diff options
| author | Ron Yorston <rmy@pobox.com> | 2019-04-18 09:49:13 +0100 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2019-04-19 13:21:34 +0200 |
| commit | d1a2fa2a4e013960bf56dfef8a71ed2d08fc756b (patch) | |
| tree | 6d47b357fbc99a10fa026b969b8e53200b69681e /shell | |
| parent | 48645b83502a5add5429b6cbb19cf3a083f1adf4 (diff) | |
| download | busybox-d1a2fa2a4e013960bf56dfef8a71ed2d08fc756b.tar.gz | |
ash: catch error in arithmetic expansion in PS1
Setting PS1 to:
PS1='$((123+))'
causes the shell to enter an infinite error loop:
sh: arithmetic syntax error
Catch any exception raised by expandarg() in expandstr() and allow
processing to continue.
function old new delta
expandstr 262 344 +82
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 82/0) Total: 82 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
| -rw-r--r-- | shell/ash.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/shell/ash.c b/shell/ash.c index f3a2c6952..924e17f32 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -13043,6 +13043,9 @@ expandstr(const char *ps, int syntax_type) union node n; int saveprompt; struct parsefile *file_stop = g_parsefile; + volatile int saveint; + struct jmploc *volatile savehandler = exception_handler; + struct jmploc jmploc; /* XXX Fix (char *) cast. */ setinputstring((char *)ps); @@ -13054,18 +13057,13 @@ expandstr(const char *ps, int syntax_type) * Try a prompt with syntactically wrong command: * PS1='$(date "+%H:%M:%S) > ' */ - { - volatile int saveint; - struct jmploc *volatile savehandler = exception_handler; - struct jmploc jmploc; - SAVE_INT(saveint); - if (setjmp(jmploc.loc) == 0) { - exception_handler = &jmploc; - readtoken1(pgetc(), syntax_type, FAKEEOFMARK, 0); - } - exception_handler = savehandler; - RESTORE_INT(saveint); + SAVE_INT(saveint); + if (setjmp(jmploc.loc) == 0) { + exception_handler = &jmploc; + readtoken1(pgetc(), syntax_type, FAKEEOFMARK, 0); } + exception_handler = savehandler; + RESTORE_INT(saveint); doprompt = saveprompt; @@ -13077,7 +13075,17 @@ expandstr(const char *ps, int syntax_type) n.narg.text = wordtext; n.narg.backquote = backquotelist; - expandarg(&n, NULL, EXP_QUOTED); + /* expandarg() might fail too: + * PS1='$((123+))' + */ + SAVE_INT(saveint); + if (setjmp(jmploc.loc) == 0) { + exception_handler = &jmploc; + expandarg(&n, NULL, EXP_QUOTED); + } + exception_handler = savehandler; + RESTORE_INT(saveint); + return stackblock(); } |