From 3a09da41027b75ccbe852bd0e0460638d66db6d1 Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Tue, 22 Oct 2013 15:02:28 +0100 Subject: [PATCH] remote: Map invalid signal numbers to GDB_SIGNAL_UNKNOWN. I realized that remote.c is not validating input here. Currently, if a remote stub sends in an invalid signal number (or put another way, if a future stub sends a new signal an old GDB doesn't know about), GDB will do out of bounds accesses in the signal_pass/signal_stop/signal_program arrays. It'll probably be a long while before we add another signal number (and buggy stubs should just be fixed), but can't hurt to be defensive. Tested on x86_64 Fedora 17, native gdbserver. gdb/ 2013-10-22 Pedro Alves * remote.c (remote_parse_stop_reply) <'T'/'S'/'X' replies>: Map invalid signal numbers to GDB_SIGNAL_UNKNOWN. --- gdb/remote.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/gdb/remote.c b/gdb/remote.c index a2e8a01b2f1..7d8a4deb77a 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -5720,9 +5720,16 @@ Packet: '%s'\n"), /* fall through */ case 'S': /* Old style status, just signal only. */ - event->ws.kind = TARGET_WAITKIND_STOPPED; - event->ws.value.sig = (enum gdb_signal) - (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); + { + int sig; + + event->ws.kind = TARGET_WAITKIND_STOPPED; + sig = (fromhex (buf[1]) << 4) + fromhex (buf[2]); + if (GDB_SIGNAL_FIRST <= sig && sig < GDB_SIGNAL_LAST) + event->ws.value.sig = (enum gdb_signal) sig; + else + event->ws.value.sig = GDB_SIGNAL_UNKNOWN; + } break; case 'W': /* Target exited. */ case 'X': @@ -5746,7 +5753,10 @@ Packet: '%s'\n"), { /* The remote process exited with a signal. */ event->ws.kind = TARGET_WAITKIND_SIGNALLED; - event->ws.value.sig = (enum gdb_signal) value; + if (GDB_SIGNAL_FIRST <= value && value < GDB_SIGNAL_LAST) + event->ws.value.sig = (enum gdb_signal) value; + else + event->ws.value.sig = GDB_SIGNAL_UNKNOWN; } /* If no process is specified, assume inferior_ptid. */ -- 2.39.2