--- /dev/null
+From d2ff85854512574e7209f295e87b0835d5b032c6 Mon Sep 17 00:00:00 2001
+From: Kevin Wolf <kwolf@redhat.com>
+Date: Sun, 26 Jul 2015 23:42:53 -0400
+Subject: [PATCH] ide: Check array bounds before writing to io_buffer (CVE-2015-5154)
+
+If the end_transfer_func of a command is called because enough data has
+been read or written for the current PIO transfer, and it fails to
+correctly call the command completion functions, the DRQ bit in the
+status register and s->end_transfer_func may remain set. This allows the
+guest to access further bytes in s->io_buffer beyond s->data_end, and
+eventually overflowing the io_buffer.
+
+One case where this currently happens is emulation of the ATAPI command
+START STOP UNIT.
+
+This patch fixes the problem by adding explicit array bounds checks
+before accessing the buffer instead of relying on end_transfer_func to
+function correctly.
+
+Cc: qemu-stable@nongnu.org
+Signed-off-by: Kevin Wolf <kwolf@redhat.com>
+Reviewed-by: John Snow <jsnow@redhat.com>
+---
+ hw/ide/core.c | 16 ++++++++++++++++
+ 1 files changed, 16 insertions(+), 0 deletions(-)
+
+diff --git a/hw/ide/core.c b/hw/ide/core.c
+index 122e955..44fcc23 100644
+--- a/hw/ide/core.c
++++ b/hw/ide/core.c
+@@ -2021,6 +2021,10 @@ void ide_data_writew(void *opaque, uint32_t addr, uint32_t val)
+ }
+
+ p = s->data_ptr;
++ if (p + 2 > s->data_end) {
++ return;
++ }
++
+ *(uint16_t *)p = le16_to_cpu(val);
+ p += 2;
+ s->data_ptr = p;
+@@ -2042,6 +2046,10 @@ uint32_t ide_data_readw(void *opaque, uint32_t addr)
+ }
+
+ p = s->data_ptr;
++ if (p + 2 > s->data_end) {
++ return 0;
++ }
++
+ ret = cpu_to_le16(*(uint16_t *)p);
+ p += 2;
+ s->data_ptr = p;
+@@ -2063,6 +2071,10 @@ void ide_data_writel(void *opaque, uint32_t addr, uint32_t val)
+ }
+
+ p = s->data_ptr;
++ if (p + 4 > s->data_end) {
++ return;
++ }
++
+ *(uint32_t *)p = le32_to_cpu(val);
+ p += 4;
+ s->data_ptr = p;
+@@ -2084,6 +2096,10 @@ uint32_t ide_data_readl(void *opaque, uint32_t addr)
+ }
+
+ p = s->data_ptr;
++ if (p + 4 > s->data_end) {
++ return 0;
++ }
++
+ ret = cpu_to_le32(*(uint32_t *)p);
+ p += 4;
+ s->data_ptr = p;
+--
+1.7.0.4
+
+
--- /dev/null
+From cb72cba83021fa42719e73a5249c12096a4d1cfc Mon Sep 17 00:00:00 2001
+From: Kevin Wolf <kwolf@redhat.com>
+Date: Sun, 26 Jul 2015 23:42:53 -0400
+Subject: [PATCH] ide: Clear DRQ after handling all expected accesses
+
+This is additional hardening against an end_transfer_func that fails to
+clear the DRQ status bit. The bit must be unset as soon as the PIO
+transfer has completed, so it's better to do this in a central place
+instead of duplicating the code in all commands (and forgetting it in
+some).
+
+Signed-off-by: Kevin Wolf <kwolf@redhat.com>
+Reviewed-by: John Snow <jsnow@redhat.com>
+---
+ hw/ide/core.c | 16 ++++++++++++----
+ 1 files changed, 12 insertions(+), 4 deletions(-)
+
+diff --git a/hw/ide/core.c b/hw/ide/core.c
+index 44fcc23..50449ca 100644
+--- a/hw/ide/core.c
++++ b/hw/ide/core.c
+@@ -2028,8 +2028,10 @@ void ide_data_writew(void *opaque, uint32_t addr, uint32_t val)
+ *(uint16_t *)p = le16_to_cpu(val);
+ p += 2;
+ s->data_ptr = p;
+- if (p >= s->data_end)
++ if (p >= s->data_end) {
++ s->status &= ~DRQ_STAT;
+ s->end_transfer_func(s);
++ }
+ }
+
+ uint32_t ide_data_readw(void *opaque, uint32_t addr)
+@@ -2053,8 +2055,10 @@ uint32_t ide_data_readw(void *opaque, uint32_t addr)
+ ret = cpu_to_le16(*(uint16_t *)p);
+ p += 2;
+ s->data_ptr = p;
+- if (p >= s->data_end)
++ if (p >= s->data_end) {
++ s->status &= ~DRQ_STAT;
+ s->end_transfer_func(s);
++ }
+ return ret;
+ }
+
+@@ -2078,8 +2082,10 @@ void ide_data_writel(void *opaque, uint32_t addr, uint32_t val)
+ *(uint32_t *)p = le32_to_cpu(val);
+ p += 4;
+ s->data_ptr = p;
+- if (p >= s->data_end)
++ if (p >= s->data_end) {
++ s->status &= ~DRQ_STAT;
+ s->end_transfer_func(s);
++ }
+ }
+
+ uint32_t ide_data_readl(void *opaque, uint32_t addr)
+@@ -2103,8 +2109,10 @@ uint32_t ide_data_readl(void *opaque, uint32_t addr)
+ ret = cpu_to_le32(*(uint32_t *)p);
+ p += 4;
+ s->data_ptr = p;
+- if (p >= s->data_end)
++ if (p >= s->data_end) {
++ s->status &= ~DRQ_STAT;
+ s->end_transfer_func(s);
++ }
+ return ret;
+ }
+
+--
+1.7.0.4
--- /dev/null
+From 03441c3a4a42beb25460dd11592539030337d0f8 Mon Sep 17 00:00:00 2001
+From: Kevin Wolf <kwolf@redhat.com>
+Date: Sun, 26 Jul 2015 23:42:53 -0400
+Subject: [PATCH] ide/atapi: Fix START STOP UNIT command completion
+
+The command must be completed on all code paths. START STOP UNIT with
+pwrcnd set should succeed without doing anything.
+
+Signed-off-by: Kevin Wolf <kwolf@redhat.com>
+Reviewed-by: John Snow <jsnow@redhat.com>
+---
+ hw/ide/atapi.c | 1 +
+ 1 files changed, 1 insertions(+), 0 deletions(-)
+
+diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
+index 950e311..79dd167 100644
+--- a/hw/ide/atapi.c
++++ b/hw/ide/atapi.c
+@@ -983,6 +983,7 @@ static void cmd_start_stop_unit(IDEState *s, uint8_t* buf)
+
+ if (pwrcnd) {
+ /* eject/load only happens for power condition == 0 */
++ ide_atapi_cmd_ok(s);
+ return;
+ }
+
+--
+1.7.0.4
Patch0023: 0023-virtio-net-out-of-bounds-buffer-write-on-load.patch
Patch0024: 0024-virtio-validate-config_len-on-load.patch
+#CVE-2015-5154 related patches. See more information here:
+#https://bugzilla.redhat.com/show_bug.cgi?id=1243563
+Patch0080: CVE-2015-5154.patch
+Patch0081: Clear-DRQ-after-handling-all-expected-accesses.patch
+Patch0082: Fix-START-STOP-UNIT-command-completion.patch
+
BuildRequires: SDL-devel
BuildRequires: zlib-devel
BuildRequires: which
%patch0022 -p1
%patch0023 -p1
%patch0024 -p1
-
+%patch0080 -p1
+%patch0081 -p1
+%patch0082 -p1
%build
%if %{with kvmonly}
Code Review / packages / centos6 / qemu.git / commitdiff