linux-hardening - Re: [PATCH v2 1/2][next] wl3501_cs: Fix out-of-bounds warning in wl3501_send

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Date:   Wed, 7 Apr 2021 11:56:06 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 1/2][next] wl3501_cs: Fix out-of-bounds warning in
 wl3501_send_pkt

On Wed, Mar 31, 2021 at 04:44:29PM -0500, Gustavo A. R. Silva wrote:
> Fix the following out-of-bounds warning by enclosing
> structure members daddr and saddr into new struct addr:
> 
> arch/x86/include/asm/string_32.h:182:25: warning: '__builtin_memcpy' offset [18, 23] from the object at 'sig' is out of the bounds of referenced subobject 'daddr' with type 'u8[6]' {aka 'unsigned char[6]'} at offset 11 [-Warray-bounds]
> 
> Refactor the code, accordingly:
> 
> $ pahole -C wl3501_md_req drivers/net/wireless/wl3501_cs.o
> struct wl3501_md_req {
> 	u16                        next_blk;             /*     0     2 */
> 	u8                         sig_id;               /*     2     1 */
> 	u8                         routing;              /*     3     1 */
> 	u16                        data;                 /*     4     2 */
> 	u16                        size;                 /*     6     2 */
> 	u8                         pri;                  /*     8     1 */
> 	u8                         service_class;        /*     9     1 */
> 	struct {
> 		u8                 daddr[6];             /*    10     6 */
> 		u8                 saddr[6];             /*    16     6 */
> 	} addr;                                          /*    10    12 */
> 
> 	/* size: 22, cachelines: 1, members: 8 */
> 	/* last cacheline: 22 bytes */
> };
> 
> The problem is that the original code is trying to copy data into a
> couple of arrays adjacent to each other in a single call to memcpy().
> Now that a new struct _addr_ enclosing those two adjacent arrays
> is introduced, memcpy() doesn't overrun the length of &sig.daddr[0],
> because the address of the new struct object _addr_ is used as
> destination, instead.
> 
> Also, this helps with the ongoing efforts to enable -Warray-bounds and
> avoid confusing the compiler.
> 
> Link: https://github.com/KSPP/linux/issues/109
> Reported-by: kernel test robot <lkp@...el.com>
> Build-tested-by: kernel test robot <lkp@...el.com>
> Link: https://lore.kernel.org/lkml/60641d9b.2eNLedOGSdcSoAV2%25lkp@intel.com/
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks, this makes the code much easier for the compiler to validate
at compile time. These cross-field memcpy()s are weird. I like the
solution here.

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook