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authorDenys Vlasenko <vda.linux@googlemail.com>2020-02-20 16:54:29 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2020-02-20 16:54:29 +0100
commitf977e004cefe46e8010c3d29681d77da50e380a9 (patch)
tree39c1afc6b44350bd56fe03ed59afb8f4bfae645e
parentcd24a506336f84ff2bb3318bc4f2f82dd025f318 (diff)
downloadbusybox-f977e004cefe46e8010c3d29681d77da50e380a9.tar.gz
ash: eval: Only restore exit status on exit/return
Upstream commit: Date: Fri, 14 Dec 2018 13:52:02 +0800 eval: Only restore exit status on exit/return We unconditionally restore the saved status in exitreset, which is incorrect as we only want to do it for exitcmd and returncmd. This patch fixes the problem by introducing EXEND. Reported-by: Martijn Dekker <martijn@inlv.org> Fixes: da30b4b78769 ("[BUILTIN] Exit without arguments in a trap...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--shell/ash.c99
1 files changed, 51 insertions, 48 deletions
diff --git a/shell/ash.c b/shell/ash.c
index bea24601c..fd2fc9f23 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -404,11 +404,11 @@ struct globals_misc {
volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
volatile /*sig_atomic_t*/ smallint got_sigchld; /* 1 = got SIGCHLD */
volatile /*sig_atomic_t*/ smallint pending_sig; /* last pending signal */
- smallint exception_type; /* kind of exception (0..5) */
- /* exceptions */
+ smallint exception_type; /* kind of exception: */
#define EXINT 0 /* SIGINT received */
#define EXERROR 1 /* a generic error */
-#define EXEXIT 4 /* exit the shell */
+#define EXEND 3 /* exit the shell */
+#define EXEXIT 4 /* exit the shell via exitcmd */
char nullstr[1]; /* zero length string */
@@ -8237,7 +8237,7 @@ static void shellexec(char *prog, char **argv, const char *path, int idx)
exitstatus = exerrno;
TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
prog, e, suppress_int));
- ash_msg_and_raise(EXEXIT, "%s: %s", prog, errmsg(e, "not found"));
+ ash_msg_and_raise(EXEND, "%s: %s", prog, errmsg(e, "not found"));
/* NOTREACHED */
}
@@ -9291,9 +9291,9 @@ evaltree(union node *n, int flags)
dotrap();
if (checkexit & status)
- raise_exception(EXEXIT);
+ raise_exception(EXEND);
if (flags & EV_EXIT)
- raise_exception(EXEXIT);
+ raise_exception(EXEND);
popstackmark(&smark);
TRACE(("leaving evaltree (no interrupts)\n"));
@@ -14147,6 +14147,47 @@ ulimitcmd(int argc UNUSED_PARAM, char **argv)
/* ============ main() and helpers */
/*
+ * This routine is called when an error or an interrupt occurs in an
+ * interactive shell and control is returned to the main command loop
+ * but prior to exitshell.
+ */
+static void
+exitreset(void)
+{
+ /* from eval.c: */
+ if (savestatus >= 0) {
+ if (exception_type == EXEXIT || evalskip == SKIPFUNCDEF)
+ exitstatus = savestatus;
+ savestatus = -1;
+ }
+ evalskip = 0;
+ loopnest = 0;
+
+ /* from expand.c: */
+ ifsfree();
+
+ /* from redir.c: */
+ unwindredir(NULL);
+}
+
+/*
+ * This routine is called when an error or an interrupt occurs in an
+ * interactive shell and control is returned to the main command loop.
+ * (In dash, this function is auto-generated by build machinery).
+ */
+static void
+reset(void)
+{
+ /* from input.c: */
+ g_parsefile->left_in_buffer = 0;
+ g_parsefile->left_in_line = 0; /* clear input buffer */
+ popallfiles();
+
+ /* from var.c: */
+ unwindlocalvars(NULL);
+}
+
+/*
* Called to exit the shell.
*/
static void
@@ -14169,15 +14210,17 @@ exitshell(void)
trap[0] = NULL;
evalskip = 0;
evalstring(p, 0);
+ evalskip = SKIPFUNCDEF;
/*free(p); - we'll exit soon */
}
out:
+ exitreset();
/* dash wraps setjobctl(0) in "if (setjmp(loc.loc) == 0) {...}".
* our setjobctl(0) does not panic if tcsetpgrp fails inside it.
*/
setjobctl(0);
flush_stdout_stderr();
- _exit(savestatus);
+ _exit(exitstatus);
/* NOTREACHED */
}
@@ -14337,46 +14380,6 @@ read_profile(const char *name)
popfile();
}
-/*
- * This routine is called when an error or an interrupt occurs in an
- * interactive shell and control is returned to the main command loop
- * but prior to exitshell.
- */
-static void
-exitreset(void)
-{
- /* from eval.c: */
- evalskip = 0;
- loopnest = 0;
- if (savestatus >= 0) {
- exitstatus = savestatus;
- savestatus = -1;
- }
-
- /* from expand.c: */
- ifsfree();
-
- /* from redir.c: */
- unwindredir(NULL);
-}
-
-/*
- * This routine is called when an error or an interrupt occurs in an
- * interactive shell and control is returned to the main command loop.
- * (In dash, this function is auto-generated by build machinery).
- */
-static void
-reset(void)
-{
- /* from input.c: */
- g_parsefile->left_in_buffer = 0;
- g_parsefile->left_in_line = 0; /* clear input buffer */
- popallfiles();
-
- /* from var.c: */
- unwindlocalvars(NULL);
-}
-
#if PROFILE
static short profile_buf[16384];
extern int etext();
@@ -14424,7 +14427,7 @@ int ash_main(int argc UNUSED_PARAM, char **argv)
e = exception_type;
s = state;
- if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
+ if (e == EXEND || e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
exitshell();
}