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usb: Annotate struct urb_priv with __counted_by

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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 urb_priv.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mathias Nyman <mathias.nyman@intel.com>
Cc: linux-usb@vger.kernel.org
Link: https://lore.kernel.org/r/20230915195812.never.371-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2023-09-15 12:58:16 -07:00
parent 2d26302bdf
commit d5ae1c3b97
2 changed files with 2 additions and 2 deletions
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2
drivers/usb/host/ohci.h
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@ -337,7 +337,7 @@ typedef struct urb_priv {
u16 length; // # tds in this request
u16 td_cnt; // tds already serviced
struct list_head pending;
struct td *td[]; // all TDs in this request
struct td *td[] __counted_by(length); // all TDs in this request
} urb_priv_t;

2
drivers/usb/host/xhci.h
View file

@ -1666,7 +1666,7 @@ struct xhci_scratchpad {
struct urb_priv {
int num_tds;
int num_tds_done;
struct xhci_td td[];
struct xhci_td td[] __counted_by(num_tds);
};
/*