01:00
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@@ -16084,10 +16087,11 @@ chroot @var{option}
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2014-08-01 18:10:23 +02:00
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Ordinarily, file names are looked up starting at the root of the
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directory structure, i.e., @file{/}. @command{chroot} changes the root to
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-the directory @var{newroot} (which must exist) and then runs
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-@var{command} with optional @var{args}. If @var{command} is not
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-specified, the default is the value of the @env{SHELL} environment
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-variable or @command{/bin/sh} if not set, invoked with the @option{-i} option.
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+the directory @var{newroot} (which must exist), then changes the working
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+directory to @file{/}, and finally runs @var{command} with optional @var{args}.
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+If @var{command} is not specified, the default is the value of the @env{SHELL}
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+environment variable or @command{/bin/sh} if not set, invoked with the
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+@option{-i} option.
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@var{command} must not be a special built-in utility
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(@pxref{Special built-in utilities}).
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2015-01-20 00:25:06 +01:00
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@@ -16096,6 +16100,14 @@ Options must precede operands.
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2014-08-01 18:10:23 +02:00
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@table @samp
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+@item --groups=@var{groups}
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+@opindex --groups
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+Use this option to override the supplementary @var{groups} to be
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+used by the new process.
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+The items in the list (names or numeric IDs) must be separated by commas.
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+Use @samp{--groups=''} to disable the supplementary group look-up
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+implicit in the @option{--userspec} option.
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+
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@item --userspec=@var{user}[:@var{group}]
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@opindex --userspec
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By default, @var{command} is run with the same credentials
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2015-01-20 00:25:06 +01:00
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@@ -16106,13 +16118,13 @@ If a @var{user} is specified then the su
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2014-08-01 18:10:23 +02:00
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are set according to the system defined list for that user,
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unless overridden with the @option{--groups} option.
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-@item --groups=@var{groups}
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-@opindex --groups
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-Use this option to override the supplementary @var{groups} to be
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-used by the new process.
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-The items in the list (names or numeric IDs) must be separated by commas.
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-Use @samp{--groups=''} to disable the supplementary group look-up
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-implicit in the @option{--userspec} option.
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+@item --skip-chdir
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+@opindex --skip-chdir
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+Use this option to not change the working directory to @file{/} after changing
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+the root directory to @var{newroot}, i.e., inside the chroot.
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+This option is only permitted when @var{newroot} is the old @file{/} directory,
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+and therefore is mostly useful together with the @option{--groups} and
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+@option{--userspec} options to retain the previous working directory.
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@end table
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Index: init.cfg
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===================================================================
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--- init.cfg.orig
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+++ init.cfg
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@@ -400,7 +400,8 @@ nonroot_has_perm_()
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require_built_ chroot
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local rm_version=$(
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- chroot --user=$NON_ROOT_USERNAME / env PATH="$PATH" rm --version |
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+ chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
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+ rm --version |
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sed -n '1s/.* //p'
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)
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case ":$rm_version:" in
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Index: src/chroot.c
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===================================================================
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--- src/chroot.c.orig
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+++ src/chroot.c
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@@ -49,13 +49,15 @@ static inline bool gid_unset (gid_t gid)
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enum
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{
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GROUPS = UCHAR_MAX + 1,
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- USERSPEC
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+ USERSPEC,
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+ SKIP_CHDIR
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};
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static struct option const long_opts[] =
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{
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{"groups", required_argument, NULL, GROUPS},
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{"userspec", required_argument, NULL, USERSPEC},
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+ {"skip-chdir", no_argument, NULL, SKIP_CHDIR},
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{GETOPT_HELP_OPTION_DECL},
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{GETOPT_VERSION_OPTION_DECL},
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{NULL, 0, NULL, 0}
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@@ -194,9 +196,14 @@ Run COMMAND with root directory set to N
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"), stdout);
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fputs (_("\
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- --userspec=USER:GROUP specify user and group (ID or name) to use\n\
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--groups=G_LIST specify supplementary groups as g1,g2,..,gN\n\
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"), stdout);
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+ fputs (_("\
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+ --userspec=USER:GROUP specify user and group (ID or name) to use\n\
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+"), stdout);
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+ printf (_("\
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+ --skip-chdir do not change working directory to %s\n\
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+"), quote ("/"));
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fputs (HELP_OPTION_DESCRIPTION, stdout);
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fputs (VERSION_OPTION_DESCRIPTION, stdout);
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@@ -218,6 +225,7 @@ main (int argc, char **argv)
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char *userspec = NULL;
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char const *username = NULL;
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char const *groups = NULL;
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+ bool skip_chdir = false;
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/* Parsed user and group IDs. */
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uid_t uid = -1;
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@@ -254,6 +262,10 @@ main (int argc, char **argv)
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groups = optarg;
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break;
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+ case SKIP_CHDIR:
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+ skip_chdir = true;
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+ break;
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+
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case_GETOPT_HELP_CHAR;
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case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
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@@ -269,9 +281,19 @@ main (int argc, char **argv)
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usage (EXIT_CANCELED);
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}
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+ char const *newroot = argv[optind];
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+ bool is_oldroot = is_root (newroot);
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+
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+ if (! is_oldroot && skip_chdir)
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+ {
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+ error (0, 0, _("option --skip-chdir only permitted if NEWROOT is old %s"),
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+ quote ("/"));
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+ usage (EXIT_CANCELED);
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+ }
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+
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/* Only do chroot specific actions if actually changing root.
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The main difference here is that we don't change working dir. */
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- if (! is_root (argv[optind]))
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+ if (! is_oldroot)
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{
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/* We have to look up users and groups twice.
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- First, outside the chroot to load potentially necessary passwd/group
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@@ -307,14 +329,14 @@ main (int argc, char **argv)
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}
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#endif
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- if (chroot (argv[optind]) != 0)
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+ if (chroot (newroot) != 0)
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error (EXIT_CANCELED, errno, _("cannot change root directory to %s"),
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- argv[optind]);
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-
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- if (chdir ("/"))
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- error (EXIT_CANCELED, errno, _("cannot chdir to root directory"));
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+ newroot);
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}
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+ if (! skip_chdir && chdir ("/"))
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+ error (EXIT_CANCELED, errno, _("cannot chdir to root directory"));
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+
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if (argc == optind + 1)
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{
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/* No command. Run an interactive shell. */
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Index: tests/cp/preserve-gid.sh
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===================================================================
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--- tests/cp/preserve-gid.sh.orig
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+++ tests/cp/preserve-gid.sh
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@@ -117,7 +117,8 @@ t1() {
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u=$1; shift
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g=$1; shift
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t0 "$f" "$u" "$g" \
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- chroot --user=+$nameless_uid:+$nameless_gid1 \
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+ chroot --skip-chdir \
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+ --user=+$nameless_uid:+$nameless_gid1 \
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--groups="+$nameless_gid1,+$nameless_gid2" \
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/ env PATH="$tmp_path" "$@"
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}
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Index: tests/cp/special-bits.sh
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===================================================================
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--- tests/cp/special-bits.sh.orig
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+++ tests/cp/special-bits.sh
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@@ -42,7 +42,8 @@ set _ $(ls -l b); shift; p1=$1
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set _ $(ls -l b2); shift; p2=$1
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test $p1 = $p2 || fail=1
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-chroot --user=$NON_ROOT_USERNAME / env PATH="$PATH" cp -p c c2 || fail=1
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+chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" cp -p c c2 \
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+ || fail=1
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set _ $(ls -l c); shift; p1=$1
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set _ $(ls -l c2); shift; p2=$1
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test $p1 = $p2 && fail=1
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Index: tests/id/setgid.sh
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===================================================================
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--- tests/id/setgid.sh.orig
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+++ tests/id/setgid.sh
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@@ -27,14 +27,14 @@ echo $gp1 > exp || framework_failure_
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# With coreutils-8.16 and earlier, id -G would print both:
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# $gp1 $NON_ROOT_GID
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-chroot --user=$NON_ROOT_USERNAME:+$gp1 --groups='' / env PATH="$PATH" \
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- id -G > out || fail=1
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+chroot --skip-chdir --user=$NON_ROOT_USERNAME:+$gp1 --groups='' / \
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+ env PATH="$PATH" id -G > out || fail=1
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compare exp out || fail=1
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# With coreutils-8.22 and earlier, id would erroneously print
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# groups=$NON_ROOT_GID
|
|
|
|
-chroot --user=$NON_ROOT_USERNAME:+$gp1 --groups='' / env PATH="$PATH" \
|
|
|
|
- id > out || fail=1
|
|
|
|
+chroot --skip-chdir --user=$NON_ROOT_USERNAME:+$gp1 --groups='' / \
|
|
|
|
+ env PATH="$PATH" id > out || fail=1
|
|
|
|
grep -F "groups=$gp1" out || { cat out; fail=1; }
|
|
|
|
|
|
|
|
Exit $fail
|
|
|
|
Index: tests/misc/chroot-fail.sh
|
|
|
|
===================================================================
|
|
|
|
--- tests/misc/chroot-fail.sh.orig
|
|
|
|
+++ tests/misc/chroot-fail.sh
|
|
|
|
@@ -30,7 +30,7 @@ chroot --- / true # unknown option
|
|
|
|
test $? = 125 || fail=1
|
|
|
|
|
|
|
|
# Note chroot("/") succeeds for non-root users on some systems, but not all,
|
|
|
|
-# however we avoid the chroot() with "/" to have common behvavior.
|
|
|
|
+# however we avoid the chroot() with "/" to have common behavior.
|
|
|
|
chroot / sh -c 'exit 2' # exit status propagation
|
|
|
|
test $? = 2 || fail=1
|
|
|
|
chroot / . # invalid command
|
|
|
|
@@ -38,10 +38,25 @@ test $? = 126 || fail=1
|
|
|
|
chroot / no_such # no such command
|
|
|
|
test $? = 127 || fail=1
|
|
|
|
|
|
|
|
-# Ensure we don't chdir("/") when not changing root
|
|
|
|
-# to allow only changing user ids for a command.
|
|
|
|
-for dir in '/' '/.' '/../'; do
|
|
|
|
+# Ensure that --skip-chdir fails with a non-"/" argument.
|
|
|
|
+cat <<\EOF > exp || framework_failure_
|
|
|
|
+chroot: option --skip-chdir only permitted if NEWROOT is old '/'
|
|
|
|
+Try 'chroot --help' for more information.
|
|
|
|
+EOF
|
|
|
|
+chroot --skip-chdir . env pwd >out 2>err && fail=1
|
|
|
|
+compare /dev/null out || fail=1
|
|
|
|
+compare exp err || fail=1
|
|
|
|
+
|
|
|
|
+# Ensure we don't chroot("/") when NEWROOT is old "/".
|
|
|
|
+ln -s / isroot || framework_failure_
|
|
|
|
+for dir in '/' '/.' '/../' isroot; do
|
|
|
|
+ # Verify that chroot(1) succeeds and performs chdir("/")
|
|
|
|
+ # (chroot(1) of coreutils-8.23 failed to run the latter).
|
|
|
|
curdir=$(chroot "$dir" env pwd) || fail=1
|
|
|
|
+ test "$curdir" = '/' || fail=1
|
|
|
|
+
|
|
|
|
+ # Test the "--skip-chdir" option.
|
|
|
|
+ curdir=$(chroot --skip-chdir "$dir" env pwd) || fail=1
|
|
|
|
test "$curdir" = '/' && fail=1
|
|
|
|
done
|
|
|
|
|
|
|
|
Index: tests/misc/truncate-owned-by-other.sh
|
|
|
|
===================================================================
|
|
|
|
--- tests/misc/truncate-owned-by-other.sh.orig
|
|
|
|
+++ tests/misc/truncate-owned-by-other.sh
|
|
|
|
@@ -29,7 +29,7 @@ chmod g+w root-owned
|
|
|
|
# Ensure that the current directory is searchable by $NON_ROOT_USERNAME.
|
|
|
|
chmod g+x .
|
|
|
|
|
|
|
|
-chroot --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
|
|
|
|
+chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
|
|
|
|
truncate -s0 root-owned || fail=1
|
|
|
|
|
|
|
|
Exit $fail
|
|
|
|
Index: tests/mv/sticky-to-xpart.sh
|
|
|
|
===================================================================
|
|
|
|
--- tests/mv/sticky-to-xpart.sh.orig
|
|
|
|
+++ tests/mv/sticky-to-xpart.sh
|
|
|
|
@@ -42,7 +42,8 @@ chmod go+x . || framework_failure_
|
|
|
|
|
|
|
|
# Ensure that $NON_ROOT_USERNAME can access the required version of mv.
|
|
|
|
version=$(
|
|
|
|
- chroot --user=$NON_ROOT_USERNAME / env PATH="$PATH" mv --version |
|
|
|
|
+ chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
|
|
|
|
+ mv --version |
|
|
|
|
sed -n '1s/.* //p'
|
|
|
|
)
|
|
|
|
case $version in
|
|
|
|
@@ -50,7 +51,7 @@ case $version in
|
|
|
|
*) skip_ "cannot access just-built mv as user $NON_ROOT_USERNAME";;
|
|
|
|
esac
|
|
|
|
|
|
|
|
-chroot --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
|
|
|
|
+chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
|
|
|
|
mv t/root-owned "$other_partition_tmpdir" 2> out-t && fail=1
|
|
|
|
|
|
|
|
# On some systems, we get 'Not owner'. Convert it.
|
|
|
|
Index: tests/rm/fail-2eperm.sh
|
|
|
|
===================================================================
|
|
|
|
--- tests/rm/fail-2eperm.sh.orig
|
|
|
|
+++ tests/rm/fail-2eperm.sh
|
|
|
|
@@ -32,14 +32,16 @@ touch a/b || framework_failure_
|
|
|
|
# Try to ensure that $NON_ROOT_USERNAME can access
|
|
|
|
# the required version of rm.
|
|
|
|
rm_version=$(
|
|
|
|
- chroot --user=$NON_ROOT_USERNAME / env PATH="$PATH" rm --version |
|
|
|
|
+ chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
|
|
|
|
+ rm --version |
|
|
|
|
sed -n '1s/.* //p'
|
|
|
|
)
|
|
|
|
case $rm_version in
|
|
|
|
$PACKAGE_VERSION) ;;
|
|
|
|
*) skip_ "cannot access just-built rm as user $NON_ROOT_USERNAME";;
|
|
|
|
esac
|
|
|
|
-chroot --user=$NON_ROOT_USERNAME / env PATH="$PATH" rm -rf a 2> out-t && fail=1
|
|
|
|
+chroot --skip-chdir --user=$NON_ROOT_USERNAME / \
|
|
|
|
+ env PATH="$PATH" rm -rf a 2> out-t && fail=1
|
|
|
|
|
|
|
|
# On some systems, we get 'Not owner'. Convert it.
|
|
|
|
# On other systems (HPUX), we get 'Permission denied'. Convert it, too.
|
|
|
|
Index: tests/rm/no-give-up.sh
|
|
|
|
===================================================================
|
|
|
|
--- tests/rm/no-give-up.sh.orig
|
|
|
|
+++ tests/rm/no-give-up.sh
|
|
|
|
@@ -30,7 +30,7 @@ chmod go=x . || framework_failure_
|
|
|
|
|
|
|
|
|
|
|
|
# This must fail, since '.' is not writable by $NON_ROOT_USERNAME.
|
|
|
|
-chroot --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
|
|
|
|
+chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
|
|
|
|
rm -rf d 2>/dev/null && fail=1
|
|
|
|
|
|
|
|
# d must remain.
|
|
|
|
Index: tests/touch/now-owned-by-other.sh
|
|
|
|
===================================================================
|
|
|
|
--- tests/touch/now-owned-by-other.sh.orig
|
|
|
|
+++ tests/touch/now-owned-by-other.sh
|
|
|
|
@@ -28,7 +28,7 @@ chmod g+w root-owned
|
|
|
|
# Ensure that the current directory is searchable by $NON_ROOT_USERNAME.
|
|
|
|
chmod g+x .
|
|
|
|
|
|
|
|
-chroot --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
|
|
|
|
+chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
|
|
|
|
touch -d now root-owned || fail=1
|
|
|
|
|
|
|
|
Exit $fail
|