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nvdisc.c: Fix crash after an error or signal in discipline function (#356)

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This patch fixes the crashes experienced when a discipline function
exited because of a signal or an error from a special builtin. The
crashes were caused by ksh entering an inconsistent state after
performing a longjmp away from the assign() and lookup() functions in
nvdisc.c. Fixing the crash requires entering a new context, then setting
a nonlocal goto with sigsetjmp(3). Any longjmps that happen while
running the discipline function will go back to assign/lookup, allowing
ksh to do a proper cleanup afterwards.

Resolves: https://github.com/ksh93/ksh/issues/346
This commit is contained in:
Johnothan King 2021-12-01 20:43:41 -08:00 • committed by Martijn Dekker
parent 520f530198
commit 0a343244c1
3 changed files with 21 additions and 5 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 "2021-11-29" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2021-12-01" /* 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. */