[removed some CCs] On 1/18/21 4:37 PM, Michael Kerrisk (man-pages) wrote: > On 1/18/21 4:28 PM, Alejandro Colomar (man-pages) wrote: >> Hi Michael, >> >> Ping! >> >> And now I noticed a typo in the subject: >> s/hypen/hyphen/ > > D'oh! I missed that. > > In cases like these, where there's already two amendments to the patch, > perhaps better is a new complete patch, rather than a ping :-). Yup, I considered that for a moment... Should've listened to myself :/ BTW, I don't understand why you ffixed to use .RS/.RE. See https://lore.kernel.org/linux-man/eaee2c6e-cbb7-94b2-f6c4-9039d184e129@xxxxxxxxx/T/ Thanks, Alex > > Thanks, > > Michael > > >> On 1/8/21 3:28 PM, Alejandro Colomar (man-pages) wrote: >>> >>> >>> On 1/8/21 3:22 PM, Alejandro Colomar wrote: >>>> man-pages bug: 211029 >>>> https://bugzilla.kernel.org/show_bug.cgi?id=211029 >>>> >>>> Complete workaround >>> >>> Maybe a bit more readable: >>> Complete workaround example >>> >>> >>>> (it was too long for the page, but it may be useful here): >>>> >>>> ...... >>>> >>>> $ sudo ln -s -T /usr/bin/echo /usr/bin/-echo; >>>> $ cc -o system_hyphen -x c - ; >>>> #include <stdlib.h> >>>> >>>> int >>>> main(void) >>>> { >>>> system(" -echo Hello world!"); >>>> exit(EXIT_SUCCESS); >>>> } >>>> >>>> $ ./system_hyphen; >>>> Hello world! >>>> >>>> Reported-by: Ciprian Dorin Craciun <ciprian.craciun@xxxxxxxxx> >>>> Cc: Florian Weimer <fweimer@xxxxxxxxxx> >>>> Signed-off-by: Alejandro Colomar <alx.manpages@xxxxxxxxx> >>>> --- >>>> >>>> D'oh! >>>> >>>> man3/system.3 | 20 ++++++++++++++++++++ >>>> 1 file changed, 20 insertions(+) >>>> >>>> diff --git a/man3/system.3 b/man3/system.3 >>>> index 753d46f7d..ead35ab30 100644 >>>> --- a/man3/system.3 >>>> +++ b/man3/system.3 >>>> @@ -255,6 +255,26 @@ are not executed. >>>> Such risks are especially grave when using >>>> .BR system () >>>> from a privileged program. >>>> +.SH BUGS >>>> +.\" [BUG 211029](https://bugzilla.kernel.org/show_bug.cgi?id=211029) >>>> +.\" [Glibc bug](https://sourceware.org/bugzilla/show_bug.cgi?id=27143) >>>> +.\" [POSIX bug](https://www.austingroupbugs.net/view.php?id=1440) >>>> +If the command name starts with a hyphen, >>>> +.BR sh (1) >>>> +interprets the command name as an option, >>>> +and the behavior is undefined. >>>> +(See the >>>> +.B \-c >>>> +option to >>>> +.BR sh (1).) >>>> +To work around this problem, >>>> +prepend the command with a space as in the following call: >>>> +.PP >>>> +.RS 4 >>>> +.EX >>>> + system(" \-unfortunate\-command\-name"); >>>> +.EE >>>> +.RE >>>> .SH SEE ALSO >>>> .BR sh (1), >>>> .BR execve (2), >>>> >>> >> >> > > -- Alejandro Colomar Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/ http://www.alejandro-colomar.es/
