linux-kernel - [PATCH 4.9 04/35] MIPS: relocatable: fix possible boot hangup with KASLR enabled

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Date:   Fri, 22 Jan 2021 15:10:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alexander Lobakin <alobakin@...me>,
        Nathan Chancellor <natechancellor@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: [PATCH 4.9 04/35] MIPS: relocatable: fix possible boot hangup with KASLR enabled

From: Alexander Lobakin <alobakin@...me>

commit 69e976831cd53f9ba304fd20305b2025ecc78eab upstream.

LLVM-built Linux triggered a boot hangup with KASLR enabled.

arch/mips/kernel/relocate.c:get_random_boot() uses linux_banner,
which is a string constant, as a random seed, but accesses it
as an array of unsigned long (in rotate_xor()).
When the address of linux_banner is not aligned to sizeof(long),
such access emits unaligned access exception and hangs the kernel.

Use PTR_ALIGN() to align input address to sizeof(long) and also
align down the input length to prevent possible access-beyond-end.

Fixes: 405bc8fd12f5 ("MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE")
Cc: stable@...r.kernel.org # 4.7+
Signed-off-by: Alexander Lobakin <alobakin@...me>
Tested-by: Nathan Chancellor <natechancellor@...il.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/kernel/relocate.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/arch/mips/kernel/relocate.c
+++ b/arch/mips/kernel/relocate.c
@@ -175,8 +175,14 @@ static int __init relocate_exception_tab
 static inline __init unsigned long rotate_xor(unsigned long hash,
 					      const void *area, size_t size)
 {
-	size_t i;
-	unsigned long *ptr = (unsigned long *)area;
+	const typeof(hash) *ptr = PTR_ALIGN(area, sizeof(hash));
+	size_t diff, i;
+
+	diff = (void *)ptr - area;
+	if (unlikely(size < diff + sizeof(hash)))
+		return hash;
+
+	size = ALIGN_DOWN(size - diff, sizeof(hash));
 
 	for (i = 0; i < size / sizeof(hash); i++) {
 		/* Rotate by odd number of bits and XOR. */