linux-hardening - Re: [PATCH bpf-next 2/2] bpf: Take return from set_memory_rox() into account with bpf_jit_binary_lock

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Date: Mon, 19 Feb 2024 15:06:36 +0000
From: Puranjay Mohan <puranjay12@...il.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>, Alexei Starovoitov
 <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko
 <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, Eduard
 Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, Yonghong Song
 <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, KP
 Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo
 <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, Russell King
 <linux@...linux.org.uk>, Zi Shen Lim <zlim.lnx@...il.com>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Tiezhu Yang
 <yangtiezhu@...ngson.cn>, Hengqi Chen <hengqi.chen@...il.com>, Huacai Chen
 <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>, Johan Almbladh
 <johan.almbladh@...finetworks.com>, Paul Burton <paulburton@...nel.org>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, "James E.J. Bottomley"
 <James.Bottomley@...senPartnership.com>, Helge Deller <deller@....de>,
 Ilya Leoshkevich <iii@...ux.ibm.com>, Heiko Carstens <hca@...ux.ibm.com>,
 Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev
 <agordeev@...ux.ibm.com>, Christian Borntraeger
 <borntraeger@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>, "David
 S. Miller" <davem@...emloft.net>, Andreas Larsson <andreas@...sler.com>,
 Wang YanQing <udknight@...il.com>, David Ahern <dsahern@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>, bpf@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
 linux-parisc@...r.kernel.org, linux-s390@...r.kernel.org,
 sparclinux@...r.kernel.org, netdev@...r.kernel.org, Kees Cook
 <keescook@...omium.org>, "linux-hardening @ vger . kernel . org"
 <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH bpf-next 2/2] bpf: Take return from set_memory_rox()
 into account with bpf_jit_binary_lock_ro()

Christophe Leroy <christophe.leroy@...roup.eu> writes:

> set_memory_rox() can fail, leaving memory unprotected.
>
> Check return and bail out when bpf_jit_binary_lock_ro() returns
> and error.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
> Previous patch introduces a dependency on this patch because it modifies bpf_prog_lock_ro(), but they are independant.
> It is possible to apply this patch as standalone by handling trivial conflict with unmodified bpf_prog_lock_ro().
> ---
>  arch/arm/net/bpf_jit_32.c        | 25 ++++++++++++-------------
>  arch/arm64/net/bpf_jit_comp.c    | 21 +++++++++++++++------
>  arch/loongarch/net/bpf_jit.c     | 21 +++++++++++++++------
>  arch/mips/net/bpf_jit_comp.c     |  3 ++-
>  arch/parisc/net/bpf_jit_core.c   |  8 +++++++-
>  arch/s390/net/bpf_jit_comp.c     |  6 +++++-
>  arch/sparc/net/bpf_jit_comp_64.c |  6 +++++-
>  arch/x86/net/bpf_jit_comp32.c    |  3 +--
>  include/linux/filter.h           |  4 ++--
>  9 files changed, 64 insertions(+), 33 deletions(-)
>

Reviewed-by: Puranjay Mohan <puranjay12@...il.com>

Thanks,
Puranjay Mohan