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Rebuild for build problems

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- Add fix for rng with VMAP_STACK (rhbz 1383451)
This commit is contained in:
Laura Abbott 2016-10-24 16:09:30 -07:00
parent 817154aa97
commit 6f07a39d66
2 changed files with 64 additions and 1 deletions
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9
kernel.spec
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@ -42,7 +42,7 @@ Summary: The Linux kernel
# For non-released -rc kernels, this will be appended after the rcX and
# gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
#
%global baserelease 1
%global baserelease 2
%global fedora_build %{baserelease}
# base_sublevel is the kernel version we're starting with and patching
@ -606,6 +606,9 @@ Patch848: 0001-cpupower-Correct-return-type-of-cpu_power_is_cpu_onl.patch
#ongoing complaint, full discussion delayed until ksummit/plumbers
Patch849: 0001-iio-Use-event-header-from-kernel-tree.patch
#rhbz 1383451
Patch850: resend-4.9-hw_random-Don-t-use-a-stack-buffer-in-add_early_randomness.patch
# END OF PATCH DEFINITIONS
%endif
@ -2144,6 +2147,10 @@ fi
#
#
%changelog
* Mon Oct 24 2016 Laura Abbott <labbott@redhat.com> - 4.9.0-0.rc2.git0.2
- Rebuild for build problems
- Add fix for rng with VMAP_STACK (rhbz 1383451)
* Mon Oct 24 2016 Laura Abbott <labbott@redhat.com> - 4.9.0-0.rc2.git0.1
- Linux v4.9-rc2

56
resend-4.9-hw_random-Don-t-use-a-stack-buffer-in-add_early_randomness.patch Normal file
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@ -0,0 +1,56 @@
From patchwork Mon Oct 17 17:06:27 2016
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: [resend,
4.9] hw_random: Don't use a stack buffer in add_early_randomness()
From: Andrew Lutomirski <luto@kernel.org>
X-Patchwork-Id: 9380037
Message-Id: <4169224b6858d1cf149f1a73f8a03603fa19076d.1476638125.git.luto@kernel.org>
To: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
Matt Mackall <mpm@selenic.com>, Herbert Xu <herbert@gondor.apana.org.au>,
Rusty Russell <rusty@rustcorp.com.au>
Cc: Jens Axboe <axboe@fb.com>, Matt Mullins <mmullins@mmlx.us>,
Andy Lutomirski <luto@kernel.org>
Date: Mon, 17 Oct 2016 10:06:27 -0700
hw_random carefully avoids using a stack buffer except in
add_early_randomness(). This causes a crash in virtio_rng if
CONFIG_VMAP_STACK=y.
Reported-by: Matt Mullins <mmullins@mmlx.us>
Tested-by: Matt Mullins <mmullins@mmlx.us>
Fixes: d3cc7996473a ("hwrng: fetch randomness only after device init")
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
This fixes a crash in 4.9-rc1.
resending because I typoed the git send-email command. I stealthily added
Matt's Tested-by, too.
drivers/char/hw_random/core.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 9203f2d130c0..340f96e44642 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -84,14 +84,14 @@ static size_t rng_buffer_size(void)
static void add_early_randomness(struct hwrng *rng)
{
- unsigned char bytes[16];
int bytes_read;
+ size_t size = min_t(size_t, 16, rng_buffer_size());
mutex_lock(&reading_mutex);
- bytes_read = rng_get_data(rng, bytes, sizeof(bytes), 1);
+ bytes_read = rng_get_data(rng, rng_buffer, size, 1);
mutex_unlock(&reading_mutex);
if (bytes_read > 0)
- add_device_randomness(bytes, bytes_read);
+ add_device_randomness(rng_buffer, bytes_read);
}
static inline void cleanup_rng(struct kref *kref)