Subject: Re: [PATCH v2 61/63] powerpc: Split memset() to avoid multi-field overflow

From: Kees Cook <[email-masked]>
Date: Wed, 18 Aug 2021 15:30:01 -0700

On Wed, Aug 18, 2021 at 08:42:18AM +0200, Christophe Leroy wrote:
> 
> 
> Le 18/08/2021 à 08:05, Kees Cook a écrit :
> > In preparation for FORTIFY_SOURCE performing compile-time and run-time
> > field bounds checking for memset(), avoid intentionally writing across
> > neighboring fields.
> > 
> > Instead of writing across a field boundary with memset(), move the call
> > to just the array, and an explicit zeroing of the prior field.
> > 
> > Cc: Benjamin Herrenschmidt <[email-masked]>
> > Cc: Qinglang Miao <[email-masked]>
> > Cc: "Gustavo A. R. Silva" <[email-masked]>
> > Cc: Hulk Robot <[email-masked]>
> > Cc: Wang Wensheng <[email-masked]>
> > Cc: [email-masked]
> > Signed-off-by: Kees Cook <[email-masked]>
> > Reviewed-by: Michael Ellerman <[email-masked]>
> > Link: https://lore.kernel.org/lkml/[email-masked]
> > ---
> >   drivers/macintosh/smu.c | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
> > index 94fb63a7b357..59ce431da7ef 100644
> > --- a/drivers/macintosh/smu.c
> > +++ b/drivers/macintosh/smu.c
> > @@ -848,7 +848,8 @@ int smu_queue_i2c(struct smu_i2c_cmd *cmd)
> >   	cmd->read = cmd->info.devaddr & 0x01;
> >   	switch(cmd->info.type) {
> >   	case SMU_I2C_TRANSFER_SIMPLE:
> > -		memset(&cmd->info.sublen, 0, 4);
> > +		cmd->info.sublen = 0;
> > +		memset(&cmd->info.subaddr, 0, 3);
> 
> subaddr[] is a table, should the & be avoided ?

It results in the same thing, but it's better form to not have the &; I
will fix this.

> And while at it, why not use sizeof(subaddr) instead of 3 ?

Agreed. :)

Thanks!

-- 
Kees Cook