Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions).
As found with Coccinelle[1], add __counted_by for struct port_buffer. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Amit Shah <a...@kernel.org> Cc: Arnd Bergmann <a...@arndb.de> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> Cc: virtualization@lists.linux-foundation.org Signed-off-by: Kees Cook <keesc...@chromium.org> --- drivers/char/virtio_console.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 680d1ef2a217..431e9e5bf9c1 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -106,7 +106,7 @@ struct port_buffer { unsigned int sgpages; /* sg is used if spages > 0. sg must be the last in is struct */ - struct scatterlist sg[]; + struct scatterlist sg[] __counted_by(sgpages); }; /* -- 2.34.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
