From: Borislav Petkov <bp@alien8.de>
To: Thomas Garnier <thgarnie@google.com>
Cc: "David Howells" <dhowells@redhat.com>,
"Dave Hansen" <dave.hansen@intel.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Al Viro" <viro@zeniv.linux.org.uk>,
"René Nyffenegger" <mail@renenyffenegger.ch>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Kees Cook" <keescook@chromium.org>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
"David S . Miller" <davem@davemloft.net>,
"Andy Lutomirski" <luto@kernel.org>,
"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
"Nicolas Pitre" <nicolas.pitre@linaro.org>,
"Petr Mladek" <pmladek@suse.com>,
"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>,
"Sergey Senozhatsky" <sergey.senozhatsky@gmail.com>,
"Helge Deller" <deller@gmx.de>, "Rik van Riel" <riel@redhat.com>,
"Ingo Molnar" <mingo@kernel.org>,
"Oleg Nesterov" <oleg@redhat.com>,
"John Stultz" <john.stultz@linaro.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Pavel Tikhomirov" <ptikhomirov@virtuozzo.com>
Subject: Re: [PATCH v2 1/4] syscalls: Restore address limit after a syscall
Date: Thu, 9 Mar 2017 09:42:08 +0100 [thread overview]
Message-ID: <20170309084208.ims3ehcnieo7uqew@pd.tnic> (raw)
In-Reply-To: <20170309012456.5631-1-thgarnie@google.com>
On Wed, Mar 08, 2017 at 05:24:53PM -0800, Thomas Garnier wrote:
> @@ -191,6 +191,22 @@ extern struct trace_event_functions exit_syscall_print_funcs;
> SYSCALL_METADATA(sname, x, __VA_ARGS__) \
> __SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
>
> +asmlinkage void verify_pre_usermode_state(void);
> +
> +#ifndef CONFIG_ARCH_NO_SYSCALL_VERIFY_PRE_USERMODE_STATE
> +static inline bool has_user_ds(void) {
> + bool ret = segment_eq(get_fs(), USER_DS);
> + // Prevent re-ordering the call
This is not the kernel comments style. Use /* */ instead.
> + barrier();
> + return ret;
> +}
> +#else
> +static inline bool has_user_ds(void) {
> + return false;
> +}
> +#endif
... and then you could slim down the ifdeffery a bit:
static inline bool has_user_ds(void) {
bool ret = false;
#ifndef CONFIG_ARCH_NO_SYSCALL_VERIFY_PRE_USERMODE_STATE
ret = segment_eq(get_fs(), USER_DS);
/* Prevent re-ordering the call. */
barrier();
#endif
return ret;
}
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2017-03-09 8:42 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-09 1:24 [PATCH v2 1/4] syscalls: Restore address limit after a syscall Thomas Garnier
2017-03-09 1:24 ` [PATCH v2 2/4] x86/syscalls: Specific usage of verify_pre_usermode_state Thomas Garnier
2017-03-09 1:24 ` [PATCH v2 3/4] arm/syscalls: " Thomas Garnier
2017-03-09 1:24 ` [PATCH v2 4/4] arm64/syscalls: " Thomas Garnier
2017-03-09 12:23 ` Mark Rutland
2017-03-09 15:56 ` Thomas Garnier
2017-03-09 16:05 ` Mark Rutland
2017-03-09 16:19 ` Thomas Garnier
2017-03-09 16:26 ` Russell King - ARM Linux
2017-03-09 16:35 ` Thomas Garnier
2017-03-09 17:05 ` Russell King - ARM Linux
2017-03-09 8:42 ` Borislav Petkov [this message]
2017-03-09 15:48 ` [PATCH v2 1/4] syscalls: Restore address limit after a syscall Thomas Garnier
2017-03-09 17:27 ` Andy Lutomirski
2017-03-09 17:41 ` Thomas Garnier
2017-03-09 10:39 ` Sergey Senozhatsky
2017-03-09 12:09 ` Mark Rutland
2017-03-09 13:44 ` Russell King - ARM Linux
2017-03-09 15:21 ` Mark Rutland
2017-03-09 15:54 ` Thomas Garnier
2017-03-09 15:52 ` Thomas Garnier
2017-03-09 12:32 ` Christian Borntraeger
2017-03-09 15:53 ` Thomas Garnier
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