Protect malloc, realloc and free calls with INT{ON,OFF} directly in chkalloc,

ckrealloc and ckfree (added), respectively.  sh jumps out of the signal handler
using longjmp which is obviously a bad idea during malloc calls.

Note: I think there is still a small race here because volatile sig_atomic_t
only guarantees atomic reads and writes while we're doing increments and
decrements.

Protect a setmode call with INT{ON,OFF} as it calls malloc internally.

PR:		45478
Patch from:	Nate Eldredge

1 files changed, 2 insertions, 0 deletions

diff --git a/bin/sh/miscbltin.c b/bin/sh/miscbltin.c
index d36f9e3..7c8981b 100644
--- a/bin/sh/miscbltin.c
+++ b/bin/sh/miscbltin.c
@@ -274,12 +274,14 @@ umaskcmd(int argc __unused, char **argv)
 			umask(mask);
 		} else {
 			void *set;
+			INTOFF;
 			if ((set = setmode (ap)) == 0)
 				error("Illegal number: %s", ap);
 
 			mask = getmode (set, ~mask & 0777);
 			umask(~mask & 0777);
 			free(set);
+			INTON;
 		}
 	}
 	return 0;