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Fix KEYBD trap crash when inputting a command substitution (#355)

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This change fixes a crash that can occur after setting a KEYBD trap
then inputting a multi-line command substitution. The crash is
similar to issue #347, but it's easier to reproduce since it
doesn't require you to setup a kshrc file. Reproducer for the
crash:

  $ ENV=/./dev/null ksh
  $ trap : KEYBD
  $ : $(
  > true)
  Memory fault(coredump)

The bugfix was backported (with considerable changes) from ksh93v-
2013-10-08. The crash was first reported on the old mailing list:
https://www.mail-archive.com/ast-users@lists.research.att.com/msg00313.html

src/cmd/ksh93/{include/shlex.h,sh/lex.c}:
- To fix this properly, we need sizeof(Lex_t) to work as expected
  in edit.c, but that is thwarted by the _SHLEX_PRIVATE macro in
  lex.c which shlex.h uses to add private structs to the Lex_t type
  in lex.c only. So get rid of that _SHLEX_PRIVATE macro and make
  those members part of the centrally defined struct, renaming them
  to make it clear they're considered private to lex.c.

src/cmd/ksh93/edit/edit.c:
- Now that we can get its size, save and restore the shell lexing
  context when a KEYBD trap is present.

src/cmd/ksh93/tests/pty.sh:
- Add a regression test for the KEYBD trap crash.

Co-authored-by: Martijn Dekker <martijn@inlv.org>
This commit is contained in:
Johnothan King 2021-11-29 19:26:53 -08:00 • committed by Martijn Dekker
parent bfad44e56d
commit 370440473e
5 changed files with 70 additions and 52 deletions
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47
src/cmd/ksh93/include/shlex.h
View file

@ -32,7 +32,48 @@
#include "shtable.h"
#include "lexstates.h"
/*
* This structure allows for arbitrary depth nesting of (...), {...}, [...]
*/
struct _shlex_pvt_lexstate_
{
char incase; /* 1 for case pattern, 2 after case */
char intest; /* 1 inside [[ ... ]] */
char testop1; /* 1 when unary test op legal */
char testop2; /* 1 when binary test op legal */
char reservok; /* >0 for reserved word legal */
char skipword; /* next word can't be reserved */
char last_quote; /* last multi-line quote character */
char nestedbrace; /* ${var op {...}} */
};
struct _shlex_pvt_lexdata_
{
char nocopy;
char paren;
char dolparen;
char nest;
char docword;
char nested_tilde;
char *docend;
char noarg;
char warn;
char message;
char arith;
char *first;
int level;
int lastc;
int lex_max;
int *lex_match;
int lex_state;
int docextra;
#if SHOPT_KIA
off_t kiaoff;
#endif
};
/*
* Main lexer struct.
*/
typedef struct _shlex_
{
Shell_t *sh; /* pointer to the interpreter */
@ -62,9 +103,9 @@ typedef struct _shlex_
char *scriptname; /* name of script file */
Dt_t *entity_tree; /* for entity ids */
#endif /* SHOPT_KIA */
#ifdef _SHLEX_PRIVATE
_SHLEX_PRIVATE
#endif
/* The following two struct members are considered private to lex.c */
struct _shlex_pvt_lexdata_ lexd; \
struct _shlex_pvt_lexstate_ lex;
} Lex_t;
/* symbols for parsing */