This loses an insignificant optimization, but may allow backporting
of some recent-ish dash fixes.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit should have deleted these two statements:
commit c0e007663d
Author: Ron Yorston <rmy@pobox.com>
Date: Thu Oct 29 11:30:55 2015 +0000
ash: simplify EOF/newline handling in list parser
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Wed, 8 Sep 2010 20:07:26 +0800
[EXPAND] Fix ifsfirst/ifslastp leak
As it stands expandarg may return with a non-NULL ifslastp which
then confuses any subsequent ifsbreakup user that doesn't clear
it directly.
What's worse, if we get interrupted before we hit ifsfree in
expandarg we will leak memory.
This patch fixes this by always calling ifsfree in expandarg
thus ensuring that ifslastp is always NULL on the normal path.
It also adds an ifsfree call to the RESET path to ensure that
memory isn't leaked.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Fallout 1:
Date: Mon, 18 Oct 2010 10:55:42 +0800
[EXPAND] Fix ifsfirst/ifslastp leak in casematch
The commit f42e443bb511ed3224f09b4fcf0772438ebdbbfa
[EXPAND] Fix ifsfirst/ifslastp leak
revealed yet another ifsfirst/ifslastp leak in casematch.
Previously it was hidden because ifsfirst/ifslastp was cleared
unconditionally on entry (which caused the leakage of those
entries).
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Fallout 2:
Date: Sun, 28 Nov 2010 21:09:51 +0800
[EXPAND] Free IFS state in evalbackcmd
On Sun, Nov 07, 2010 at 04:04:20PM -0600, Jonathan Nieder wrote:
> Herbert Xu wrote:
> > commit f42e443bb511ed3224f09b4fcf0772438ebdbbfa
> > Author: Herbert Xu <herbert@gondor.apana.org.au>
> > Date: Wed Sep 8 20:07:26 2010 +0800
> >
> > [EXPAND] Fix ifsfirst/ifslastp leak
>
> Another puzzle bisecting to f42e443bb. This one comes from the
> grub-mkconfig script:
>
> $ sh -c 'datadir=/usr/share; pkgdatadir=${datadir}/`cat`' 2>&1 | cat -A
> cat: M-^\^M^F^HM-4^M^F^HM-(^M^F^H: No such file or directory$
> cat: M-(^M^F^H: No such file or directory$
>
> Still reproducible with 016b529. I'll try to find time to look into
> it, but thought you might like to know nevertheless.
This is the symptom of another leak. In this case evalbackcmd
occurs in the middle of an expansion (as it should) but the forked
child never clears the previous IFS state.
This patch adds the missing ifsfree call.
This wasn't as much of a problem as the previously discovered leaks
since all it means is that the child gets to carry around the parent's
expansion state and the child is usually short-lived.
Reported-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Fallout 3:
Date: Tue, 15 Mar 2011 16:01:34 +0800
[EXPAND] Free IFS state after here document expansion
Here's another bug bisecting to f42e443bb ([EXPAND] Fix
ifsfirst/ifslastp leak, 2010-09-08). It was found with the following
test case, based on the configure script for Tracker:
dash -x -c '
<<-_ACEOF
$@
_ACEOF
exec
' - abcdefgh
+
+ exec ?a
exec: 1: : Permission denied
The missing ifsfree call is in expandarg when it returns to openhere
during here document expansion.
Reported-by: Aurelien Jarno <aurel32@debian.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
function old new delta
ifsfree - 66 +66
ash_main 1490 1495 +5
argstr 1154 1159 +5
evalcase 275 270 -5
expandarg 972 888 -84
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/2 up/down: 76/-89) Total: -13 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit "[EVAL] Force fork if any trap is set, not just on EXIT"
had a similar code as our fix to that bug.
Eliminate some superficial differences.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
There was a bug in tryexec which bbox had fixed in 2003.
dash had a smaller fix in 2007. Copy it. It is smaller,
although it is also more quirky (requires argv[-1] to exist).
Upstream commit 1:
Date: Mon, 15 Oct 2007 20:24:28 +0800
[EXEC] Fixed execing of scripts with no hash-bang
The function tryexec used the original name instead of the path found through
PATH search. This patch fixes that.
Test case:
trap 'rm -f $TMP' EXIT
TMP=$(tempfile -s nosuchthing)
cat <<- EOF > $TMP
echo OK
EOF
chmod u+x $TMP
cd /
PATH=${TMP%/*} ${TMP##*/}
Old result:
/bin/sh: Can't open filelgY4Fanosuchthing
New result:
OK
Upstream commit 2:
Date: Sun, 23 Dec 2007 11:02:26 +0800
[EVAL] Fix bad pointer arithmetic in evalcommand
dash dies on sparc with a SIGBUS due to an arithmetic error introduced
with commit 03b4958, this patch fixes it.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
function old new delta
evalcommand 1261 1264 +3
dotcmd 321 319 -2
tryexec 115 64 -51
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 3/-53) Total: -50 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Mon, 31 Aug 2009 22:06:41 +1000
[CD] Lookup PWD after going through CDPATH
On Tue, Jul 14, 2009 at 09:39:03PM +0000, Eric Blake wrote:
> For the cd command, POSIX 2008 requires that after all pathnames in CDPATH
> have been tested and failed in step 5, then step 6 interprets the directory
> argument relative to PWD. In other words, this demonstrates a bug:
>
> $ dash -c 'cd /tmp; mkdir -p foo; CDPATH=oops; cd foo; echo $?; pwd'
> cd: 1: can't cd to foo
> 2
> /tmp
>
> while bash gets it correct:
>
> $ bash -c 'cd /tmp; mkdir -p foo; CDPATH=oops; cd foo; echo $?; pwd'
> 0
> /tmp/foo
This patch fixes the problem.
Reported-by: Eric Blake <ebb9@byu.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
function old new delta
cdcmd 667 680 +13
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream patch:
Date: Fri, 5 Oct 2007 23:26:45 +0800
[MEMALLOC] Made grabstackblock an inline wrapper for stalloc
The function grabstackblock is identical in semantics to stalloc within its
input constraints.
function old new delta
dotcmd 319 321 +2
grabstackblock 19 5 -14
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Sat, 6 Oct 2007 21:18:58 +0800
[VAR] Remove setvarsafe
The only user of setvarsafe is getopts. However, we can achieve the same
result by pre-setting the value of shellparam.optind.
function old new delta
getoptscmd 614 515 -99
setvarsafe 147 - -147
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-246) Total: -246 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Thu, 4 Oct 2007 22:20:38 +0800
[PARSER] Size optimisations in parameter expansion parser
Merge flags into subtype.
Do not write subtype out twice.
Add likely flag on ${ vs. $NAME.
Kill unnecessary (and bogus) PEOA check.
function old new delta
readtoken1 2891 2860 -31
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit 1:
Date: Wed, 26 Sep 2007 17:14:16 +0800
[PARSER] Recognise here-doc delimiters terminated by EOF
Previously dash required a <newline> character to be present in order for
a here-document delimiter to be detected. Allowing EOF in the absence of
a <newline> to play the same purpose allows some intuitive scripts to
succeed. POSIX seems to be silence on this so this should be OK.
Test case:
eval 'cat <<- NOT
test
NOT'
echo OK
Old result:
test
NOTOK
New result:
test
OK
Upstream commit 2:
Date: Sat, 20 Oct 2007 18:49:31 +0800
[PARSER] Fix here-doc corruption
The change
[PARSER] Recognise here-doc delimiters terminated by EOF
introduced a regerssion whereby lines starting with eofmark but are not equal
to eofmark would be corrupted. This patch fixes it.
Test case:
cat << _ACEOF
_ASBOX
_ACEOF
Old result:
SASBOX
New result:
_ASBOX
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Thu, 4 Oct 2007 22:15:10 +0800
[PARSER] Fix parsing of ${##1}
Previously dash treated ${##1} as a length operation. This patch fixes that.
Test case:
set -- a
echo ${##1}OK
Old result:
1OK
New result:
OK
This was a real bug in ash (but not in hush).
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Sun, 6 May 2007 19:28:56 +1000
[REDIR] Remove redundant CLOEXEC calls
Now that we're marking file descriptors as CLOEXEC in savefd, we no longer
need to close them on exec or in setinputfd.
function old new delta
ash_main 1478 1492 +14
setinputfile 224 226 +2
readtoken1 2752 2750 -2
shellexec 208 198 -10
clearredir 30 - -30
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 2/2 up/down: 16/-42) Total: -26 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Sat, 12 May 2007 18:00:57 +1000
[REDIR] Replace copyfd by savefd and use dup2 elsewhere
There are two kinds of users to copyfd, those that want to copy an fd to
an exact value and those that want to move an fd to a value >= 10. The
former can simply use dup2 directly while the latter share a lot of common
code that now constitutes savefd.
This does not change much, just reducing our divergence from dash code.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Sat, 6 Oct 2007 18:59:31 +0800
[BUILTIN] Treat OPTIND=0 in the same way as OPTIND=1
Previously setting OPTIND to 0 would cause subsequent getopts calls to fail.
This patch makes dash reset the getopts parameters the same way as OPTIND=1.
Both behaviours are allowed by POSIX but other common shells do tolerate this
case.
function old new delta
getoptsreset 24 30 +6
getoptscmd 632 614 -18
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstreams commit:
Date: Mon, 8 Oct 2007 21:32:25 +0800
[PARSER] Report substition errors at expansion time
On Wed, Apr 11, 2007 at 01:24:21PM -0700, Micah Cowan wrote:
> This operation fails on Ubuntu:
>
> $ /bin/sh -c 'if false; then d="${foo/bar}"; fi'
> /bin/sh: Syntax error: Bad substitution
>
> When used with other POSIX shells it succeeds. While semantically the
> variable reference ${foo/bar} is not valid, this is not a syntax error
> according to POSIX, and since the variable assignment expression is
> never invoked (because it's within an "if false") it should not be seen
> as an error.
>
> I ran into this because after restarting my system I could no longer log
> in. It turns out that the problem was (a) I had edited .gnomerc to
> source my .bashrc file so that my environment would be set properly, and
> (b) I had added some new code to my .bashrc WITHIN A CHECK FOR BASH!
> that used bash's ${var/match/sub} feature. Even though this code was
> within a "case $BASH_VERSION; in *[0-9]*) ... esac (so dash would never
> execute it since that variable is not set), it still caused dash to
> throw up.
>
> FYI, some relevant details from POSIX:
>
> Section 2.3, Token Recognition:
>
> 5. If the current character is an unquoted '$' or '`', the shell shall
> identify the start of any candidates for parameter expansion ( Parameter
> Expansion), command substitution ( Command Substitution), or arithmetic
> expansion ( Arithmetic Expansion) from their introductory unquoted
> character sequences: '$' or "${", "$(" or '`', and "$((", respectively.
> The shell shall read sufficient input to determine the end of the unit
> to be expanded (as explained in the cited sections).
>
> Section 2.6.2, Parameter Expansion:
>
> The format for parameter expansion is as follows:
>
> ${expression}
>
> where expression consists of all characters until the matching '}'. Any
> '}' escaped by a backslash or within a quoted string, and characters in
> embedded arithmetic expansions, command substitutions, and variable
> expansions, shall not be examined in determining the matching '}'.
> [...]
>
> The parameter name or symbol can be enclosed in braces, which are
> optional except for positional parameters with more than one digit or
> when parameter is followed by a character that could be interpreted as
> part of the name. The matching closing brace shall be determined by
> counting brace levels, skipping over enclosed quoted strings, and
> command substitutions.
> ---
> In addition to bash I've checked Solaris /bin/sh and ksh and they don't
> report an error.
>
> -----
> Micah Cowan:
>
> The applicable portion of POSIX is in XCU 2.10.1:
>
> "The WORD tokens shall have the word expansion rules applied to them
> immediately before the associated command is executed, not at the time
> the command is parsed."
>
> This seems fairly clear to me.
This patch moves the error detection to expansion time.
Test case:
if false; then
echo ${a!7}
fi
echo OK
Old result:
dash: Syntax error: Bad substitution
New result:
OK
function old new delta
evalvar 574 585 +11
readtoken1 2763 2750 -13
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Thu, 27 May 2010 14:21:17 +0800
[REDIR] Move null redirect checks into caller
The null redirect checks were added as an optimisation to avoid
unnecessary memory allocations. However, we could avoid this
completely by simply making the caller avoid making a redirection
unless it is not null.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
function old new delta
evaltree 784 809 +25
evalcommand 1251 1261 +10
hashvar 59 62 +3
dotcmd 321 319 -2
clearredir 37 30 -7
popredir 183 162 -21
redirect 1264 1233 -31
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/4 up/down: 63/-61) Total: -23 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream patch:
Date: Thu, 27 Dec 2007 13:57:07 +1100
[PARSER] Do not show prompts in expandstr
Once I fixed the previous problem it became apparent that we never dealt
with prompts with new-lines in them correctly. The problem is that we
showed a secondary prompt for each of them.
This patch disables prompt generation in expandstr.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
function old new delta
expandstr 102 127 +25
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Sun, 11 Nov 2007 15:00:06 +0800
[EXPAND] Removed herefd hack
The herefd hack goes back more than a decade. it limits the amount of
memory we have to allocate when expanding here-documents by writing the
result out from time to time. However, it's no longer safe because the
stack is used to place intermediate results too and there we certainly
don't want to write them out should we be short on memory.
In any case, with today's computers we can afford to keep the entire
result in memory and write them out at the end.
function old new delta
redirect 1268 1264 -4
ash_main 1485 1478 -7
subevalvar 1157 1132 -25
growstackstr 54 24 -30
argstr 1192 1154 -38
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/5 up/down: 0/-104) Total: -104 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
We need to flush at the very end in case we've generated any errors
before that. The flushall call cannot perform a longjmp so it's
safe there.
Date: Sat, 22 Sep 2007 20:50:21 +0800
[SHELL] Move flushall to the point just before _exit
We need to flush at the very end in case we've generated any errors
before that. The flushall call cannot perform a longjmp so it's
safe there.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream patch:
Date: Tue, 15 Mar 2011 15:44:47 +0800
[EVAL] Let funcnode refer to a function definition, not its first command
It is not unrelated: I changed the meaning of struct funcnode's field n
to refer to the function definition, rather than the list of the
function's commands, because I needed to refer to the function
definition node from evalfun, which only gets passed a funcnode. But it
is something that could be applied independently (without being useful
by itself), so I've attached it as a separate patch for easier review.
Signed-off-by: Harald van Dijk <harald@gigawatt.nl>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Sun, 6 May 2007 12:01:37 +1000
[REDIR] Remove EMFILE special case
No caller of copyfd need to ignore EMFILE so we can remove the special
case and just let it call sh_error on any error.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Tue, 6 Jul 2010 17:50:37 +0800
[PATCH 161/277] [EVAL] Check exit for eval NSUBSHELL
Example:
$ dash -c 'set -e; (false); echo here'
here
With this commit, dash exits 1 before echo.
The bug was reported by Stefan Fritsch through
http://bugs.debian.org/514863
Signed-off-by: Gerrit Pape <pape@smarden.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This was fixed differently in our tree:
Date: Fri Sep 16 19:04:02 2016 +0000
ash: exit after subshell error when errexit option is set
When "set -e" option is on, shell must exit when any command fails,
including compound commands of the form (compound-list) executed in a
subshell. Bash and dash shells have this behaviour.
Also add a corresponding testcase.
Signed-off-by: Rostislav Skudnov <rostislav@tuxera.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Wed, 8 Sep 2010 16:21:52 +0800
[JOBS] Debug compile fix
No point in tracing a no longer undeclared "ps->cmd", fixes:
jobs.c: In function \u2018commandtext\u2019:
jobs.c:1192: error: \u2018ps\u2019 undeclared (first use in this function)
jobs.c:1192: error: (Each undeclared identifier is reported only once
jobs.c:1192: error: for each function it appears in.)
Signed-off-by: maximilian attems <max@stro.at>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Sun, 28 Nov 2010 20:47:07 +0800
[BUILTIN] Stop documenting EXSHELLPROC
At some point between ash 0.3.5-11.0.1 and ash 0.3.8-37, Debian
ash stopped using the EXSHELLPROC exception to handle shell
scripts without a magic number.
Remove all remaining references to it to avoid confusion.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Sun, 28 Nov 2010 20:44:37 +0800
[BUILTIN] Use EXEXIT in place of EXEXEC
The intended semantics of EXEXEC are identical to EXEXIT, so
simplify by using EXEXIT directly.
Functional change: in edge cases (exec within a trap handler),
this causes the exit status from exec not to be clobbered.
For example, without this patch:
$ sh -c 'trap "exec nonexistent" EXIT'; echo $?
exec: 1: nonexistent: not found
0
And with it:
$ sh -c 'trap "exec nonexistent" EXIT'; echo $?
exec: 1: nonexistent: not found
127
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit 1 for ash:
[ERROR] Allow the originator of EXERROR to set the exit status
Some errors have exit status values specified by POSIX and it is
therefore desirable to be able to set the exit status at the EXERROR
source rather than in main.c.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Upstream commit 2 for ash:
[INPUT] Use exit status 127 when the script to run does not exist
This commit makes dash exit with return code 127 instead of 2 if
started as non-interactive shell with a non-existent command_file
specified as argument (or a directory), as documented in
http://www.opengroup.org/onlinepubs/009695399/utilities/sh.html#tag_04_128_14
The wrong exit code was reported by Clint Adams and Jari Aalto through
http://bugs.debian.org/548743http://bugs.debian.org/548687
Signed-off-by: Gerrit Pape <pape@smarden.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
NB: in fact, http://bugs.debian.org/548687 was not fixed by this:
"sh /dir/" thinks that EISDIR error on read is EOF, and exits 0.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
The commit 'ash: eval: Return status in eval functions' changed how
exit status is handled in eval functions. The case of nofork
applets was missed, resulting in the incorrect status potentially
being returned for nofork applets when FEATURE_SH_NOFORK is enabled.
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Previous commit probably introduced a bug:
non-matching size calculation in size counting and
actual copying caused by SHELL_ALIGN being applied differently!
This won't bite if string sizes are also SHELL_ALIGNed.
Thus fixing.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Allocation addresses of malloc() are jittery,
thought I had a mem leak in hush, but it was malloc variability.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
The construct such as this:
t=1
export t
t=new_value1
had a small probability of momentarily using free()d value.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
