From: Jason Cooper <jason@lakedaemon.net>
To: Kees Cook <keescook@chromium.org>,
Michael Ellerman <mpe@ellerman.id.au>,
"Roberts, William C" <william.c.roberts@intel.com>,
Yann Droneaud <ydroneaud@opteya.com>
Cc: Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
kernel-hardening <kernel-hardening@lists.openwall.com>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Theodore Ts'o <tytso@mit.edu>, Arnd Bergmann <arnd@arndb.de>,
gregkh@linuxfoundation.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Ralf Baechle <ralf@linux-mips.org>,
benh@kernel.crashing.org, paulus@samba.org,
"David S. Miller" <davem@davemloft.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, viro@zeniv.linux.org.uk,
Nick Kralevich <nnk@google.com>,
Jeffrey Vander Stoep <jeffv@google.com>,
Daniel Cashman <dcashman@android.com>,
Jason Cooper <jason@lakedaemon.net>
Subject: [kernel-hardening] [PATCH v3 7/7] random: Remove unused randomize_range()
Date: Wed, 3 Aug 2016 23:39:13 +0000 [thread overview]
Message-ID: <20160803233913.32511-8-jason@lakedaemon.net> (raw)
In-Reply-To: <20160803233913.32511-1-jason@lakedaemon.net>
All call sites for randomize_range have been updated to use the much
simpler and more robust randomize_addr. Remove the now unnecessary
code.
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
---
drivers/char/random.c | 19 -------------------
include/linux/random.h | 1 -
2 files changed, 20 deletions(-)
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 61cb434e3bea..46d332dd27a4 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1821,25 +1821,6 @@ unsigned long get_random_long(void)
}
EXPORT_SYMBOL(get_random_long);
-/*
- * randomize_range() returns a start address such that
- *
- * [...... <range> .....]
- * start end
- *
- * a <range> with size "len" starting at the return value is inside in the
- * area defined by [start, end], but is otherwise randomized.
- */
-unsigned long
-randomize_range(unsigned long start, unsigned long end, unsigned long len)
-{
- unsigned long range = end - len - start;
-
- if (end <= start + len)
- return 0;
- return PAGE_ALIGN(get_random_int() % range + start);
-}
-
/**
* randomize_page - Generate a random, page aligned address
* @start: The smallest acceptable address the caller will take.
diff --git a/include/linux/random.h b/include/linux/random.h
index 098fec690d65..9281dbbb7f4a 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -34,7 +34,6 @@ extern const struct file_operations random_fops, urandom_fops;
unsigned int get_random_int(void);
unsigned long get_random_long(void);
-unsigned long randomize_range(unsigned long start, unsigned long end, unsigned long len);
unsigned long randomize_page(unsigned long start, unsigned long range);
u32 prandom_u32(void);
--
2.9.2
next prev parent reply other threads:[~2016-08-03 23:39 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-28 20:47 [kernel-hardening] [PATCH 0/7] char/random: Simplify random address requests Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 1/7] random: Simplify API for " Jason Cooper
2016-07-29 8:59 ` [kernel-hardening] " Yann Droneaud
2016-07-29 18:20 ` Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 2/7] x86: Use simpler " Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 3/7] ARM: " Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 4/7] arm64: " Jason Cooper
2016-07-29 13:48 ` [kernel-hardening] " Will Deacon
2016-07-28 20:47 ` [kernel-hardening] [PATCH 5/7] tile: " Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 6/7] unicore32: " Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 7/7] random: Remove unused randomize_range() Jason Cooper
2016-07-30 15:42 ` [kernel-hardening] [PATCH v2 0/7] char/random: Simplify random address requests Jason Cooper
2016-07-30 15:42 ` [kernel-hardening] [PATCH v2 1/7] random: Simplify API for " Jason Cooper
2016-07-31 16:46 ` [kernel-hardening] " Kees Cook
2016-07-31 20:56 ` Jason Cooper
2016-08-01 19:47 ` Kees Cook
2016-08-01 23:17 ` Jason Cooper
2016-08-02 3:35 ` Michael Ellerman
2016-08-03 18:42 ` Jason Cooper
2016-07-30 15:42 ` [kernel-hardening] [PATCH v2 2/7] x86: Use simpler " Jason Cooper
2016-07-30 15:42 ` [kernel-hardening] [PATCH v2 3/7] ARM: " Jason Cooper
2016-07-30 15:42 ` [kernel-hardening] [PATCH v2 4/7] arm64: " Jason Cooper
2016-07-30 15:42 ` [kernel-hardening] [PATCH v2 5/7] tile: " Jason Cooper
2016-07-30 15:42 ` [kernel-hardening] [PATCH v2 6/7] unicore32: " Jason Cooper
2016-07-30 15:42 ` [kernel-hardening] [PATCH v2 7/7] random: Remove unused randomize_range() Jason Cooper
2016-08-03 23:39 ` [kernel-hardening] [PATCH v3 0/7] char/random: Simplify random address requests Jason Cooper
2016-08-03 23:39 ` [kernel-hardening] [PATCH v3 1/7] random: Simplify API for " Jason Cooper
2016-08-04 12:47 ` [kernel-hardening] " Yann Droneaud
2016-08-03 23:39 ` [kernel-hardening] [PATCH v3 2/7] x86: Use simpler " Jason Cooper
2016-08-03 23:39 ` [kernel-hardening] [PATCH v3 3/7] ARM: " Jason Cooper
2016-08-03 23:39 ` [kernel-hardening] [PATCH v3 4/7] arm64: " Jason Cooper
2016-08-03 23:39 ` [kernel-hardening] [PATCH v3 5/7] tile: " Jason Cooper
2016-08-03 23:39 ` [kernel-hardening] [PATCH v3 6/7] unicore32: " Jason Cooper
2016-08-03 23:39 ` Jason Cooper [this message]
2016-08-03 23:48 ` [kernel-hardening] Re: [PATCH v3 7/7] random: Remove unused randomize_range() Andrew Morton
2016-08-04 0:19 ` Jason Cooper
2016-08-04 2:41 ` [kernel-hardening] Re: [PATCH v3 0/7] char/random: Simplify random address requests Kees Cook
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