| Commit message (Collapse) | Author | Age |
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Currently when shellexec fails on most errors the shell will exit
with exit status 2. This patch changes it to 126 in order to avoid
ambiguities with the exit status from a successful exec.
The errors that result in 127 has also been expanded to include
ENOTDIR, ENAMETOOLONG and ELOOP.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Hi,
On 26/05/17 09:04, Youfu Zhang wrote:
> $ PATH=/extra/path:/usr/sbin:/usr/bin:/sbin:/bin \
>> sh -xc 'command -V ls; command -V ls; command -Vp ls; command -vp ls'
> + command -V ls
> ls is /bin/ls
> + command -V ls
> ls is a tracked alias for /bin/ls
> + command -Vp ls
> ls is a tracked alias for (null)
> + command -vp ls
> Segmentation fault (core dumped)
>
> describe_command should respect `path' argument. Looking up in the hash table
> may gives incorrect index in entry.u.index and finally causes incorrect output
> or SIGSEGV.
True, but only when a path is passed in. If the default path is used,
looking up in the hash table is correct, and printing tracked aliases is
intentional.
If it's desirable to drop that feature, then it should be dropped
completely, code shouldn't be left in that can no longer be used. But
it's possible to keep it working: how about this instead?
Signed-off-by: Harald van Dijk <harald@gigawatt.nl>
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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This patch improves LINENO support by storing line numbers in the parse
tree, for commands as well as for function definitions. It makes LINENO
behaves properly when calling functions, and has the added benefit of
improved line numbers in error messages when the last-parsed command is
not the last-executed one. It removes the earlier LINENO support, and
instead sets LINENO from evaltree when a command is executed
Signed-off-by: Harald van Dijk <harald@gigawatt.nl>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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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>
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- Solaris lacks paths.h and the various _PATH_* #defines.
Check for them in configure.ac and fall back on the
usual suspects when they are missing.
- Older Solaris lacks isblank(), and versions that have it
use a macro. Check for the declaration in configure.ac
and fall back on a naive version when missing.
- Older Solaris does not support %jd (intmax_t) in format
strings, but it does support the PRIdMAX macro from inttypes.h.
Do a configure check for PRIdMAX and use it in the code.
If it doesn't exist, define it to "lld" when sizeof(long long)
equals sizeof(intmax_t) as this is more likely to work on
older systems. Otherwise, use "jd" and hope for the best.
- Older Solaris lacks stdint.h, but inttypes.h provides the
same types and works on all platforms I've tried dash on,
so just use it instead.
- Older Solaris doesn't like it when vsnprintf() is passed
a NULL buffer (in violation of the POSIX spec, of course).
Pass a 1-byte dummy buffer instead.
- Solaris lacks tempfile and mktemp programs. Fall back on a
"good-enough" custom function in mkbuiltins.
Signed-off-by: Brian Koropoff <bkoropoff@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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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>
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With klcc we get
klcc -DHAVE_CONFIG_H -I. -I.. -include ../config.h -DBSD=1 -DSHELL
-DIFS_BROKEN -Wall -D__CTYPE_NO_INLINE -MT exec.o -MD -MP -MF
.deps/exec.Tpo -c -o exec.o exec.c
exec.c: In function 'tryexec':
exec.c:160: warning: comparison with string literal results in unspecified behavior
Storing it in a local variable fixes the problem.
Thanks to Dan McGee for reporting this.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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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
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Now that we're marking file descriptors as CLOEXEC in savefd, we no longer
need to close them on exec or in setinputfd.
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On Sat, Oct 21, 2006 at 02:19:18PM +0000, Gerrit Pape wrote:
> Hi Herbert, please see
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=387458
>
> On Thu, Sep 14, 2006 at 03:50:02PM +0200, Julien Danjou wrote:
> > I just found this bug which is easily reproductible:
> >
> > % dash -c 'command -v'
> > zsh: segmentation fault dash -c 'command -v'
Since bash's behaviour is minimalist here, I've decided to adopt its
behaviour here as well which is to return success silently.
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Added impelmentation of bsearch since klibc doesn't have it yet.
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This gets rid of the only reference of sysexits.h in dash which is
from commandcmd. This is needed for klibc support since it doesn't
have sysexits.h.
The only uses of sysexits.h in commandcmd is superfluous anyway. In
fact, it is overly sensitive about usages such as 'command -vV ls'.
By making its behaviour close to that of bash/ksh, we end up saving
a bit of space too.
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This change updates the BSD licence to the three-clause version since
NetBSD has already done so. This makes dash GPL-compatible.
It also adds Christos Zoulas (NetBSD ash maintainer) to the COPYING file.
I've added "copyright by Herbert Xu" to most files.
Finally all CVS IDs and inclusion of sys/cdefs.h have been removed.
The latter is needed for support of klibc.
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