[PATCH 0/3] MR2333: win32u / winex11: Avoid invalid writes on WOW64 with kernel-side Nt syscalls.

[Rémi Bernon (＠rbernon)]

On WOW64, Nt calls expect a 64-bit IO_STATUS_BLOCK with .Pointer pointing to the 32-bit IOSB. When Nt calls are made from the unix side we need to initialize the pointer to NULL to, at least, discard the IOSB results and avoid invalid writes.

There's the same problem in wineandroid.drv `android_ioctl`, but it is more complicated. The IOSB result is actually read, so instead of a NULL pointer it will need to point to a 32-bit IOSB, and to check whether the process is WOW64 or not when reading the result.

It's more complicated and I preferred to not make the change. Note that anything that needs the IOSB result from the unix side will face the same problem, and it would maybe be nice to have a general solution.