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From: Florian Weimer <fweimer@redhat.com>
To: Dave Martin via Libc-alpha <libc-alpha@sourceware.org>
Cc: Jeremy Linton <jeremy.linton@arm.com>,
	Dave Martin <Dave.Martin@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	systemd-devel@lists.freedesktop.org,
	Kees Cook <keescook@chromium.org>,
	Catalin Marinas <Catalin.Marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Mark Brown <broonie@kernel.org>,
	toiwoton@gmail.com,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: BTI interaction between seccomp filters in systemd and glibc mprotect calls, causing service failures
Date: Mon, 26 Oct 2020 17:45:42 +0100	[thread overview]
Message-ID: <87r1pl9brd.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <20201026162410.GB27285@arm.com> (Dave Martin via Libc-alpha's message of "Mon, 26 Oct 2020 16:24:11 +0000")

* Dave Martin via Libc-alpha:

> Would it now help to add something like:
>
> int mchangeprot(void *addr, size_t len, int old_flags, int new_flags)
> {
> 	int ret = -EINVAL;
> 	mmap_write_lock(current->mm);
> 	if (all vmas in [addr .. addr + len) have
> 			their mprotect flags set to old_flags) {
>
> 		ret = mprotect(addr, len, new_flags);
> 	}
> 	
> 	mmap_write_unlock(current->mm);
> 	return ret;
> }

I suggested something similar as well.  Ideally, the interface would
subsume pkey_mprotect, though, and have a separate flags argument from
the protection flags.  But then we run into argument list length limits.

Thanks,
Florian
-- 
Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
Commercial register: Amtsgericht Muenchen, HRB 153243,
Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill


  parent reply	other threads:[~2020-10-26 16:46 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <8584c14f-5c28-9d70-c054-7c78127d84ea@arm.com>
2020-10-22  7:18 ` [systemd-devel] BTI interaction between seccomp filters in systemd and glibc mprotect calls, causing service failures Lennart Poettering
2020-10-22  7:54   ` Florian Weimer
2020-10-22  8:17     ` Topi Miettinen
2020-10-22  8:25       ` Florian Weimer
2020-10-22  8:29       ` Szabolcs Nagy
2020-10-22  8:38         ` Lennart Poettering
2020-10-22  9:31           ` Catalin Marinas
2020-10-22 10:12             ` Topi Miettinen
2020-10-22 10:27               ` Florian Weimer
2020-10-23  6:13             ` Szabolcs Nagy
2020-10-23  9:04               ` Catalin Marinas
2020-10-22 10:03         ` Topi Miettinen
2020-10-22  8:05   ` Szabolcs Nagy
2020-10-22  8:31     ` Lennart Poettering
     [not found] ` <20201022075447.GO3819@arm.com>
2020-10-22 10:39   ` Topi Miettinen
2020-10-22 20:02     ` Kees Cook
2020-10-22 22:24       ` Topi Miettinen
2020-10-23 17:52         ` Salvatore Mesoraca
2020-10-24 11:34           ` Topi Miettinen
2020-10-24 14:12             ` Salvatore Mesoraca
2020-10-25 13:42               ` Jordan Glover
2020-10-23  9:02       ` Catalin Marinas
2020-10-24 11:01         ` Topi Miettinen
2020-10-26 14:52           ` Catalin Marinas
2020-10-26 15:56             ` Dave Martin
2020-10-26 16:51               ` Mark Brown
2020-10-26 16:31             ` Topi Miettinen
2020-10-26 16:24 ` Dave Martin
2020-10-26 16:39   ` Topi Miettinen
2020-10-26 16:45   ` Florian Weimer [this message]
2020-10-27 14:22     ` Dave Martin
2020-10-27 14:41       ` Florian Weimer
2020-10-26 16:57   ` Szabolcs Nagy
2020-10-26 17:52     ` Dave Martin
2020-10-26 22:39       ` Jeremy Linton
2020-10-27 14:15         ` Dave Martin
2020-10-29 11:02           ` Catalin Marinas
2020-11-04 12:18             ` Dave Martin

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