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Sun, 25 May 2025 09:19:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748164804; bh=M6wNUdl+f/LJKZELy9CIlDDMGL8GGdionU7cG+oIVJQ=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Z0e70SglbUOUYIUwGE9EvW/JcY14JljkXPcrXvRwOWMfKnOoZdPxFBk8x8EpFANPI vG1u78itnbNpPvqJV9za7eDRQY7XiGc2O7R63dkSTog6u6Uhs9V0ueAnnn3xAPPb5N NwgpL7Hr54FI18ZatUXKTjIXNlibhMXTDRag936yRj1pELwLfCoJnG4HDYHId6DCex 74tRpY6EUPIkdT8JgYWiDgVG4pfAUzLo+J6CpUlIxjEgTttC2+uVcp+CRt0A56C/PS 4Dw7oQHewMIHBpcl9NpvXPNpOrRqIeUMG/Kt/haznyrvxckVqMqHM4XmaH8IuvBeSY SF/KBNh4I7ppw== Date: Sun, 25 May 2025 10:19:53 +0100 From: Jonathan Cameron To: Markus Burri Cc: linux-kernel@vger.kernel.org, Mahesh J Salgaonkar , "Oliver O'Halloran" , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Jacek Lawrynowicz , Maciej Falkowski , Oded Gabbay , Linus Walleij , Bartosz Golaszewski , Nuno Sa , Olivier Moysan , Lars-Peter Clausen , linuxppc-dev@lists.ozlabs.org, dri-devel@lists.freedesktop.org, linux-gpio@vger.kernel.org, linux-iio@vger.kernel.org, Markus Burri Subject: Re: [PATCH v4 1/6] iio: backend: fix out-of-bound write Message-ID: <20250525101953.7930a410@jic23-huawei> In-Reply-To: <20250511152707.294bc7b9@jic23-huawei> References: <20250508130612.82270-1-markus.burri@mt.com> <20250508130612.82270-2-markus.burri@mt.com> <20250511152707.294bc7b9@jic23-huawei> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.48; x86_64-pc-linux-gnu) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Sun, 11 May 2025 15:27:07 +0100 Jonathan Cameron wrote: > On Thu, 8 May 2025 15:06:07 +0200 > Markus Burri wrote: > > > The buffer is set to 80 character. If a caller write more characters, > > count is truncated to the max available space in "simple_write_to_buffer". > > But afterwards a string terminator is written to the buffer at offset count > > without boundary check. The zero termination is written OUT-OF-BOUND. > > > > Add a check that the given buffer is smaller then the buffer to prevent. > > > > Fixes: 035b4989211d ("iio: backend: make sure to NULL terminate stack buffer") > > Signed-off-by: Markus Burri > I'm looking for a tag from Nuno on this one before applying. Please make sure to pick up tags on earlier versions. Nuno had sent a RB for this one which I've now added. People don't tend to look again at patches that they've already tagged so Nuno probably didn't see my ask for a tag above. Anyhow, now applied but will have to wait for a rebase of my fixes-togreg tree on rc1 once available. Thanks, Jonathan > > J > > --- > > drivers/iio/industrialio-backend.c | 5 ++++- > > 1 file changed, 4 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c > > index a43c8d1bb3d0..31fe793e345e 100644 > > --- a/drivers/iio/industrialio-backend.c > > +++ b/drivers/iio/industrialio-backend.c > > @@ -155,11 +155,14 @@ static ssize_t iio_backend_debugfs_write_reg(struct file *file, > > ssize_t rc; > > int ret; > > > > + if (count >= sizeof(buf)) > > + return -ENOSPC; > > + > > rc = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf, count); > > if (rc < 0) > > return rc; > > > > - buf[count] = '\0'; > > + buf[rc] = '\0'; > > > > ret = sscanf(buf, "%i %i", &back->cached_reg_addr, &val); > > > >