ksh: bug with quoted parameter expansion

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I found a bug in ksh's parameter expansion on an edge case:

true $(true "${USER#'"'}")

/home/sh[4]: no closing quote

The problem seems to occurs when all of these conditions are present:

1. On ${var#pattern} or ${var%pattern} parameter expansion
2. When the pattern contains a singly quoted double quote: '"'
3. While expansion occurs withing $(...), (but not `...`)
4. While the expansion is quoted: "${var#pattern}".

true can be replaced by other commands or var=...
if '"' gets replaced by \", the issue disappear

The bin/ksh/lex.c seems to use a big switch+goto table with one label
per grammar context.  Maybe by jumping from context to context in a
specific pattern like above is producing the issue.

I did try to figure out where, but I lack time for now.

I hope the problem does not come from my way to test it and that it
have not been fixed.

$ uname -a  # also tested with /bin/ksh
OpenBSD t470s 6.2 GENERIC.MP#134 amd64

$ cvs co bin/ksh/; cd bin/ksh; make
[...]

$ ./ksh ~/sh
/home/sh[4]: no closing quote

Patch to fix kernel build without IPSEC

[mail+lists]

Hi guys,

 

Just a small one liner:

 

Index: sys/netinet/udp_usrreq.c

===

RCS file: /cvs/src/sys/netinet/udp_usrreq.c,v

retrieving revision 1.216

diff -u -p -r1.216 udp_usrreq.c

--- sys/netinet/udp_usrreq.c   22 Jul 2016 11:14:41 - 1.216

+++ sys/netinet/udp_usrreq.c   25 Nov 2016 04:43:21 -

@@ -181,9 +181,9 @@ udp_input(struct mbuf *m, ...)

   struct m_tag *mtag;

   struct tdb_ident *tdbi;

   struct tdb *tdb;

-   int error;

   u_int32_t ipsecflowinfo = 0;

#endif /* IPSEC */

+   int error;

va_start(ap, m);

   iphlen = va_arg(ap, int);

 

 

Thanks

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