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From: Daniel Micay <danielmicay@gmail.com>
To: Daniel Axtens <dja@axtens.net>
Cc: Kernel Hardening <kernel-hardening@lists.openwall.com>,
	Linux-MM <linux-mm@kvack.org>, Kees Cook <keescook@chromium.org>,
	kernel list <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 5/5] [RFC] mm: annotate memory allocation functions with their sizes
Date: Fri, 7 Feb 2020 15:38:22 -0500	[thread overview]
Message-ID: <CA+DvKQJ6jRHZeZteqY7q-9sU8v3xacSPj65uac3PQfst4cKiMA@mail.gmail.com> (raw)
In-Reply-To: <20200120074344.504-6-dja@axtens.net>

There are some uses of ksize in the kernel making use of the real
usable size of memory allocations rather than only the requested
amount. It's incorrect when mixed with alloc_size markers, since if a
number like 14 is passed that's used as the upper bound, rather than a
rounded size like 16 returned by ksize. It's unlikely to trigger any
issues with only CONFIG_FORTIFY_SOURCE, but it becomes more likely
with -fsanitize=object-size or other library-based usage of
__builtin_object_size.

  parent reply	other threads:[~2020-02-07 20:38 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-20  7:43 [PATCH 0/5] Annotate allocation functions with alloc_size attribute Daniel Axtens
2020-01-20  7:43 ` [PATCH 1/5] altera-stapl: altera_get_note: prevent write beyond end of 'key' Daniel Axtens
2020-01-20  7:43 ` [PATCH 2/5] [RFC] kasan: kasan_test: hide allocation sizes from the compiler Daniel Axtens
2020-01-20  7:43 ` [PATCH 3/5] [RFC] staging: rts5208: make len a u16 in rtsx_write_cfg_seq Daniel Axtens
2020-01-20  7:43 ` [PATCH 4/5] [VERY RFC] mm: kmalloc(_node): return NULL immediately for SIZE_MAX Daniel Axtens
2020-01-20 11:14   ` Michal Hocko
2020-01-20 22:51     ` Daniel Axtens
2020-01-20  7:43 ` [PATCH 5/5] [RFC] mm: annotate memory allocation functions with their sizes Daniel Axtens
2020-01-20 11:57   ` kbuild test robot
2020-02-07 20:38   ` Daniel Micay [this message]
2020-02-07 20:38     ` Daniel Micay
2020-02-25 18:35     ` Kees Cook
2020-02-26  6:07       ` Daniel Axtens
2020-02-26 21:56         ` Kees Cook

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