altos: Validate boot chain start address

[fw/altos] / src / stm / ao_boot_chain.c

diff --git a/src/stm/ao_boot_chain.c b/src/stm/ao_boot_chain.c
index 9c63272b34b2261cd77cce868b93b31b0b6ce905..668f6e6d6813aab8d0b6a8afc3190dcc91f7878a 100644 (file)
--- a/src/stm/ao_boot_chain.c
+++ b/src/stm/ao_boot_chain.c
@@ -26,9 +26,11 @@ ao_boot_chain(uint32_t *base)
 
        sp = base[0];
        pc = base[1];
-       asm ("mov sp, %0" : : "r" (sp));
-       asm ("mov lr, %0" : : "r" (pc));
-       asm ("bx lr");
+       if (0x08000100 <= pc && pc <= 0x08200000) {
+               asm ("mov sp, %0" : : "r" (sp));
+               asm ("mov lr, %0" : : "r" (pc));
+               asm ("bx lr");
+       }
 }
 
 #define AO_BOOT_SIGNAL 0x5a5aa5a5