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Reset lexer state on syntax error and on SIGINT (Ctrl+C)

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ksh crashed if you pressed Ctrl+C or Ctrl+D on a PS2 prompt while
you haven't finished entering a $(command substitution). It
corrupts subsequent command substitutions. Sometimes the situation
recovers, sometimes the shell crashes.

Simple crash reproducer:

  $ PS1="\$(echo foo) \$(echo bar) \$(echo baz) > "
  foo bar baz > echo $(                        <-- now press Ctrl+D
  > ksh: syntax error: `(' unmatched
  Memory fault

The same happens with Ctrl+C, minus the syntax error message.

The problem is that the lexer state becomes inconsistent when the
lexer is interrupted in the middle of reading a command
substitution of the form $( ... ). This is tracked in the
'lexd.dolparen' variable in the lexer state struct.

Resetting that variable is sufficient to fix this issue. However,
in this commit I prefer to just reinitialise the lexer state
completely to pre-empt any other possible issues. Whether there was
a syntax error or the user pressed Ctrl+C, we just interrupted all
lexing and parsing, so the lexer *should* restart from scratch.

src/cmd/ksh93/sh/fault.c: sh_fault():
- If the shell is in an interactive state (e.g. not a subshell) and
  SIGINT was received, reinitialise the lexer state. This fixes the
  crash with Ctrl+C.

src/cmd/ksh93/sh/lex.c: sh_syntax():
- When handling a syntax error, reset the lexer state. This fixes
  the crash with Ctrl+D.

NEWS:
- Also add the forgotten item for the previous fix (re: 2322f939).
This commit is contained in:
Martijn Dekker 2021-12-09 07:05:36 +01:00
parent 350e52877b
commit feedc05037
4 changed files with 16 additions and 1 deletions
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2
src/cmd/ksh93/include/version.h
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@ -21,7 +21,7 @@
#define SH_RELEASE_FORK "93u+m" /* only change if you develop a new ksh93 fork */
#define SH_RELEASE_SVER "1.0.0-beta.2" /* semantic version number: https://semver.org */
#define SH_RELEASE_DATE "2021-12-08" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2021-12-09" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_CPYR "(c) 2020-2021 Contributors to ksh " SH_RELEASE_FORK
/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */