media: saa7164: fix double fetch PCIe access condition (CVE-2017-8831)
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@ -26,6 +26,7 @@ linux (4.12.3-1~exp1) UNRELEASED; urgency=medium
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[ Salvatore Bonaccorso ]
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* dentry name snapshots (CVE-2017-7533)
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* ipv6: avoid overflow of offset in ip6_find_1stfragopt (CVE-2017-7542)
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* media: saa7164: fix double fetch PCIe access condition (CVE-2017-8831)
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-- Ben Hutchings <ben@decadent.org.uk> Tue, 18 Jul 2017 13:26:41 +0100
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77
debian/patches/bugfix/all/media-saa7164-fix-double-fetch-PCIe-access-condition.patch
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77
debian/patches/bugfix/all/media-saa7164-fix-double-fetch-PCIe-access-condition.patch
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@ -0,0 +1,77 @@
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From: Steven Toth <stoth@kernellabs.com>
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Date: Tue, 6 Jun 2017 09:30:27 -0300
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Subject: [media] saa7164: fix double fetch PCIe access condition
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Origin: https://git.kernel.org/linus/6fb05e0dd32e566facb96ea61a48c7488daa5ac3
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Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2017-8831
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Avoid a double fetch by reusing the values from the prior transfer.
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Originally reported via https://bugzilla.kernel.org/show_bug.cgi?id=195559
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Thanks to Pengfei Wang <wpengfeinudt@gmail.com> for reporting.
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Signed-off-by: Steven Toth <stoth@kernellabs.com>
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Reported-by: Pengfei Wang <wpengfeinudt@gmail.com>
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Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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---
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drivers/media/pci/saa7164/saa7164-bus.c | 13 +------------
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1 file changed, 1 insertion(+), 12 deletions(-)
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diff --git a/drivers/media/pci/saa7164/saa7164-bus.c b/drivers/media/pci/saa7164/saa7164-bus.c
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index b2ff82fa7116..ecfeac5cdbed 100644
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--- a/drivers/media/pci/saa7164/saa7164-bus.c
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+++ b/drivers/media/pci/saa7164/saa7164-bus.c
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@@ -389,11 +389,11 @@ int saa7164_bus_get(struct saa7164_dev *dev, struct tmComResInfo* msg,
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msg_tmp.size = le16_to_cpu((__force __le16)msg_tmp.size);
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msg_tmp.command = le32_to_cpu((__force __le32)msg_tmp.command);
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msg_tmp.controlselector = le16_to_cpu((__force __le16)msg_tmp.controlselector);
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+ memcpy(msg, &msg_tmp, sizeof(*msg));
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/* No need to update the read positions, because this was a peek */
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/* If the caller specifically want to peek, return */
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if (peekonly) {
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- memcpy(msg, &msg_tmp, sizeof(*msg));
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goto peekout;
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}
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@@ -438,21 +438,15 @@ int saa7164_bus_get(struct saa7164_dev *dev, struct tmComResInfo* msg,
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space_rem = bus->m_dwSizeGetRing - curr_grp;
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if (space_rem < sizeof(*msg)) {
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- /* msg wraps around the ring */
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- memcpy_fromio(msg, bus->m_pdwGetRing + curr_grp, space_rem);
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- memcpy_fromio((u8 *)msg + space_rem, bus->m_pdwGetRing,
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- sizeof(*msg) - space_rem);
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if (buf)
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memcpy_fromio(buf, bus->m_pdwGetRing + sizeof(*msg) -
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space_rem, buf_size);
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} else if (space_rem == sizeof(*msg)) {
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- memcpy_fromio(msg, bus->m_pdwGetRing + curr_grp, sizeof(*msg));
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if (buf)
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memcpy_fromio(buf, bus->m_pdwGetRing, buf_size);
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} else {
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/* Additional data wraps around the ring */
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- memcpy_fromio(msg, bus->m_pdwGetRing + curr_grp, sizeof(*msg));
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if (buf) {
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memcpy_fromio(buf, bus->m_pdwGetRing + curr_grp +
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sizeof(*msg), space_rem - sizeof(*msg));
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@@ -465,15 +459,10 @@ int saa7164_bus_get(struct saa7164_dev *dev, struct tmComResInfo* msg,
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} else {
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/* No wrapping */
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- memcpy_fromio(msg, bus->m_pdwGetRing + curr_grp, sizeof(*msg));
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if (buf)
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memcpy_fromio(buf, bus->m_pdwGetRing + curr_grp + sizeof(*msg),
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buf_size);
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}
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- /* Convert from little endian to CPU */
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- msg->size = le16_to_cpu((__force __le16)msg->size);
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- msg->command = le32_to_cpu((__force __le32)msg->command);
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- msg->controlselector = le16_to_cpu((__force __le16)msg->controlselector);
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/* Update the read positions, adjusting the ring */
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saa7164_writel(bus->m_dwGetReadPos, new_grp);
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--
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2.11.0
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@ -119,6 +119,7 @@ features/all/lockdown/arm64-add-kernel-config-option-to-lock-down-when.patch
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debian/i386-686-pae-pci-set-pci-nobios-by-default.patch
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bugfix/all/dentry-name-snapshots.patch
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bugfix/all/ipv6-avoid-overflow-of-offset-in-ip6_find_1stfragopt.patch
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bugfix/all/media-saa7164-fix-double-fetch-PCIe-access-condition.patch
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# Fix exported symbol versions
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bugfix/alpha/alpha-restore-symbol-versions-for-symbols-exported-f.patch
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