* PATCH: safe dereference sigmsg[] array
@ 2000-02-15 16:42 Bart Schaefer
0 siblings, 0 replies; only message in thread
From: Bart Schaefer @ 2000-02-15 16:42 UTC (permalink / raw)
To: zsh-workers
This came up in a discussion with someone at Sun. A new OS version may
introduce new signal numbers; if an old zsh binary is running on such an
OS, delivery of one of the new signals to a child process can cause zsh
to segfault printing the job description.
Similarly (and where it came up in practice) if zsh's signal.h-finding
configure code doesn't look in the right places, the sigmsg[] array will
be (nearly) empty and zsh segfaults on any child status change other than
simple exit.
The following causes signames2.awk to omit a macro wrapper for the array
references that uses "unknown signal" as the message for signals greater
than SIGCOUNT.
Index: Src/jobs.c
===================================================================
@@ -615,7 +615,7 @@
if (pn->status != SP_RUNNING) {
if (WIFSIGNALED(pn->status)) {
sig = WTERMSIG(pn->status);
- llen = strlen(sigmsg[sig]);
+ llen = strlen(sigmsg(sig));
if (WCOREDUMP(pn->status))
llen += 14;
if (llen > len)
@@ -626,8 +626,8 @@
doputnl = 1;
} else if (WIFSTOPPED(pn->status)) {
sig = WSTOPSIG(pn->status);
- if ((int)strlen(sigmsg[sig]) > len)
- len = strlen(sigmsg[sig]);
+ if ((int)strlen(sigmsg(sig)) > len)
+ len = strlen(sigmsg(sig));
if (job == thisjob && sig == SIGTSTP)
doputnl = 1;
} else if (isset(PRINTEXITVALUE) && isset(SHINSTDIN) &&
@@ -695,13 +695,13 @@
else
fprintf(fout, "done%*s", len - 4 + 2, "");
} else if (WIFSTOPPED(pn->status))
- fprintf(fout, "%-*s", len + 2, sigmsg[WSTOPSIG(pn->status)]);
+ fprintf(fout, "%-*s", len + 2, sigmsg(WSTOPSIG(pn->status)));
else if (WCOREDUMP(pn->status))
fprintf(fout, "%s (core dumped)%*s",
- sigmsg[WTERMSIG(pn->status)],
- (int)(len - 14 + 2 - strlen(sigmsg[WTERMSIG(pn->status)])), "");
+ sigmsg(WTERMSIG(pn->status)),
+ (int)(len - 14 + 2 - strlen(sigmsg(WTERMSIG(pn->status)))), "");
else
- fprintf(fout, "%-*s", len + 2, sigmsg[WTERMSIG(pn->status)]);
+ fprintf(fout, "%-*s", len + 2, sigmsg(WTERMSIG(pn->status)));
for (; pn != qn; pn = pn->next)
fprintf(fout, (pn->next) ? "%s | " : "%s", pn->text);
putc('\n', fout);
Index: Src/signames2.awk
===================================================================
@@ -63,7 +63,10 @@
printf "#include %czsh.mdh%c\n", 34, 34
printf "\n"
printf "/**/\n"
- printf "mod_export char *sigmsg[SIGCOUNT+2] = {\n"
+ printf "#define sigmsg(sig) ((sig) <= SIGCOUNT ? sig_msg[sig] : %c%s%c)", 34, "unknown signal", 34
+ printf "\n"
+ printf "/**/\n"
+ printf "mod_export char *sig_msg[SIGCOUNT+2] = {\n"
printf "\t%c%s%c,\n", 34, "done", 34
for (i = 1; i <= 0 + max; i++)
Index: Src/Modules/parameter.c
===================================================================
@@ -1230,12 +1230,12 @@
else
state = "done";
} else if (WIFSTOPPED(pn->status))
- state = sigmsg[WSTOPSIG(pn->status)];
+ state = sigmsg(WSTOPSIG(pn->status));
else if (WCOREDUMP(pn->status))
sprintf((state = buf2), "%s (core dumped)",
- sigmsg[WTERMSIG(pn->status)]);
+ sigmsg(WTERMSIG(pn->status)));
else
- state = sigmsg[WTERMSIG(pn->status)];
+ state = sigmsg(WTERMSIG(pn->status));
sprintf(buf, ":%d=%s", pn->pid, state);
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
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