From: Jessica Yu <jeyu@kernel.org>
To: Kees Cook <keescook@chromium.org>
Cc: Dominik Czarnota <dominik.czarnota@trailofbits.com>,
stable@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
KP Singh <kpsingh@chromium.org>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
"David S. Miller" <davem@davemloft.net>,
Masami Hiramatsu <mhiramat@kernel.org>,
Jakub Kicinski <kuba@kernel.org>,
"Steven Rostedt (VMware)" <rostedt@goodmis.org>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Will Deacon <will@kernel.org>,
Alexey Dobriyan <adobriyan@gmail.com>,
Marc Zyngier <maz@kernel.org>,
Masahiro Yamada <masahiroy@kernel.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Matteo Croce <mcroce@redhat.com>,
Edward Cree <ecree@solarflare.com>,
Nicolas Dichtel <nicolas.dichtel@6wind.com>,
Alexander Lobakin <alobakin@dlink.ru>,
Thomas Richter <tmricht@linux.ibm.com>,
Ingo Molnar <mingo@kernel.org>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/5] module: Do not expose section addresses to non-CAP_SYSLOG
Date: Wed, 8 Jul 2020 18:12:33 +0200 [thread overview]
Message-ID: <20200708161233.GB5609@linux-8ccs.fritz.box> (raw)
In-Reply-To: <20200702232638.2946421-4-keescook@chromium.org>
+++ Kees Cook [02/07/20 16:26 -0700]:
>The printing of section addresses in /sys/module/*/sections/* was not
>using the correct credentials to evaluate visibility.
>
>Before:
>
> # cat /sys/module/*/sections/.*text
> 0xffffffffc0458000
> ...
> # capsh --drop=CAP_SYSLOG -- -c "cat /sys/module/*/sections/.*text"
> 0xffffffffc0458000
> ...
>
>After:
>
> # cat /sys/module/*/sections/*.text
> 0xffffffffc0458000
> ...
> # capsh --drop=CAP_SYSLOG -- -c "cat /sys/module/*/sections/.*text"
> 0x0000000000000000
> ...
>
>Additionally replaces the existing (safe) /proc/modules check with
>file->f_cred for consistency.
>
>Cc: stable@vger.kernel.org
>Reported-by: Dominik Czarnota <dominik.czarnota@trailofbits.com>
>Fixes: be71eda5383f ("module: Fix display of wrong module .text address")
>Signed-off-by: Kees Cook <keescook@chromium.org>
Tested-by: Jessica Yu <jeyu@kernel.org>
Acked-by: Jessica Yu <jeyu@kernel.org>
next prev parent reply other threads:[~2020-07-08 16:12 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-02 23:26 [PATCH 0/5] Refactor kallsyms_show_value() users for correct cred Kees Cook
2020-07-02 23:26 ` [PATCH 1/5] kallsyms: Refactor kallsyms_show_value() to take cred Kees Cook
2020-07-02 23:26 ` [PATCH 2/5] module: Refactor section attr into bin attribute Kees Cook
2020-07-03 6:02 ` Greg Kroah-Hartman
2020-07-03 15:29 ` Kees Cook
2020-07-08 16:10 ` Jessica Yu
2020-07-02 23:26 ` [PATCH 3/5] module: Do not expose section addresses to non-CAP_SYSLOG Kees Cook
2020-07-08 16:12 ` Jessica Yu [this message]
2020-07-02 23:26 ` [PATCH 4/5] kprobes: Do not expose probe " Kees Cook
2020-07-03 1:00 ` Linus Torvalds
2020-07-03 15:13 ` Kees Cook
2020-07-03 15:50 ` Kees Cook
2020-07-05 20:10 ` Linus Torvalds
2020-07-05 20:19 ` Kees Cook
2020-07-10 14:09 ` Masami Hiramatsu
2020-07-02 23:26 ` [PATCH 5/5] bpf: Check correct cred for CAP_SYSLOG in bpf_dump_raw_ok() Kees Cook
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