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ksh/SOURCES/ksh-1.0.6-alarm-1.patch

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diff --git a/src/cmd/ksh93/Mamfile b/src/cmd/ksh93/Mamfile
index f6e6ac8..9d72d87 100644
--- a/src/cmd/ksh93/Mamfile
+++ b/src/cmd/ksh93/Mamfile
@@ -220,30 +220,18 @@ make install
done pmain.o generated
make libshell.a archive
prev shell.req
- make cd_pwd.o
- make bltins/cd_pwd.c
- make include/test.h implicit
- prev include/shtable.h implicit
- make include/defs.h implicit
- prev include/regress.h implicit dontcare
- prev include/shtable.h
- prev include/shell.h
- prev ${PACKAGE_ast_INCLUDE}/endian.h
- prev include/name.h
- prev include/argnod.h implicit
- prev ${PACKAGE_ast_INCLUDE}/cdt.h
- prev ${PACKAGE_ast_INCLUDE}/error.h
- prev ${PACKAGE_ast_INCLUDE}/sfio.h
+ make alarm.o
+ make bltins/alarm.c
+ make FEATURE/time implicit
+ prev features/time
+ exec - iffe ${IFFEFLAGS} -v -c "${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${LDFLAGS}" ref ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libdll} ${mam_libcmd} ${mam_libast} ${mam_libm} ${mam_libnsl} : run features/time
+ make ${PACKAGE_ast_INCLUDE}/times.h implicit
+ prev ${PACKAGE_ast_INCLUDE}/ast_time.h implicit
prev ${PACKAGE_ast_INCLUDE}/ast.h
- done include/defs.h
- done include/test.h
- make ${PACKAGE_ast_INCLUDE}/ls.h implicit
- prev ${PACKAGE_ast_INCLUDE}/ast_mode.h implicit dontcare
- prev ${PACKAGE_ast_INCLUDE}/ast_fs.h
- prev ${PACKAGE_ast_INCLUDE}/ast_std.h
- done ${PACKAGE_ast_INCLUDE}/ls.h
+ done ${PACKAGE_ast_INCLUDE}/times.h
+ done FEATURE/time generated
make include/builtins.h implicit
- prev include/shtable.h
+ prev include/shtable.h implicit
make FEATURE/dynamic implicit
prev features/dynamic
exec - iffe ${IFFEFLAGS} -v -c "${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${LDFLAGS}" ref ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libdll} ${mam_libcmd} ${mam_libast} ${mam_libm} ${mam_libnsl} : run features/dynamic
@@ -251,6 +239,36 @@ make install
done FEATURE/dynamic generated
prev ${PACKAGE_ast_INCLUDE}/option.h
done include/builtins.h
+ prev ${PACKAGE_ast_INCLUDE}/error.h
+ make include/defs.h implicit
+ prev include/regress.h implicit
+ prev include/shtable.h
+ prev include/shell.h
+ prev ${PACKAGE_ast_INCLUDE}/endian.h
+ prev include/name.h
+ prev include/argnod.h implicit
+ prev ${PACKAGE_ast_INCLUDE}/cdt.h
+ prev FEATURE/externs
+ prev ${PACKAGE_ast_INCLUDE}/error.h
+ prev ${PACKAGE_ast_INCLUDE}/sfio.h
+ prev ${PACKAGE_ast_INCLUDE}/ast.h
+ done include/defs.h
+ prev shopt.h
+ done bltins/alarm.c
+ exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} -I. -Iinclude -I${PACKAGE_ast_INCLUDE} -D_API_ast=20100309 -DERROR_CONTEXT_T=Error_context_t -c bltins/alarm.c
+ done alarm.o generated
+ make cd_pwd.o
+ make bltins/cd_pwd.c
+ make include/test.h implicit
+ prev include/shtable.h
+ prev include/defs.h
+ done include/test.h
+ make ${PACKAGE_ast_INCLUDE}/ls.h implicit
+ prev ${PACKAGE_ast_INCLUDE}/ast_mode.h implicit
+ prev ${PACKAGE_ast_INCLUDE}/ast_fs.h
+ prev ${PACKAGE_ast_INCLUDE}/ast_std.h
+ done ${PACKAGE_ast_INCLUDE}/ls.h
+ prev include/builtins.h
prev include/name.h
make include/path.h implicit
make FEATURE/acct implicit
@@ -341,14 +359,7 @@ make install
make misc.o
make bltins/misc.c
prev ${PACKAGE_ast_INCLUDE}/times.h
- make FEATURE/time implicit
- prev features/time
- exec - iffe ${IFFEFLAGS} -v -c "${CC} ${mam_cc_FLAGS} ${CCFLAGS} ${LDFLAGS}" ref ${mam_cc_L+-L.} ${mam_cc_L+-L${INSTALLROOT}/lib} -I${PACKAGE_ast_INCLUDE} -I${INSTALLROOT}/include ${mam_libdll} ${mam_libcmd} ${mam_libast} ${mam_libm} ${mam_libnsl} : run features/time
- make ${PACKAGE_ast_INCLUDE}/times.h implicit
- prev ${PACKAGE_ast_INCLUDE}/ast_time.h implicit dontcare
- prev ${PACKAGE_ast_INCLUDE}/ast.h
- done ${PACKAGE_ast_INCLUDE}/times.h dontcare
- done FEATURE/time generated
+ prev FEATURE/time
prev FEATURE/locale
make include/jobs.h implicit
prev ${PACKAGE_ast_INCLUDE}/vmalloc.h
@@ -1175,7 +1186,7 @@ make install
done edit/hexpand.c
exec - ${CC} ${mam_cc_FLAGS} ${CCFLAGS} -I. -Iinclude -I${PACKAGE_ast_INCLUDE} -D_API_ast=20100309 -DERROR_CONTEXT_T=Error_context_t -c edit/hexpand.c
done hexpand.o generated
- exec - ${AR} rc libshell.a cd_pwd.o cflow.o enum.o getopts.o hist.o misc.o mkservice.o print.o read.o sleep.o trap.o test.o typeset.o ulimit.o umask.o whence.o main.o nvdisc.o nvtype.o arith.o args.o array.o completion.o defs.o edit.o expand.o regress.o fault.o fcin.o
+ exec - ${AR} rc libshell.a alarm.o cd_pwd.o cflow.o enum.o getopts.o hist.o misc.o mkservice.o print.o read.o sleep.o trap.o test.o typeset.o ulimit.o umask.o whence.o main.o nvdisc.o nvtype.o arith.o args.o array.o completion.o defs.o edit.o expand.o regress.o fault.o fcin.o
exec - ${AR} rc libshell.a history.o init.o io.o jobs.o lex.o macro.o name.o nvtree.o parse.o path.o string.o streval.o subshell.o tdump.o timers.o trestore.o waitevent.o xec.o limits.o msg.o strdata.o testops.o keywords.o options.o signals.o aliases.o builtins.o variables.o lexstates.o emacs.o vi.o hexpand.o
exec - (ranlib libshell.a) >/dev/null 2>&1 || true
done libshell.a generated
diff --git a/src/cmd/ksh93/bltins/alarm.c b/src/cmd/ksh93/bltins/alarm.c
new file mode 100644
index 0000000..f31bed7
--- /dev/null
+++ b/src/cmd/ksh93/bltins/alarm.c
@@ -0,0 +1,277 @@
+/***********************************************************************
+* *
+* This software is part of the ast package *
+* Copyright (c) 1982-2012 AT&T Intellectual Property *
+* Copyright (c) 2020-2023 Contributors to ksh 93u+m *
+* and is licensed under the *
+* Eclipse Public License, Version 2.0 *
+* *
+* A copy of the License is available at *
+* https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html *
+* (with md5 checksum 84283fa8859daf213bdda5a9f8d1be1d) *
+* *
+* David Korn <dgk@research.att.com> *
+* Martijn Dekker <martijn@inlv.org> *
+* Johnothan King <johnothanking@protonmail.com> *
+* *
+***********************************************************************/
+/*
+ * alarm [-r] [varname [+]when]
+ *
+ * David Korn
+ * AT&T Labs
+ *
+ */
+
+/*
+ * TODO: 2014 email from David Korn cited at <https://bugzilla.redhat.com/1176670>:
+ *
+ * > I never documented the alarm builtin because it is problematic. The
+ * > problem is that traps can't safely be handled asynchronously. What should
+ * > happen is that the trap is marked for execution (sh.trapnote) and run after
+ * > the current command completes. The time trap should wake up the shell if
+ * > it is blocked and it should return and then handle the trap.
+ */
+
+#include "shopt.h"
+#include "defs.h"
+#include <error.h>
+#include "builtins.h"
+#include "FEATURE/time"
+
+#define R_FLAG 1
+#define L_FLAG 2
+
+struct tevent
+{
+ Namfun_t fun;
+ Namval_t *node;
+ Namval_t *action;
+ struct tevent *next;
+ long milli;
+ int flags;
+ void *timeout;
+};
+
+static const char ALARM[] = "alarm";
+
+static void trap_timeout(void*);
+
+/*
+ * insert timeout item on current given list in sorted order
+ */
+static void *time_add(struct tevent *item, void *list)
+{
+ struct tevent *tp = (struct tevent*)list;
+ if(!tp || item->milli < tp->milli)
+ {
+ item->next = tp;
+ list = item;
+ }
+ else
+ {
+ while(tp->next && item->milli > tp->next->milli)
+ tp = tp->next;
+ item->next = tp->next;
+ tp->next = item;
+ }
+ tp = item;
+ tp->timeout = sh_timeradd(tp->milli,tp->flags&R_FLAG,trap_timeout,tp);
+ return list;
+}
+
+/*
+ * delete timeout item from current given list, delete timer
+ */
+static void *time_delete(struct tevent *item, void *list)
+{
+ struct tevent *tp = (struct tevent*)list;
+ if(item==tp)
+ list = tp->next;
+ else
+ {
+ while(tp && tp->next != item)
+ tp = tp->next;
+ if(tp)
+ tp->next = item->next;
+ }
+ if(item->timeout)
+ sh_timerdel(item->timeout);
+ return list;
+}
+
+static void print_alarms(void *list)
+{
+ struct tevent *tp = (struct tevent*)list;
+ while(tp)
+ {
+ if(tp->timeout)
+ {
+ char *name = nv_name(tp->node);
+ if(tp->flags&R_FLAG)
+ {
+ double d = tp->milli;
+ sfprintf(sfstdout,e_alrm1,name,d/1000.);
+ }
+ else
+ sfprintf(sfstdout,e_alrm2,name,nv_getnum(tp->node));
+ }
+ tp = tp->next;
+ }
+}
+
+static void trap_timeout(void* handle)
+{
+ struct tevent *tp = (struct tevent*)handle;
+ sh.trapnote |= SH_SIGALRM;
+ if(!(tp->flags&R_FLAG))
+ tp->timeout = 0;
+ tp->flags |= L_FLAG;
+ sh.sigflag[SIGALRM] |= SH_SIGALRM;
+ if(sh_isstate(SH_TTYWAIT))
+ sh_timetraps();
+}
+
+void sh_timetraps(void)
+{
+ struct tevent *tp, *tpnext;
+ struct tevent *tptop;
+ while(1)
+ {
+ sh.sigflag[SIGALRM] &= ~SH_SIGALRM;
+ tptop= (struct tevent*)sh.st.timetrap;
+ for(tp=tptop;tp;tp=tpnext)
+ {
+ tpnext = tp->next;
+ if(tp->flags&L_FLAG)
+ {
+ tp->flags &= ~L_FLAG;
+ if(tp->action)
+ sh_fun(tp->action,tp->node,NULL);
+ tp->flags &= ~L_FLAG;
+ if(!tp->flags)
+ nv_unset(tp->node);
+ }
+ }
+ if(!(sh.sigflag[SIGALRM]&SH_SIGALRM))
+ break;
+ }
+}
+
+
+/*
+ * This trap function catches "alarm" actions only
+ */
+static char *setdisc(Namval_t *np, const char *event, Namval_t* action, Namfun_t *fp)
+{
+ struct tevent *tp = (struct tevent*)fp;
+ if(!event)
+ return action ? Empty : (char*)ALARM;
+ if(strcmp(event,ALARM)!=0)
+ {
+ /* try the next level */
+ return nv_setdisc(np, event, action, fp);
+ }
+ if(action==np)
+ action = tp->action;
+ else
+ tp->action = action;
+ return action ? (char*)action : Empty;
+}
+
+/*
+ * catch assignments and set alarm traps
+ */
+static void putval(Namval_t* np, const char* val, int flag, Namfun_t* fp)
+{
+ struct tevent *tp = (struct tevent*)fp;
+ double d;
+ if(val)
+ {
+ double now;
+#ifdef timeofday
+ struct timeval tmp;
+ timeofday(&tmp);
+ now = tmp.tv_sec + 1.e-6*tmp.tv_usec;
+#else
+ now = (double)time(NULL);
+#endif /* timeofday */
+ nv_putv(np,val,flag,fp);
+ d = nv_getnum(np);
+ if(*val=='+')
+ {
+ double x = d + now;
+ nv_putv(np,(char*)&x,NV_INTEGER|NV_DOUBLE,fp);
+ }
+ else
+ d -= now;
+ tp->milli = 1000*(d+.0005);
+ if(tp->timeout)
+ sh.st.timetrap = time_delete(tp,sh.st.timetrap);
+ if(tp->milli > 0)
+ sh.st.timetrap = time_add(tp,sh.st.timetrap);
+ }
+ else
+ {
+ tp = (struct tevent*)nv_stack(np, NULL);
+ sh.st.timetrap = time_delete(tp,sh.st.timetrap);
+ nv_unset(np);
+ free(fp);
+ }
+}
+
+static const Namdisc_t alarmdisc =
+{
+ sizeof(struct tevent),
+ putval,
+ 0,
+ 0,
+ setdisc,
+};
+
+int b_alarm(int argc,char *argv[],Shbltin_t *context)
+{
+ int n,rflag=0;
+ Namval_t *np;
+ struct tevent *tp;
+ while (n = optget(argv, sh_optalarm)) switch (n)
+ {
+ case 'r':
+ rflag = R_FLAG;
+ break;
+ case ':':
+ errormsg(SH_DICT,2, "%s", opt_info.arg);
+ break;
+ case '?':
+ errormsg(SH_DICT,ERROR_usage(2), "%s", opt_info.arg);
+ UNREACHABLE();
+ }
+ argc -= opt_info.index;
+ argv += opt_info.index;
+ if(error_info.errors)
+ {
+ errormsg(SH_DICT,ERROR_usage(2),optusage(NULL));
+ UNREACHABLE();
+ }
+ if(argc==0)
+ {
+ print_alarms(sh.st.timetrap);
+ return 0;
+ }
+ if(argc!=2)
+ {
+ errormsg(SH_DICT,ERROR_usage(2),optusage(NULL));
+ UNREACHABLE();
+ }
+ np = nv_open(argv[0],sh.var_tree,NV_NOARRAY|NV_VARNAME);
+ if(!nv_isnull(np))
+ nv_unset(np);
+ nv_setattr(np, NV_DOUBLE);
+ tp = sh_newof(NULL,struct tevent,1,0);
+ tp->fun.disc = &alarmdisc;
+ tp->flags = rflag;
+ tp->node = np;
+ nv_stack(np,(Namfun_t*)tp);
+ nv_putval(np, argv[1], 0);
+ return 0;
+}
diff --git a/src/cmd/ksh93/bltins/sleep.c b/src/cmd/ksh93/bltins/sleep.c
index b34e62d..3bb55b1 100644
--- a/src/cmd/ksh93/bltins/sleep.c
+++ b/src/cmd/ksh93/bltins/sleep.c
@@ -127,6 +127,8 @@ skip:
if(tloc < (now=time(NULL)))
break;
d = (double)(tloc-now);
+ if(sh.sigflag[SIGALRM]&SH_SIGTRAP)
+ sh_timetraps();
}
return 0;
}
diff --git a/src/cmd/ksh93/data/builtins.c b/src/cmd/ksh93/data/builtins.c
index 760b7ce..22ea156 100644
--- a/src/cmd/ksh93/data/builtins.c
+++ b/src/cmd/ksh93/data/builtins.c
@@ -116,6 +116,7 @@ const struct shtable3 shtab_builtins[] =
"pwd", NV_BLTIN|BLT_ENV, bltin(pwd),
"read", NV_BLTIN|BLT_ENV, bltin(read),
"sleep", NV_BLTIN, bltin(sleep),
+ "alarm", NV_BLTIN|BLT_ENV, bltin(alarm),
"times", NV_BLTIN|BLT_ENV|BLT_SPC, bltin(times),
"ulimit", NV_BLTIN|BLT_ENV, bltin(ulimit),
"umask", NV_BLTIN|BLT_ENV, bltin(umask),
@@ -2170,6 +2171,8 @@ const char sh_optwhence[] =
;
+const char e_alrm1[] = "alarm -r %s +%.3g\n";
+const char e_alrm2[] = "alarm %s %.3f\n";
const char e_baddisc[] = "%s: invalid discipline function";
const char e_nofork[] = "cannot fork";
const char e_nosignal[] = "%s: unknown signal name";
diff --git a/src/cmd/ksh93/include/builtins.h b/src/cmd/ksh93/include/builtins.h
index 34c697c..f6b3f59 100644
--- a/src/cmd/ksh93/include/builtins.h
+++ b/src/cmd/ksh93/include/builtins.h
@@ -115,6 +115,8 @@ extern int b_times(int, char*[],Shbltin_t*);
extern short b_enum_nelem(Namfun_t*);
+extern const char e_alrm1[];
+extern const char e_alrm2[];
extern const char e_badfun[];
extern const char e_baddisc[];
extern const char e_nofork[];
diff --git a/src/cmd/ksh93/include/defs.h b/src/cmd/ksh93/include/defs.h
index 306ea7e..b5bfb67 100644
--- a/src/cmd/ksh93/include/defs.h
+++ b/src/cmd/ksh93/include/defs.h
@@ -143,6 +143,7 @@ extern void sh_subjobcheck(pid_t);
extern int sh_subsavefd(int);
extern void sh_subtmpfile(void);
extern char *sh_substitute(const char*,const char*,char*);
+extern void sh_timetraps(void);
extern const char *_sh_translate(const char*);
extern int sh_trace(char*[],int);
extern void sh_trim(char*);
diff --git a/src/cmd/ksh93/include/fault.h b/src/cmd/ksh93/include/fault.h
index b57a0ab..7750f80 100644
--- a/src/cmd/ksh93/include/fault.h
+++ b/src/cmd/ksh93/include/fault.h
@@ -58,6 +58,7 @@ typedef void (*SH_SIGTYPE)(int,void(*)(int));
#define SH_SIGIGNORE 040 /* default is ignore signal */
#define SH_SIGINTERACTIVE 0100 /* handle interactive specially */
#define SH_SIGTSTP 0200 /* tstp signal received */
+#define SH_SIGALRM 0200 /* timer alarm received */
#define SH_SIGTERM SH_SIGOFF /* term signal received */
#define SH_SIGRUNTIME 0400 /* runtime value */
diff --git a/src/cmd/ksh93/include/shell.h b/src/cmd/ksh93/include/shell.h
index 57c402d..9794995 100644
--- a/src/cmd/ksh93/include/shell.h
+++ b/src/cmd/ksh93/include/shell.h
@@ -211,6 +211,7 @@ struct sh_scoped
char **otrap; /* save parent pseudosignals for v=$(trap) */
char **trapcom; /* EXIT and signals */
char **otrapcom; /* save parent EXIT and signals for v=$(trap) */
+ void *timetrap;
struct Ufunction *real_fun; /* current 'function name' function */
int repl_index;
char *repl_arg;
diff --git a/src/cmd/ksh93/sh/fault.c b/src/cmd/ksh93/sh/fault.c
index 3409a6c..510bf56 100644
--- a/src/cmd/ksh93/sh/fault.c
+++ b/src/cmd/ksh93/sh/fault.c
@@ -447,6 +447,8 @@ void sh_chktrap(void)
sh_exit(sh.exitval);
}
}
+ if(sh.sigflag[SIGALRM]&SH_SIGALRM)
+ sh_timetraps();
#if SHOPT_BGX
if((sh.sigflag[SIGCHLD]&SH_SIGTRAP) && sh.st.trapcom[SIGCHLD])
job_chldtrap(1);
diff --git a/src/cmd/ksh93/sh/jobs.c b/src/cmd/ksh93/sh/jobs.c
index 116ae3b..be333b2 100644
--- a/src/cmd/ksh93/sh/jobs.c
+++ b/src/cmd/ksh93/sh/jobs.c
@@ -1466,6 +1466,8 @@ int job_wait(pid_t pid)
continue;
if(nochild)
break;
+ if(sh.sigflag[SIGALRM]&SH_SIGTRAP)
+ sh_timetraps();
if((intr && sh.trapnote) || (pid==1 && !intr))
break;
}
diff --git a/src/cmd/ksh93/tests/builtins.sh b/src/cmd/ksh93/tests/builtins.sh
index 83b4086..92d2708 100755
--- a/src/cmd/ksh93/tests/builtins.sh
+++ b/src/cmd/ksh93/tests/builtins.sh
@@ -1222,6 +1222,28 @@ function test_usage
done 3< <(builtin)
}; test_usage
+# ======
+# The 'alarm' builtin could make 'read' crash due to IFS table corruption caused by unsafe asynchronous execution.
+# https://bugzilla.redhat.com/1176670
+if (builtin alarm) 2>/dev/null
+then got=$( { "$SHELL" -c '
+ builtin alarm
+ alarm -r alarm_handler +.005
+ i=0
+ function alarm_handler.alarm
+ {
+ let "(++i) > 20" && exit
+ }
+ while :; do
+ echo cargo,odds and ends,jetsam,junk,wreckage,castoffs,sea-drift
+ done | while IFS="," read arg1 arg2 arg3 arg4 junk; do
+ :
+ done
+ '; } 2>&1)
+ ((!(e = $?))) || err_exit 'crash with alarm and IFS' \
+ "(got status $e$( ((e>128)) && print -n /SIG && kill -l "$e"), $(printf %q "$got"))"
+fi
+
# ======
# Verify that the POSIX 'test' builtin exits with status 2 when given an invalid binary operator.
for operator in '===' ']]'
@@ -1581,7 +1603,7 @@ let Errors+=$?
# Most built-ins should handle --version
while IFS= read -r bltin <&3
do case $bltin in
- echo | test | true | false | \[ | : | catclose | catgets | catopen | Dt* | _Dt* | X* | login | newgrp )
+ alarm | echo | test | true | false | \[ | : | catclose | catgets | catopen | Dt* | _Dt* | X* | login | newgrp )
continue ;;
fc | hist )
((SHOPT_SCRIPTONLY)) && continue ;;