| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Sat, 16 Mar 2024 13:52:48 +1100
From: Dave Chinner <david@...morbit.com>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kees Cook <keescook@...omium.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
John Fastabend <john.fastabend@...il.com>,
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>,
KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
Muchun Song <muchun.song@...ux.dev>,
Andrew Morton <akpm@...ux-foundation.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
David Ahern <dsahern@...nel.org>, Simon Horman <horms@...ge.net.au>,
Julian Anastasov <ja@....bg>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...filter.org>,
Florian Westphal <fw@...len.de>,
Luis Chamberlain <mcgrof@...nel.org>,
Joel Granados <j.granados@...sung.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, 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>,
Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
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>,
Phillip Potter <phil@...lpotter.co.uk>,
Theodore Ts'o <tytso@....edu>,
"Jason A. Donenfeld" <Jason@...c4.com>,
Sudip Mukherjee <sudipm.mukherjee@...il.com>,
Mark Rutland <mark.rutland@....com>,
Atish Patra <atishp@...shpatra.org>,
Anup Patel <anup@...infault.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
Eric Biederman <ebiederm@...ssion.com>,
Chandan Babu R <chandan.babu@...cle.com>,
"Darrick J. Wong" <djwong@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Balbir Singh <bsingharora@...il.com>,
"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
Petr Mladek <pmladek@...e.com>,
John Ogness <john.ogness@...utronix.de>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Valentin Schneider <vschneid@...hat.com>,
Andy Lutomirski <luto@...capital.net>,
Will Drewry <wad@...omium.org>, John Stultz <jstultz@...gle.com>,
Stephen Boyd <sboyd@...nel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Roopa Prabhu <roopa@...dia.com>,
Nikolay Aleksandrov <razor@...ckwall.org>,
Remi Denis-Courmont <courmisch@...il.com>,
Allison Henderson <allison.henderson@...cle.com>,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Xin Long <lucien.xin@...il.com>,
Chuck Lever <chuck.lever@...cle.com>,
Jeff Layton <jlayton@...nel.org>, Neil Brown <neilb@...e.de>,
Olga Kornievskaia <kolga@...app.com>, Dai Ngo <Dai.Ngo@...cle.com>,
Tom Talpey <tom@...pey.com>,
Trond Myklebust <trond.myklebust@...merspace.com>,
Anna Schumaker <anna@...nel.org>,
John Johansen <john.johansen@...onical.com>,
Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
"Serge E. Hallyn" <serge@...lyn.com>,
Alexander Popov <alex.popov@...ux.com>,
linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
bpf@...r.kernel.org, linux-mm@...ck.org, netdev@...r.kernel.org,
lvs-devel@...r.kernel.org, netfilter-devel@...r.kernel.org,
coreteam@...filter.org, linux-fsdevel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
linux-xfs@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org, kexec@...ts.infradead.org,
bridge@...ts.linux.dev, linux-rdma@...r.kernel.org,
rds-devel@....oracle.com, linux-sctp@...r.kernel.org,
linux-nfs@...r.kernel.org, apparmor@...ts.ubuntu.com,
linux-security-module@...r.kernel.org
Subject: Re: [PATCH 11/11] sysctl: treewide: constify the ctl_table argument
of handlers
On Fri, Mar 15, 2024 at 09:48:09PM +0100, Thomas Weißschuh wrote:
> Adapt the proc_hander function signature to make it clear that handlers
> are not supposed to modify their ctl_table argument.
>
> This is a prerequisite to moving the static ctl_table structs into
> .rodata.
> By migrating all handlers at once a lengthy transition can be avoided.
>
> The patch was mostly generated by coccinelle with the following script:
>
> @@
> identifier func, ctl, write, buffer, lenp, ppos;
> @@
>
> int func(
> - struct ctl_table *ctl,
> + const struct ctl_table *ctl,
> int write, void *buffer, size_t *lenp, loff_t *ppos)
> { ... }
Which seems to have screwed up the formatting of the XFS code...
> diff --git a/fs/xfs/xfs_sysctl.c b/fs/xfs/xfs_sysctl.c
> index a191f6560f98..a3ca192eca79 100644
> --- a/fs/xfs/xfs_sysctl.c
> +++ b/fs/xfs/xfs_sysctl.c
> @@ -10,12 +10,11 @@ static struct ctl_table_header *xfs_table_header;
>
> #ifdef CONFIG_PROC_FS
> STATIC int
> -xfs_stats_clear_proc_handler(
> - struct ctl_table *ctl,
> - int write,
> - void *buffer,
> - size_t *lenp,
> - loff_t *ppos)
> +xfs_stats_clear_proc_handler(const struct ctl_table *ctl,
> + int write,
> + void *buffer,
> + size_t *lenp,
> + loff_t *ppos)
... because this doesn't match any format I've ever seen in the
kernel. The diff for this change shold be just:
@@ -10,7 +10,7 @@ static struct ctl_table_header *xfs_table_header;
#ifdef CONFIG_PROC_FS
STATIC int
xfs_stats_clear_proc_handler(
- struct ctl_table *ctl,
+ const struct ctl_table *ctl,
int write,
void *buffer,
size_t *lenp,
> {
> int ret, *valp = ctl->data;
>
> @@ -30,12 +29,11 @@ xfs_stats_clear_proc_handler(
> }
>
> STATIC int
> -xfs_panic_mask_proc_handler(
> - struct ctl_table *ctl,
> - int write,
> - void *buffer,
> - size_t *lenp,
> - loff_t *ppos)
> +xfs_panic_mask_proc_handler(const struct ctl_table *ctl,
> + int write,
> + void *buffer,
> + size_t *lenp,
> + loff_t *ppos)
> {
> int ret, *valp = ctl->data;
>
> @@ -51,12 +49,11 @@ xfs_panic_mask_proc_handler(
> #endif /* CONFIG_PROC_FS */
>
> STATIC int
> -xfs_deprecated_dointvec_minmax(
> - struct ctl_table *ctl,
> - int write,
> - void *buffer,
> - size_t *lenp,
> - loff_t *ppos)
> +xfs_deprecated_dointvec_minmax(const struct ctl_table *ctl,
> + int write,
> + void *buffer,
> + size_t *lenp,
> + loff_t *ppos)
> {
> if (write) {
> printk_ratelimited(KERN_WARNING
And these need fixing as well.
A further quick glance at the patch reveals that there are other
similar screwed up conversions as well.
> diff --git a/kernel/delayacct.c b/kernel/delayacct.c
> index 6f0c358e73d8..513791ef573d 100644
> --- a/kernel/delayacct.c
> +++ b/kernel/delayacct.c
> @@ -44,8 +44,9 @@ void delayacct_init(void)
> }
>
> #ifdef CONFIG_PROC_SYSCTL
> -static int sysctl_delayacct(struct ctl_table *table, int write, void *buffer,
> - size_t *lenp, loff_t *ppos)
> +static int sysctl_delayacct(const struct ctl_table *table, int write,
> + void *buffer,
> + size_t *lenp, loff_t *ppos)
> {
> int state = delayacct_on;
> struct ctl_table t;
Like this.
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 724e6d7e128f..e2955e0d9f44 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -450,7 +450,8 @@ static void update_perf_cpu_limits(void)
>
> static bool perf_rotate_context(struct perf_cpu_pmu_context *cpc);
>
> -int perf_event_max_sample_rate_handler(struct ctl_table *table, int write,
> +int perf_event_max_sample_rate_handler(const struct ctl_table *table,
> + int write,
> void *buffer, size_t *lenp, loff_t *ppos)
> {
> int ret;
And this.
> @@ -474,8 +475,10 @@ int perf_event_max_sample_rate_handler(struct ctl_table *table, int write,
>
> int sysctl_perf_cpu_time_max_percent __read_mostly = DEFAULT_CPU_TIME_MAX_PERCENT;
>
> -int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
> - void *buffer, size_t *lenp, loff_t *ppos)
> +int perf_cpu_time_max_percent_handler(const struct ctl_table *table,
> + int write,
> + void *buffer, size_t *lenp,
> + loff_t *ppos)
> {
> int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
>
And this.
> diff --git a/kernel/hung_task.c b/kernel/hung_task.c
> index b2fc2727d654..003f0f5cb111 100644
> --- a/kernel/hung_task.c
> +++ b/kernel/hung_task.c
> @@ -239,9 +239,10 @@ static long hung_timeout_jiffies(unsigned long last_checked,
> /*
> * Process updating of timeout sysctl
> */
> -static int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
> - void *buffer,
> - size_t *lenp, loff_t *ppos)
> +static int proc_dohung_task_timeout_secs(const struct ctl_table *table,
> + int write,
> + void *buffer,
> + size_t *lenp, loff_t *ppos)
> {
> int ret;
>
And this.
> diff --git a/kernel/latencytop.c b/kernel/latencytop.c
> index 781249098cb6..0a5c22b19821 100644
> --- a/kernel/latencytop.c
> +++ b/kernel/latencytop.c
> @@ -65,8 +65,9 @@ static struct latency_record latency_record[MAXLR];
> int latencytop_enabled;
>
> #ifdef CONFIG_SYSCTL
> -static int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
> - size_t *lenp, loff_t *ppos)
> +static int sysctl_latencytop(const struct ctl_table *table, int write,
> + void *buffer,
> + size_t *lenp, loff_t *ppos)
> {
> int err;
>
And this.
I could go on, but there are so many examples of this in the patch
that I think that it needs to be toosed away and regenerated in a
way that doesn't trash the existing function parameter formatting.
-Dave.
--
Dave Chinner
david@...morbit.com
Powered by blists - more mailing lists