The build failure on arm64 is tracked in bug 1644048 now. Moving this to
in progress again, until we figured out why it fails (or rather why it
does not fail on most platforms) and fixed it.
** Changed in: bash (Ubuntu Trusty)
Status: Fix Committed => In Progress
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https://bugs.launchpad.net/bugs/1422795
Title:
bash crashes often if inputrc contains revert-all-at-newline
Status in bash package in Ubuntu:
Fix Released
Status in bash source package in Trusty:
In Progress
Status in bash package in Debian:
Fix Released
Bug description:
Debian bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=747341
The Debian bug includes complete reproduction case. Basically:
with .inputrc containing
set revert-all-at-newline On
Go back in the commandline history, edit a command, then submit a different
command (may be empty)
Such as:
$ ls something
$ <UP><CTRL+W><DOWN><ENTER>
Attached diff is confirmed to fix the issue.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: bash 4.3-7ubuntu1.5 [origin: goobuntu-trusty-testing-desktop]
ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
Uname: Linux 3.13.0-44-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
CurrentDesktop: X-Cinnamon
Date: Tue Feb 17 15:49:30 2015
SourcePackage: bash
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.bash.bashrc: [modified]
mtime.conffile..etc.bash.bashrc: 2015-01-27T03:27:18.751405
[Test Case]
Adapted from the Debian bug report:
1. echo "set revert-all-at-newline on" > bug.inputrc
2. INPUTRC=bug.inputrc bash
3. echo hello
4. ^P^U^N^M [Hold down control and type "punm".]
Bash should die immediately with SIGABRT.
[Regression Potential]
Relatively low.
The change has no effect at all unless _rl_revert_all_lines() is called,
which only happens if revert-all-at-newline is set, and then only when a
newline is typed. So, the potential for regression is essentially zero for
non-interactive shells and for anyone not using revert-all-at-newline (which
is not the default).
Further, this change appeared upstream and in both Debian and Ubuntu over
a year ago, so it's had plenty of public testing.
lib/readline/misc.c:_rl_revert_all_lines() contains a loop which iterates
over history entries, reverting changes to each history entry. This patch
causes entry->data, which points to the per-entry undo list, to be cleared
before reverting edits rather than after. At first glance, this shouldn't
make any difference. However, it prevents rl_do_undo() from replacing the
history entry with one reflecting the change. Otherwise, the entry gets
freed, leaving _rl_revert_all_lines() with an invalid pointer.
_Not_ having an invalid pointer and double-free certainly can't be worse
than the current situation. Since we're avoiding is making the pointer
invalid rather than not doing the free, the chance of a new leak is pretty
much nonexistent.
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