2668ab806b
XEN_DOMCTL_gettscinfo (XSA-132) 5535f633-dont-leak-hypervisor-stack-to-toolstacks.patch - bnc#929339 - VUL-0: CVE-2015-3456: qemu kvm xen: VENOM qemu floppy driver host code execution CVE-2015-3456-xsa133-qemuu.patch CVE-2015-3456-xsa133-qemut.patch OBS-URL: https://build.opensuse.org/package/show/Virtualization/xen?expand=0&rev=362
81 lines
2.8 KiB
Diff
81 lines
2.8 KiB
Diff
From ac7ddbe342d7aa2303c39ca731cc6229dbbd739b Mon Sep 17 00:00:00 2001
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From: Petr Matousek <pmatouse@redhat.com>
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Date: Wed, 6 May 2015 09:48:59 +0200
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Subject: [PATCH] fdc: force the fifo access to be in bounds of the allocated buffer
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During processing of certain commands such as FD_CMD_READ_ID and
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FD_CMD_DRIVE_SPECIFICATION_COMMAND the fifo memory access could
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get out of bounds leading to memory corruption with values coming
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from the guest.
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Fix this by making sure that the index is always bounded by the
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allocated memory.
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This is CVE-2015-3456.
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Signed-off-by: Petr Matousek <pmatouse@redhat.com>
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Reviewed-by: John Snow <jsnow@redhat.com>
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---
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hw/block/fdc.c | 17 +++++++++++------
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1 file changed, 11 insertions(+), 6 deletions(-)
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Index: xen-4.2.5-testing/tools/qemu-xen-traditional-dir-remote/hw/fdc.c
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===================================================================
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--- xen-4.2.5-testing.orig/tools/qemu-xen-traditional-dir-remote/hw/fdc.c
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+++ xen-4.2.5-testing/tools/qemu-xen-traditional-dir-remote/hw/fdc.c
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@@ -1318,7 +1318,7 @@ static uint32_t fdctrl_read_data (fdctrl
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{
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fdrive_t *cur_drv;
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uint32_t retval = 0;
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- int pos;
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+ uint32_t pos;
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cur_drv = get_cur_drv(fdctrl);
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fdctrl->dsr &= ~FD_DSR_PWRDOWN;
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@@ -1327,8 +1327,8 @@ static uint32_t fdctrl_read_data (fdctrl
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return 0;
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}
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pos = fdctrl->data_pos;
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+ pos %= FD_SECTOR_LEN;
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if (fdctrl->msr & FD_MSR_NONDMA) {
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- pos %= FD_SECTOR_LEN;
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if (pos == 0) {
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if (fdctrl->data_pos != 0)
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if (!fdctrl_seek_to_next_sect(fdctrl, cur_drv)) {
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@@ -1673,10 +1673,13 @@ static void fdctrl_handle_option (fdctrl
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static void fdctrl_handle_drive_specification_command (fdctrl_t *fdctrl, int direction)
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{
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fdrive_t *cur_drv = get_cur_drv(fdctrl);
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+ uint32_t pos;
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- if (fdctrl->fifo[fdctrl->data_pos - 1] & 0x80) {
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+ pos = fdctrl->data_pos - 1;
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+ pos %= FD_SECTOR_LEN;
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+ if (fdctrl->fifo[pos] & 0x80) {
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/* Command parameters done */
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- if (fdctrl->fifo[fdctrl->data_pos - 1] & 0x40) {
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+ if (fdctrl->fifo[pos] & 0x40) {
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fdctrl->fifo[0] = fdctrl->fifo[1];
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fdctrl->fifo[2] = 0;
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fdctrl->fifo[3] = 0;
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@@ -1771,7 +1774,7 @@ static uint8_t command_to_handler[256];
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static void fdctrl_write_data (fdctrl_t *fdctrl, uint32_t value)
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{
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fdrive_t *cur_drv;
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- int pos;
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+ uint32_t pos;
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/* Reset mode */
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if (!(fdctrl->dor & FD_DOR_nRESET)) {
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@@ -1817,7 +1820,9 @@ static void fdctrl_write_data (fdctrl_t
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}
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FLOPPY_DPRINTF("%s: %02x\n", __func__, value);
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- fdctrl->fifo[fdctrl->data_pos++] = value;
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+ pos = fdctrl->data_pos++;
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+ pos %= FD_SECTOR_LEN;
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+ fdctrl->fifo[pos] = value;
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if (fdctrl->data_pos == fdctrl->data_len) {
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/* We now have all parameters
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* and will be able to treat the command
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