11.0.0: Difference between revisions

Line 275:

CFI is implemented as follows: blr instructions no longer exist. When funcptrs are called, new functions are now called instead which handles the call. The u32 at funcptr_addr-4 must match 0xe7ffdefe, otherwise it will branch to undefined instruction 0x0000dead. Otherwise, it will jump to the funcptr_addr.

Almost all functions now have the above u32 at -4, therefore funcptr calls now have to start at the actual funcptr start. However, this doesn't apply to calls done during functions' exit: these directly br to the funcptr_addr without extra validation.

Almost all functions now have the above u32 at -4, therefore funcptr calls now have to start at the actual funcptr start. However, this doesn't apply to calls done during functions' exit: these directly br to the funcptr_addr without extra validation. The br instructions in the .plt were also replaced with branches to the function described above.

The above applies to all NSOs in ExeFs, except for LibraryAppletOfflineWeb which doesn't have it enabled. The NROs in the BrowserDll SystemData have it enabled for "/nro/netfront/dll_1/", however "dll_0" doesn't have it enabled (which is used by LibraryAppletOfflineWeb).

@@ Line 275: / Line 275: @@
 CFI is implemented as follows: blr instructions no longer exist. When funcptrs are called, new functions are now called instead which handles the call. The u32 at funcptr_addr-4 must match 0xe7ffdefe, otherwise it will branch to undefined instruction 0x0000dead. Otherwise, it will jump to the funcptr_addr.
-Almost all functions now have the above u32 at -4, therefore funcptr calls now have to start at the actual funcptr start. However, this doesn't apply to calls done during functions' exit: these directly br to the funcptr_addr without extra validation.
+Almost all functions now have the above u32 at -4, therefore funcptr calls now have to start at the actual funcptr start. However, this doesn't apply to calls done during functions' exit: these directly br to the funcptr_addr without extra validation. The br instructions in the .plt were also replaced with branches to the function described above.
 The above applies to all NSOs in ExeFs, except for LibraryAppletOfflineWeb which doesn't have it enabled. The NROs in the BrowserDll SystemData have it enabled for "/nro/netfront/dll_1/", however "dll_0" doesn't have it enabled (which is used by LibraryAppletOfflineWeb).