qemu-all: fix CVE-2015-3456
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d2ec15ed5ad82e6bf0eb90bb9c27b656 CVE-3456.diff
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2fab3ea4460de9b57192e5b8b311f221 qemu-2.3.0.tar.bz2
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qemu-all/CVE-3456.diff
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81
qemu-all/CVE-3456.diff
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From: Petr Matousek <pmatouse@redhat.com>
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Date: Wed, 6 May 2015 07:48:59 +0000 (+0200)
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Subject: fdc: force the fifo access to be in bounds of the allocated buffer
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X-Git-Url: http://git.qemu.org/?p=qemu.git;a=commitdiff_plain;h=e907746266721f305d67bc0718795fedee2e824c
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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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Signed-off-by: John Snow <jsnow@redhat.com>
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---
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diff --git a/hw/block/fdc.c b/hw/block/fdc.c
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index f72a392..d8a8edd 100644
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--- a/hw/block/fdc.c
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+++ b/hw/block/fdc.c
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@@ -1497,7 +1497,7 @@ static uint32_t fdctrl_read_data(FDCtrl *fdctrl)
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{
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FDrive *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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@@ -1506,8 +1506,8 @@ static uint32_t fdctrl_read_data(FDCtrl *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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@@ -1852,10 +1852,13 @@ static void fdctrl_handle_option(FDCtrl *fdctrl, int direction)
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static void fdctrl_handle_drive_specification_command(FDCtrl *fdctrl, int direction)
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{
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FDrive *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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@@ -1955,7 +1958,7 @@ static uint8_t command_to_handler[256];
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static void fdctrl_write_data(FDCtrl *fdctrl, uint32_t value)
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{
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FDrive *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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@@ -2004,7 +2007,9 @@ static void fdctrl_write_data(FDCtrl *fdctrl, uint32_t value)
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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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@ -7,12 +7,15 @@
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name=qemu-all
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version=2.3.0
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release=1
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source=(http://wiki.qemu.org/download/qemu-$version.tar.bz2)
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release=2
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source=(http://wiki.qemu.org/download/qemu-$version.tar.bz2
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CVE-3456.diff)
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build() {
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cd qemu-$version
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patch -p1 -i $SRC/CVE-3456.diff
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./configure --prefix=/usr \
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--cc="${CC:=gcc}" \
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