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 :-). 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), >>> >> > > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/
