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Close Debian Bug #501566
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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POSIX.1-2008 §4.4 "File Access Permission" sayeth:
If execute permission is requested, access shall be granted
if execute permission is granted to at least one user by the
file permission bits or by an alternate access control
mechanism; otherwise, access shall be denied.
For historical reasons, POSIX unfortunately also allows access() and
faccessat() to return success for X_OK if the current process is
privileged, even when the above condition is not fulfilled and actual
execution would fail. On the affected platforms, "test -x <path>" as
root started returning true on nonexecutable files when dash switched
from its own emulation to the true faccessat in v0.5.7~54
(2010-04-02).
Work around this by checking the permissions bits when mode == X_OK
and geteuid() == 0 on such platforms.
Unfortunately the behavior seems to vary from one kernel version to
another, so we cannot just check the behavior at compile time and rely
on that. A survey of some affected kernels:
- NetBSD's kernel moved to the sane semantics in 1997
- OpenBSD's kernel made the same change in version 4.4, three years
ago
- FreeBSD 9's kernel fixes this but hasn't been released yet
It seems safe to only apply the workaround on systems using the
FreeBSD kernel for now, and to push for standardization on the
expected access()/faccessat() semantics so we can drop the workaround
altogether in a few years.
To try it on other platforms, use "./configure --enable-test-workaround".
Reported-by: Christoph Egger <christoph@debian.org>
Analysis-by: Petr Salinger <Petr.Salinger@seznam.cz>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently we only check special variable names that follow directly
after $ or ${. So errors such as ${#&} are not caught. This patch
fixes that by moving the is_special check to just before we print out
the special variable name.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch simplifies the EOF and new handling in the list parser.
In particular, it eliminates a case where we may leave here-documents
unfinished upon EOF.
It also removes special EOF/newline handling from parsecmd.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Doing a pungetc on an EOF is a noop and is only useful when we
don't know what character we're putting back. This patch removes
an unnecessary pungetc when we know it's EOF.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch adds a nextopt call in dotcmd in order to handle --.
Reported-by: Stephane Chazelas <stephane_chazelas@yahoo.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch removes the duplicate octal handling for %b by reusing
the existing code in conv_escape.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch replaces uses of warnx where we abort with error since
the effect is the same. The exit status however changes from 1 to
2. Non-fatal errors where we continue are unchanged.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch removes getintmax and moves its functionality into
getuintmax in order to reduce code duplication.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently we try to preserve the format string which is stored in
argv after temporarily modifying it. This is unnecessary as it's
only ever used once. This patch gets rid of it.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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MEM_OUT is only used by forkless backtick processing which we do
not currently support.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The branch in outmem where the string fits in the buffer is the
common case and is now marked as likely.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=379227
On Sat, Jul 22, 2006 at 12:48:38PM +0200, A Mennucc wrote:
> Package: dash
> Version: 0.5.3-3
> Severity: normal
>
> hi
>
> here are the examples
>
> $ bash -c 'echo -n -e "A\0102C\00D\0E" | hexdump -c'
> 0000000 A B C \0 D \0 E
> 0000007
>
> $ /bin/echo -n -e "A\0102C\00D\0E" | hexdump -c
> 0000000 A B C \0 D \0 E
> 0000007
>
> $ zsh -c 'echo -n -e "A\0102C\00D\0E" | hexdump -c'
> 0000000 A B C \0 D \0 E
> 0000007
>
> $ dash -c 'echo -n "A\0102C\00D\0E" | hexdump -c'
> 0000000 A B C
> 0000003
>
> and also
>
> $ dash -c 'echo -n "ABC\0DEFGH" | hexdump -c'
> 0000000 A B C
> 0000003
>
> As you see, dash 's builtin echo truncates the output at the first \0
>
> a.
>
> -- System Information:
> Debian Release: testing/unstable
> APT prefers unstable
> APT policy: (500, 'unstable'), (500, 'testing')
> Architecture: i386 (i686)
> Shell: /bin/sh linked to /bin/bash
> Kernel: Linux 2.6.16-1-k7
> Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8)
>
> Versions of packages dash depends on:
> ii libc6 2.3.6-15 GNU C Library: Shared libraries
>
> dash recommends no packages.
>
> -- debconf information:
> * dash/sh: false
>
> --
> Andrea Mennucc
> "E' un mondo difficile. Che vita intensa!" (Tonino Carotone)
This patch fixes handling of embedded NULs using an approach similar
to the one taken by NetBSD. In particular, we first determine the
length of the output string, and then use a sequence of Xs of the
same length as input to the underlying C printf to determine the
amount of leading and trailing padding. Finally we replace the
Xs with the actual string before writing it out.
In order to print out the temporary string containing Xs and padding,
a new helper xasprintf is added. Unlike asprintf though, our
xasprintf prints to the ash stack rather than using straight malloc
memory.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch adds the format string characters a, A and F to the
supported set of the built-in printf command. They're already
supported by the underlying printf function.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The Cygwin platform supports DOS style drive-letter paths such
as "C:\\dir", even though the preferred form is a POSIX-style
"/cygdrive/c/dir". This can be seen by doing things such as
chdir("c:") (which succeeds) followed by getcwd(NULL, 0) (which
returns the normalized "/cygdrive/c"). However, dash was trying
to perform local manipulations on the argument to 'cd' prior to
calling into libc, in order to update the state of $PWD and
friends; these manipulations were assuming that the user meant
to change to a relative subdirectory of the current location,
as in './c:', instead of honoring the drive letter. None of
the other dash builtins take a filename and manipulate it to
affect shell state (some, like 'test', take a file name, but as
stat("c:") works just fine, there is no need to normalize).
This patch has no impact outside of cygwin; on cygwin, it takes
advantage of a native function call to canonicalize any
incoming name into preferred form before updating shell state.
Pre-patch:
$ dash -c 'cd c: && echo $PWD'
dash: 1: cd: can't cd to c:
Post-patch:
$ dash -c 'cd c: && echo $PWD'
/cygdrive/c
Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch makes a small optimisation by using the same value for
quoted between evalvar and varvalue by eliminating nulonly and
passing along quoted instead.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently VSLENGTH and VSTRIM* are field-split even within quotes.
This is obviously wrong. This patch fixes that.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently we do not field-split $@/$* when it isn't quoted and IFS
is set but empty. This is obviously wrong. This patch fixes this.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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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>
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POSIX now requires that return without arguments in a trap should
return the last command status prior to executing traps. This
patch implements this behaviour.
Incidentally this also changes the behaviour of return without
arguments in a loop conditional to use the last exit status in
the body as opposed to the last command in the conditional when
there is one.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=332954
When return is used in a loop conditional the exit status will
be lost because we always set the exit status at the end of the
loop to that of the last command executed in the body.
This is counterintuitive and contrary to what most other shells do.
This patch fixes this by always preserving the exit status of
return when it is used in a loop conditional.
The patch was originally written by Gerrit Pape <pape@smarden.org>.
Reported-by: Stephane Chazelas <stephane_chazelas@yahoo.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The functions evalloop and evalfor share the logic on checking
and updating skipcount. This patch moves that into the helper
function skiploop.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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As it is if you do a multi-level break inside a function it'll
actually include loops outside of the function call. This is
counterintuitive.
This patch changes this by saving and resetting loopnest when
entering a function.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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POSIX now requires that exit without arguments in a trap should
return the last command status prior to executing traps. This
patch implements this behaviour.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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All originators of EXERROR have been setting the exitstatus for
a while now. So it is no longer appropriate to set it explicitly
in evalcommand.
In fact doing so may cause the original exitstatus to be lost.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Currently the exit status when we receive SIGINT is set in evalcommand
which means that it doesn't always get set. For example, if you press
CTRL-C at the prompt of an interactive dash, the exit status is not
set to 130 as it is in many other Bourne shells.
This patch fixes this by moving the setting of the exit status into
onint which also simplifies evalcommand.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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As it is if dotrap is called with evalskip set to a nonzero value,
it'll try to execute any set traps. The result is that the first
command in the first set trap will be executed while the rest of
the trap will be silently ignored due to evalskip. This is highly
counterintuitive, even though both bash and ksh exhibit a similar
behaviour.
This patch fixes it by skipping trap processing if evalskip is set
on entry. It also adds a dotrap call to the top of evaltree to
ensure that
while continue; do
continue;
done
has a chance of running traps.
Finally the pendingsigs check is moved into dotrap for compactness.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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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: Herbert Xu <herbert@gondor.apana.org.au>
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This patch adds the nlprompt/nlnoprompt helpers to isolate code
dealing with newlines and prompting.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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On Tue, Aug 26, 2014 at 12:34:42PM +0000, Eric Blake wrote:
> On 08/26/2014 06:15 AM, Oleg Bulatov wrote:
> > Hi!
> >
> > 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.
>
> > $ bash -c 'EDIT=xxx; echo $EDIT\
> > OR'
> > /usr/bin/vim
>
> Correct behavior.
>
> >
> > $ dash -c 'echo "$\
> > (pwd)"'
> > $(pwd)
> >
> > Is it undefined behaviour in POSIX?
>
> No, it's well-defined, and dash is buggy. POSIX says:
>
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_03
>
> "the shell shall break its input into tokens by applying the first
> applicable rule below to the next character in its input"
>
> Rule 4 covers backslash handling, while rule 5 covers locating the end
> of a word to be subject to $ expansion. Therefore, rule 4 should happen
> first. Rule 4 defers to the section on quoting, with the caveat that
> <newline> joining is the only substitution that happens immediately as
> part of the parsing:
>
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_02
>
> "If a <newline> follows the <backslash>, the shell shall interpret this
> as line continuation. The <backslash> and <newline> shall be removed
> before splitting the input into tokens. Since the escaped <newline> is
> removed entirely from the input and is not replaced by any white space,
> it cannot serve as a token separator."
>
> So the fact that dash is treating the elided backslash-newline as a
> token separator, and parsing your input as if ${EDIT}OR instead of
> ${EDITOR} is a bug in dash.
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>
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pgetc_macro is identical to pgetc except that it's a macro and
pgetc isn't. Since there is very little performance difference
on modern systems it's time to kill pgetc_macro.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch adds a special case in testcmd for the 4-argument
expression beginning with a !. Without this ! ! = ! is deemed
a syntax error, which breaks POSIX.
Note that this special case does not extend down into subexpressions
so if ! ! = ! is used inside parentheses then a syntax error will
still occur as before.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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When the manpage states
| <action> may be null, which cause the specified signals to be ignored.
it is not immediately obvious what it means for an action to be
null. Clarify by explicitly referring to an empty string, as
opposed to a NULL pointer or the string "null".
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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I saw a discussion in which there was some confusion over whether or not
you can use a symbolic name, since the manpage doesn't specifically say so.
Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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On Sun, Mar 09, 2014 at 11:11:43AM +0000, Jeroen van Dijke wrote:
>
> There seems to be a bug in the dash man page, at least in 0.5.7. It reads:
>
> Precision:
> An optional period, `.', followed by an optional digit string giving a precision which specifies the number of digits to appear after the decimal point, for e and f formats, or the maximum number of *characters* to be printed from a string (b and s for-
> mats); if the digit string is missing, the precision is treated as zero;
>
> dash behaves cuts to the number of bytes
>
> $ length=10; printf "%.${length}s\n" "eeeeeeeeeeeeeeeeeeeeeeeee"
> eeeeeeeeee
> $ length=10; printf "%.${length}s\n" "ëëëëëëëëëëëëëëëëëëëëëëëëë”
> ëëëëë
>
>
> The POSIX specification (2008) says:
>
> precision Gives the minimum number of digits to appear for the d, o, i, u, x, or X conversion specifiers (the field is padded with leading zeros), the number of digits to appear after the radix character for the e and f conversion specifiers, the maximum number of significant digits for the g conversion specifier; or the maximum number of *bytes* to be written from a string in the s conversion specifier. The precision shall take the form of a ( '.' ) followed by a decimal digit string; a null digit string is treated as zero.
>
> So it seems to me that “characters” should be changed to “bytes”.
Indeed and this patch makes that change.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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On 29/07/13 23:44, Luigi Tarenga wrote:
> hi list,
> while writing a script to execute parallel ssh command on many host I found
> a strange behavior of dash. I can replicate it with a very simple script but
> didn't find any documentation about dash or POSIX that can explain it.
>
> tested on centos 6.4 (dash 0.5.5.1) and wih dash compiled from source (0.5.7)
> the following script reports error:
>
> #!/bin/dash
>
> sleep 3 &
> sleep 3 &
> sleep 3 &
> sleep 3 &
>
> #/bin/true
> jobs -l
>
> wait %1
> wait %2
> wait %3
> wait %4
>
> [vortex@lizard ~]$ ./dash-0.5.7/src/dash test.sh
> [4] + 4569 Running
> [3] - 4568 Running
> [2] 4567 Running
> [1] 4566 Running
> prova: 14: wait: No such job: %4
> [vortex@lizard ~]$ echo $?
> 2
Yes, this looks like a bug to me. The number of allocated jobs is always
kept as a multiple of four, and the first check in considering whether
the job number is valid is "if it's greater than or equal to the number
of allocated job, it's invalid". That doesn't look right. That would
only be right if jobs were zero-based, but they aren't. If it's exactly
equal to the number of available jobs, it can still be valid. It works
when adding /bin/true, because four more more jobs end up allocated
internally.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Exclude /usr/local from command -p PATH.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch moves the pathval call into the describe_command
function and also eliminates an unnecessary branch when DEBUG
is off.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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On 10/07/13 20:18, Craig Loomis wrote:
> Dash (0.5.7 and git master) does not implement 'command -p'
> according to the standard, and opens an intriguing security hole to
> anyone trying this scheme.
>
> When using 'command -v' to simply print the path to an executable,
> '-p' has no effect:
You're right. dash has never supported combining -p with -v, but back in
2005 this was seemingly accidentally changed from reporting a syntax
error to silently ignoring the -p option, only about a month after dash
moved to git.
Making sure that -p is respected even when -v is used is easy enough,
see attached patch. Tested even with explicit PATH overrides:
PATH=/path/to/some/other/dash command -pv dash
correctly outputs /bin/dash on my system.
> the path that 'command -p cmd' uses is a compiled-in constant
> from dash's src/var.c:defpathvar, which starts with
> "/usr/local/sbin:/usr/local/bin". To me, that is both completely
> unexpected and pretty scary -- /usr/local/bin is (very) often less
> well secured or checked than, say, /bin:
Agreed. However, IMO, it does make sense for defpathvar to start with
/usr/local/*: it has two separate functions, it also serves as the
default path (hence the name) when dash is started with no PATH set at
all. I think fixing this should be done in a way so that command -p does
not use defpathvar, not by changing defpathvar. bash uses the same
confstr function for this that getconf uses, and it shouldn't be too
much work to make dash use that too. If no one else comes up with a
working patch or a better approach, I'll try to get that working.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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When nexpr gets an unexpected EOI, this may cause crashes further
up the call chain because we've advanced t_wp too far. Fix it by
checking for EOI in nexpr and only advancing t_wp if we've got more
arguments.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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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>
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Signed-off-by: Peter Rosin <peda@lysator.liu.se>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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with Aleksey we briefly discussed the mdoc compatibility of the manpage,
here's a patch that makes mandoc 1.12.1 happier and behaves correctly
against groff 1.21. I want to include it in the staging dash-0.5.7
OpenBSD port.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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On 12/03/2012 05:59 PM, Harald van Dijk wrote:
> On 12/03/2012 08:42 AM, Roy wrote:
>> MSYS libc does not support %j[dXx] format, only %ll[dXx] is supported.
>>
>> diff --git a/src/bltin/printf.c b/src/bltin/printf.c
>> index 893295c..12ce660 100644
>> --- a/src/bltin/printf.c
>> +++ b/src/bltin/printf.c
>> @@ -319,11 +319,12 @@ mklong(const char *str, const char *ch)
>> char *copy;
>> size_t len;
>>
>> - len = ch - str + 3;
>> + len = ch - str + 4;
>> STARTSTACKSTR(copy);
>> copy = makestrspace(len, copy);
>> - memcpy(copy, str, len - 3);
>> - copy[len - 3] = 'j';
>> + memcpy(copy, str, len - 4);
>> + copy[len - 4] = 'l';
>> + copy[len - 3] = 'l';
>> copy[len - 2] = *ch;
>> copy[len - 1] = '\0';
>> return (copy);
>
> The calling code uses the result to print intmax_t and uintmax_t values.
> Printing intmax_t values with %lld is wrong, this will only work if
> intmax_t is really a typedef for long long (which may be true on your
> system, but is not required by the standard).
>
> The other patch that Jonathan linked to should work just fine.
Here's a slightly tweaked version of that patch. Regardless of whether
PRIdMAX is defined as "jd" or as "lld", the use of memcpy here, first
copying "jd"/"lld" and the null byte, and only changing the 'd' after
that, surprisingly results in slightly shorter object code than the
original byte-by-byte approach, even though memcpy is fully inlined.
Perhaps that could be a reason for applying this, even if the original
reason for it, making the code work on not-quite-conforming systems,
isn't good enough to get it in dash.
Tested with normal glibc, and with glibc hacked to not provide PRIdMAX.
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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On Tue, Aug 28, 2012 at 01:27:24PM +0000, Todor Vlaev wrote:
>
> While playing around with parameter expansion I noticed that the
> following didn't work in dash (dash 0.5.5.1-7.4ubuntu1) as compared
> to bash even though I believe it should be POSIX-compliant:
>
> my_str=swan; last_char="${my_str#${my_str%?}}"; echo ${last_char}
>
> If the double quotes are removed, the last character is printed correctly.
>
> At a quick glance through the commits after the 0.5.5.1 release I saw
> the following bug fix. Could it be related?
>
> 0d7d66039b614b642c775432fd64aa8c11f9a64d
> [EXPAND] Fix quoted pattern patch breakage
We need to propagate EXP_QPAT in subevalvar as otherwise a nested
parameter expansion within subevalvar may be expanded incorrectly.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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