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2016-10-01ash: fix a thinko in the last commitDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-01ash: make internal globbing code selectable from configDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-01ash: explain how "command" is handled, and shrink it a bitDenys Vlasenko
function old new delta getoptscmd 641 632 -9 commandcmd 79 69 -10 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-19) Total: -19 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-30ash: [VAR] Initialise OPTIND after importing environmentDenys Vlasenko
Upstream commit 1: Date: Fri, 23 Aug 2013 21:27:42 +1000 [VAR] Initialise OPTIND after importing environment On Sat, Mar 23, 2013 at 01:46:20AM +0000, Chris F.A. Johnson wrote: > According to both the dash man page and the POSIX spec, "When the > shell is invoked, OPTIND is initialized to 1." > > However, it actually takes the value of the environment variable > if it exists: > > $ OPTIND=4 dash -c 'echo "$OPTIND"' > 4 > $ OPTIND=4 bash -c 'echo "$OPTIND"' > 1 > $ OPTIND=4 ksh -c 'echo "$OPTIND"' > 1 > $ OPTIND=4 ksh93 -c 'echo "$OPTIND"' > 1 This patch fixes this by initialising OPTIND after importing the environment. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Upstream commit 2: Date: Tue, 7 Oct 2014 22:24:42 +0800 [VAR] Use setvareq to set OPTIND initially There is no need to setvarint to set the initial value of OPTIND of one. This patch switchs to setvareq which also lets us avoid an unnecessary memory allocation. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-30ash: [BUILTIN] Merge SKIPFUNC/SKIPFILE and only clear SKIPFUNC when leaving ↵Denys Vlasenko
dotcmd Upstream commit: Date: Sat, 9 Jul 2011 22:05:22 +0800 [BUILTIN] Merge SKIPFUNC/SKIPFILE and only clear SKIPFUNC when leaving dotcmd Currently upon leaving a dotcmd the evalskip state is reset so if a continue/break statement is used within a dot script it would have no effect outside of the dot script. This is inconsistent with other shells. This patch is based on one by Jilles Tjoelker and only clears SKIPFUNC when leaving a dot script. As a result continue/break will remain in effect. It also merges SKIPFUNC/SKIPFILE as they have no practical difference. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-30ash: Avoid overflow for very long variable nameDenys Vlasenko
Upstream commit: Date: Tue, 3 Jul 2012 17:32:33 +0800 Avoid overflow for very long variable name Otherwise, this: $ perl -le 'print "v"x(2**31+1) ."=1"' | dash provokes integer overflow Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-30ash: [VAR] Sanitise environment variable names on entryDenys Vlasenko
Upstream commit: Date: Sat, 25 Feb 2012 15:35:18 +0800 [VAR] Sanitise environment variable names on entry On Tue, Feb 14, 2012 at 10:48:48AM +0000, harald@redhat.com wrote: > "export -p" prints all environment variables, without checking if the > environment variable is a valid dash variable name. > > IMHO, the only valid usecase for "export -p" is to eval the output. > > $ eval $(export -p); echo OK > OK > > Without this patch the following test does error out with: > > test.py: > import os > os.environ["test-test"]="test" > os.environ["test_test"]="test" > os.execv("./dash", [ './dash', '-c', 'eval $(export -p); echo OK' ]) > > $ python test.py > ./dash: 1: export: test-test: bad variable name > > Of course the results can be more evil, if the environment variable > name is crafted, that it injects valid shell code. This patch fixes the issue by sanitising all environment variable names upon entry into the shell. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-30ash: [EVAL] Avoid using undefined handlerDenys Vlasenko
Upstream commit: Date: Fri, 8 Jul 2011 16:41:24 +0800 [EVAL] Avoid using undefined handler * src/eval.c (evalbltin, evalfun): Set savehandler before calling setjmp with the possible "goto *done", where savehandler is used. Otherwise, clang warns that "Assigned value is garbage or undefined" at the point where "savehandler" is used on the RHS. Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-30ash: remove dead stores and unused variablesDenys Vlasenko
Upstream commit 1: Date: Fri, 8 Jul 2011 16:12:20 +0800 [MEMALLOC] Avoid gcc warning: variable 'oldstackp' set but not used * src/memalloc.c (growstackblock): Remove declaration and set of set-but-not-used variable. Also remove a stray space-before-TAB. Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Upstream commit 2: Date: Fri, 8 Jul 2011 16:16:11 +0800 [MEMALLOC] Avoid clang warning about dead store to "size" * src/memalloc.c (makestrspace): Remove dead store. Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-30ash: [MEMALLOC] Add pushstackmarkDenys Vlasenko
Upstream commit: Author: Herbert Xu <herbert@gondor.apana.org.au> Date: Sat Oct 6 00:45:52 2007 +0800 [MEMALLOC] Add pushstackmark This patch gets rid of the stack mark tracking hack by allocating a little bit of stack memory if we're at risk of planting a stack mark which may be grown later. To do this a new function pushstackmark is added which lets the user pick a bigger amount to allocate since some users do that anyway after setting a stack mark. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-29ash: fix arithmetic closing )) split by backslash-newlineDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-29ash: [PARSER] Handle backslash newlines properly after dollar signDenys Vlasenko
Fixes var_unbackslash1.tests failure. Upstream commit: [PARSER] Handle backslash newlines properly after dollar sign On Tue, Aug 26, 2014 at 12:34:42PM +0000, Eric Blake wrote: > On 08/26/2014 06:15 AM, Oleg Bulatov wrote: > > While playing with sh generators I found that dash and bash have different > > interpretations for <slash><newline> sequence. > > > > $ dash -c 'EDIT=xxx; echo $EDIT\ > >> OR' > > xxxOR > > Buggy. > > > > $ dash -c 'echo "$\ > > (pwd)"' > > $(pwd) > > > > Is it undefined behaviour in POSIX? > > No, it's well-defined, and dash is buggy. ... I agree. This patch should resolve this problem and similar ones affecting blackslash newlines after we encounter a dollar sign. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-29ash: input: Allow two consecutive calls to pungetcDenys Vlasenko
Upstream commit: input: Allow two consecutive calls to pungetc The commit ef91d3d6a4c39421fd3a391e02cd82f9f3aee4a8 ([PARSER] Handle backslash newlines properly after dollar sign) created cases where we make two consecutive calls to pungetc. As we don't explicitly support that there are corner cases where you end up with garbage input leading to undefined behaviour. This patch adds explicit support for two consecutive calls to pungetc. Reported-by: Jilles Tjoelker <jilles@stack.nl> Reported-by: Juergen Daubert <jue@jue.li> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> In bbox case, bashism >& may need two pungetc() too. function old new delta pgetc 514 555 +41 pushstring 114 144 +30 basepf 52 76 +24 popstring 134 151 +17 parse_command 1584 1585 +1 pungetc 12 9 -3 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 5/1 up/down: 113/-3) Total: 110 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-29ash: jobs: Don't attempt to access job table for job %0Denys Vlasenko
Upstream commit: jobs: Don't attempt to access job table for job %0 If job %0 is (mistakenly) specified, an out-of-bounds access to the jobtab occurs in function getjob() if num = 0: jp = jobtab + 0 - 1 Fix this by checking that the job number is larger than 0 before accessing the jobtab. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-29ash: [EVAL] Make eval with empty arguments return 0Denys Vlasenko
This is a backport of upstream commit: [EVAL] Make eval with empty arguments return 0 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-28ash: [EVAL] Fix use-after-free in dotrap/evalstringDenys Vlasenko
From upstream: [EVAL] Fix use-after-free in dotrap/evalstring The function dotrap calls evalstring using the stored trap string. If evalstring then unsets that exact trap string then we will end up using freed memory. This patch fixes it by making evalstring always duplicate the string before using it. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-28ash: Remove unused EV_BACKCMD flagDenys Vlasenko
The original ash defered forking commands in backquotes so builtins could be run in the same context as the shell. This behavior was controlled using the EV_BACKCMD to evaltree. Unfortunately, as Matthias Scheler noticed in 1999 (NetBSD PR/7814), the result was counterintuitive; for example, echo "`cd /`" would change the cwd. So ash 0.3.5 left out that optimization. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-28ash: eval: Return status in eval functionsDenys Vlasenko
Backported from dash: eval: Return status in eval functions The exit status is currently clobbered too early for case statements and loops. This patch fixes it by making the eval functions return the current exit status and setting them in one place -- evaltree. Harald van Dijk pointed out a number of bugs in the original patch. function old new delta evalcommand 1226 1242 +16 cmdloop 383 398 +15 evalfor 223 227 +4 evalcase 271 275 +4 localcmd 348 350 +2 evaltreenr 927 928 +1 evaltree 927 928 +1 evalsubshell 150 151 +1 evalpipe 356 357 +1 parse_command 1585 1584 -1 evalloop 177 164 -13 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 9/2 up/down: 45/-14) Total: 31 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-25ash: in heredoc code, fix access past the end of allocated memory. Closes 9276Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-25ash: fix handling of NULs in $'abc\000def\x00asd'. Closes 9286Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-21ash: use glob() from libcDenys Vlasenko
Adapted from dash. The "homegrown" glob code is retained (ifdef'ed out). This changes was inspired by bug 9261, which detected out-of bounds use of heap for 2098 byte long name in the "homegrown" code. This is still not fixed... function old new delta expandarg 960 982 +22 static.syntax_index_table 26 25 -1 static.spec_symbls 27 26 -1 static.metachars 4 - -4 addfname 42 - -42 msort 126 - -126 expmeta 528 - -528 ------------------------------------------------------------------------------ (add/remove: 0/4 grow/shrink: 1/2 up/down: 22/-702) Total: -680 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-20ash: fix handling of bashism $'xxx' with high-bit chars. Closes 9236Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-17ash: exit after subshell error when errexit option is setRostislav Skudnov
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>
2016-09-17fix "aloc" -> "alloc" typosDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-17ash: add a FIXME for bug 9246Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-09-01*: placate some compile warnings on OSXDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-07-25ash: fix handling of ${VAR: -2}Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-07-16ash: do not leave SIGQUIT ignored on "exec CMD"Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-04-22*: slap on a few ALIGN1/2s where appropriateDenys Vlasenko
The result of looking at "grep -F -B2 '*fill*' busybox_unstripped.map" text data bss dec hex filename 829901 4086 1904 835891 cc133 busybox_before 829665 4086 1904 835655 cc047 busybox Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-04-15ash: bash-compatible $'...' shouldn't expand in double quotesRon Yorston
Bash doesn't expand its $'...' construct in double quotes: $ echo "$'a\tb'" $'a\tb' Change BusyBox ash to do the same. This also fixes a problem with here documents where BusyBox ash gave an incorrect result for: $ cat <<EOF > '$' > EOF '$' Reported-by: Timo Teras <timo.teras@iki.fi> Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-04-15Rewrite iteration through applet names to save a few bytesRon Yorston
function old new delta run_applet_and_exit 758 755 -3 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-3) Total: -3 bytes In standalone shell mode the saving increases to 17 bytes. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-03-22ash: fix corruption of ${#var} if $var contains UTF-8 charactersRon Yorston
As reported in bug 8506: $ X=abcdÉfghÍjklmnÓpqrstÚvwcyz $ echo ${#X} abcd26 The result should be 26. This regression was introduced by: <d68d1fb> 2015-05-18 [Ron Yorston] ash: code shrink around varvalue The length in characters was being used to discard the contents of the variable instead of the length in bytes. URL: https://bugs.busybox.net/8506 Reported-by: Martijn Dekker <martijn@inlv.org> Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2016-02-01Fix compiling with musl's utmp stubsKylie McClain
This patch fixes compiling busybox with FEATURE_UTMP and _WTMP enabled. musl, while not really support utmp/wtmp, provides stub functions, as well as variables such as _PATH_UTMP, so that programs using utmp or wtmp can still compile fine. My reasoning for this patch is that on Exherbo, I'm currently trying to get us to be able to use the same busybox config file for both glibc and musl systems, using utmp/wtmp on systems that support it, and using the stubs on musl without needing two different configs. As of latest musl git, it provides all utmp functions needed; 1.1.12 doesn't, but I sent a patch to Rich to add the utmp{,x}name functions expected to exist, which was merged into musl upstream. Signed-off-by: Kylie McClain <somasissounds@gmail.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-01-02ash: suppress a compilation warningCristian Ionescu-Idbohrn
Reported by gcc (Debian 5.3.1-4) 5.3.1 20151219 shell/ash.c: In function 'evaltree': shell/ash.c:8432:19: warning: logical not is only applied to the left hand side of comparison Signed-off-by: Cristian Ionescu-Idbohrn <cristian.ionescu-idbohrn@axis.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-11-04ash: add support for bash 'function' keywordRon Yorston
Where the POSIX shell allows functions to be defined as: name () compound-command [ redirections ] bash adds the alternative syntax: function name [()] compound-command [ redirections ] Implement this in ash's bash compatibility mode. Most compound commands work (for/while/until/if/case/[[]]/{}); one exception is: function f (echo "no way!") The other two variants work: f() (echo "ok") function f() (echo "also ok") function old new delta parse_command 1555 1744 +189 tokname_array 232 240 +8 .rodata 155612 155566 -46 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/1 up/down: 197/-46) Total: 151 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-30ash: allow popredir to be called if the stack is emptyRon Yorston
If /tmp/test.sh is a script that tries to run a second script which happens to be non-executable this: command . /tmp/test.sh causes a seg fault. This is because clearredir is called in the error path to clear the stack of redirections. The normal path then calls popredir, but popredir fails when the stack is empty. Reported-by: Bastian Bittorf <bittorf@bluebottle.com> Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-30ash: fix EXEXEC status clobberingRon Yorston
evalcommand always clobbers the exit status in case of an EXEXEC which means that exec always fails with exit status 2 regardless of what it actually returns. This patch adds the missing check for EXEXEC so that the correct exit status is preserved. It causes the test ash-misc/exec.tests to succeed. Based on commit 7f68426 in dash git, by Herbert Xu. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29ash: simplify EOF/newline handling in list parserRon Yorston
Processing of here documents in ash has had a couple of breakages which are now the subject of tests. This commit should fix both. It is based on the following commit in dash git by Herbert Xu: <7c245aa> [PARSER] Simplify EOF/newline handling in list parser (See git://git.kernel.org/pub/scm/utils/dash/dash.git) Reported-by: Natanael Copa <ncopa@alpinelinux.org> Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29Revert "ash: fix a SEGV case in an invalid heredoc" xxxRon Yorston
This reverts commit 7e66102f762a7d80715f0c7e5925433256b78cee but leaves the test in place as it's still valid. Reported-by: Natanael Copa <ncopa@alpinelinux.org> Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29ash: fix error during recursive processing of here documentRon Yorston
Save the value of the checkkwd flag to prevent it being clobbered during recursion. Based on commit ec2c84d from git://git.kernel.org/pub/scm/utils/dash/dash.git by Herbert Xu. function old new delta readtoken 190 203 +13 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 13/0) Total: 13 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29ash: only allow local variables in functionsRon Yorston
Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29ash: respect -p flag when command builtin is run with -v/-VRon Yorston
The command builtin should only check the default path, not $PATH, when the -p flag is used along with -v/-V. Based on commits 65ae84b (by Harald van Dijk) and 29ee27d (by Herbert Xu) from git://git.kernel.org/pub/scm/utils/dash/dash.git). function old new delta commandcmd 72 87 +15 describe_command 437 450 +13 typecmd 84 86 +2 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/0 up/down: 30/0) Total: 30 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29ash: fix command -- crashDenys Vlasenko
busybox sh -c 'command --' segfaults because parse_command_args returns a pointer to a null pointer. Based on commit 18071c7 from git://git.kernel.org/pub/scm/utils/dash/dash.git by Gerrit Pape. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29ash: save a few bytes in code to parse case statementsRon Yorston
Based on commit 49b82fc from git://git.kernel.org/pub/scm/utils/dash/dash.git by Herbert Xu. function old new delta parse_command 1563 1555 -8 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-8) Total: -8 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29ash: allow newline after variable name in for loopRon Yorston
Newline is a valid delimiter between the variable name and `in` keyword in for loops. Based on commit 22e8fb4 from git://git.kernel.org/pub/scm/utils/dash/dash.git by Herbert Xu. function old new delta parse_command 1568 1563 -5 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-5) Total: -5 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-23tidy up strtok useDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-10ash: shrink umask codeDenys Vlasenko
function old new delta umaskcmd 258 248 -10 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-09ash: "you have mail" should ignore first change in mtimeDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-09ash: simplify "you have mail" codeDenys Vlasenko
function old new delta mailtime_hash - 4 +4 redirect 1282 1280 -2 mailtime 40 - -40 cmdloop 429 378 -51 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 0/2 up/down: 4/-93) Total: -89 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-09ash: make dowait() a bit more readable. Logic is unchangedDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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