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Message-ID: <202211171349.F42BA5B0@keescook>
Date: Thu, 17 Nov 2022 13:57:13 -0800
From: Kees Cook <keescook@...omium.org>
To: "Jason A. Donenfeld" <Jason@...c4.com>
Cc: linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jakub Kicinski <kuba@...nel.org>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Heiko Carstens <hca@...ux.ibm.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
Christoph Böhmwalder
<christoph.boehmwalder@...bit.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Jason Gunthorpe <jgg@...dia.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
"Martin K . Petersen" <martin.petersen@...cle.com>,
Theodore Ts'o <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Jaegeuk Kim <jaegeuk@...nel.org>,
Richard Weinberger <richard@....at>,
"Darrick J . Wong" <djwong@...nel.org>,
SeongJae Park <sj@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Michael Ellerman <mpe@...erman.id.au>,
Helge Deller <deller@....de>, netdev@...r.kernel.org,
linux-crypto@...r.kernel.org, linux-block@...r.kernel.org,
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linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-mmc@...r.kernel.org, linux-parisc@...r.kernel.org
Subject: Re: [PATCH v3 3/3] treewide: use get_random_u32_inclusive() when
possible
On Thu, Nov 17, 2022 at 09:29:06PM +0100, Jason A. Donenfeld wrote:
> These cases were done with this Coccinelle:
>
> @@
> expression H;
> expression L;
> @@
> - (get_random_u32_below(H) + L)
> + get_random_u32_inclusive(L, H + L - 1)
>
> @@
> expression H;
> expression L;
> expression E;
> @@
> get_random_u32_inclusive(L,
> H
> - + E
> - - E
> )
>
> @@
> expression H;
> expression L;
> expression E;
> @@
> get_random_u32_inclusive(L,
> H
> - - E
> - + E
> )
>
> @@
> expression H;
> expression L;
> expression E;
> expression F;
> @@
> get_random_u32_inclusive(L,
> H
> - - E
> + F
> - + E
> )
>
> @@
> expression H;
> expression L;
> expression E;
> expression F;
> @@
> get_random_u32_inclusive(L,
> H
> - + E
> + F
> - - E
> )
>
> And then subsequently cleaned up by hand, with several automatic cases
> rejected if it didn't make sense contextually.
>
> Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com> # for infiniband
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---
> arch/x86/kernel/module.c | 2 +-
> crypto/rsa-pkcs1pad.c | 2 +-
> crypto/testmgr.c | 10 ++++----
> drivers/bus/mhi/host/internal.h | 2 +-
> drivers/dma-buf/st-dma-fence-chain.c | 2 +-
> drivers/infiniband/core/cma.c | 2 +-
> drivers/infiniband/hw/hns/hns_roce_ah.c | 5 ++--
> drivers/mtd/nand/raw/nandsim.c | 2 +-
> drivers/net/wireguard/selftest/allowedips.c | 8 +++---
> .../broadcom/brcm80211/brcmfmac/p2p.c | 2 +-
> .../net/wireless/intel/iwlwifi/mvm/mac-ctxt.c | 2 +-
> fs/f2fs/segment.c | 6 ++---
> kernel/kcsan/selftest.c | 2 +-
> lib/test_hexdump.c | 10 ++++----
> lib/test_printf.c | 2 +-
> lib/test_vmalloc.c | 6 ++---
> mm/kasan/kasan_test.c | 6 ++---
> mm/kfence/kfence_test.c | 2 +-
> mm/swapfile.c | 5 ++--
> net/bluetooth/mgmt.c | 5 ++--
> net/core/pktgen.c | 25 ++++++++-----------
> net/ipv4/tcp_input.c | 2 +-
> net/ipv6/addrconf.c | 6 ++---
> net/netfilter/nf_nat_helper.c | 2 +-
> net/xfrm/xfrm_state.c | 2 +-
> 25 files changed, 56 insertions(+), 64 deletions(-)
Even the diffstat agrees this is a nice clean-up. :)
Reviewed-by: Kees Cook <keescook@...omium.org>
The only comment I have is that maybe these cases can just be left as-is
with _below()?
> - size_t len = get_random_u32_below(rs) + gs;
> + size_t len = get_random_u32_inclusive(gs, rs + gs - 1);
It seems like writing it in the form of base plus [0, limit) is clearer?
size_t len = gs + get_random_u32_below(rs);
But there is only a handful, so *shrug*
All the others are much cleaner rewritten as _inclusive().
--
Kees Cook
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