CVE-2017-8309: audio: host memory lekage via capture buffer (bz #1446520) CVE-2017-8379: input: host memory lekage via keyboard events (bz #1446560) CVE-2017-8380: scsi: megasas: out-of-bounds read in megasas_mmio_write (bz #1446578) CVE-2017-7493: 9pfs: guest privilege escalation in virtfs mapped-file mode (bz #1451711) CVE-2017-9503: megasas: null pointer dereference while processing megasas command (bz #1459478) CVE-2017-10806: usb-redirect: stack buffer overflow in debug logging (bz #1468497) CVE-2017-9524: nbd: segfault due to client non-negotiation (bz #1460172) CVE-2017-10664: qemu-nbd: server breaks with SIGPIPE upon client abort (bz #1466192)
219 lines
8.8 KiB
Diff
219 lines
8.8 KiB
Diff
From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Thu, 1 Jun 2017 17:23:13 +0200
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Subject: [PATCH] megasas: do not read command more than once from frame
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Avoid TOC-TOU bugs by passing the frame_cmd down, and checking
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cmd->dcmd_opcode instead of cmd->frame->header.frame_cmd.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 36c327a69d723571f02a7691631667cdb1865ee1)
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---
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hw/scsi/megasas.c | 60 +++++++++++++++++++++++--------------------------------
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1 file changed, 25 insertions(+), 35 deletions(-)
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diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
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index a3f75c1650..38e0a2f5ef 100644
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--- a/hw/scsi/megasas.c
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+++ b/hw/scsi/megasas.c
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@@ -1591,12 +1591,13 @@ static int megasas_handle_dcmd(MegasasState *s, MegasasCmd *cmd)
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}
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static int megasas_finish_internal_dcmd(MegasasCmd *cmd,
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- SCSIRequest *req)
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+ SCSIRequest *req, size_t resid)
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{
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int retval = MFI_STAT_OK;
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int lun = req->lun;
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trace_megasas_dcmd_internal_finish(cmd->index, cmd->dcmd_opcode, lun);
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+ cmd->iov_size -= resid;
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switch (cmd->dcmd_opcode) {
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case MFI_DCMD_PD_GET_INFO:
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retval = megasas_pd_get_info_submit(req->dev, lun, cmd);
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@@ -1649,11 +1650,12 @@ static int megasas_enqueue_req(MegasasCmd *cmd, bool is_write)
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}
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static int megasas_handle_scsi(MegasasState *s, MegasasCmd *cmd,
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- bool is_logical)
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+ int frame_cmd)
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{
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uint8_t *cdb;
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bool is_write;
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struct SCSIDevice *sdev = NULL;
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+ bool is_logical = (frame_cmd == MFI_CMD_LD_SCSI_IO);
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cdb = cmd->frame->pass.cdb;
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@@ -1661,7 +1663,7 @@ static int megasas_handle_scsi(MegasasState *s, MegasasCmd *cmd,
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if (cmd->frame->header.target_id >= MFI_MAX_LD ||
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cmd->frame->header.lun_id != 0) {
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trace_megasas_scsi_target_not_present(
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- mfi_frame_desc[cmd->frame->header.frame_cmd], is_logical,
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+ mfi_frame_desc[frame_cmd], is_logical,
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cmd->frame->header.target_id, cmd->frame->header.lun_id);
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return MFI_STAT_DEVICE_NOT_FOUND;
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}
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@@ -1671,19 +1673,20 @@ static int megasas_handle_scsi(MegasasState *s, MegasasCmd *cmd,
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cmd->iov_size = le32_to_cpu(cmd->frame->header.data_len);
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trace_megasas_handle_scsi(mfi_frame_desc[cmd->frame->header.frame_cmd],
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- is_logical, cmd->frame->header.target_id,
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+ trace_megasas_handle_scsi(mfi_frame_desc[frame_cmd], is_logical,
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+ cmd->frame->header.target_id,
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cmd->frame->header.lun_id, sdev, cmd->iov_size);
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if (!sdev || (megasas_is_jbod(s) && is_logical)) {
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trace_megasas_scsi_target_not_present(
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- mfi_frame_desc[cmd->frame->header.frame_cmd], is_logical,
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+ mfi_frame_desc[frame_cmd], is_logical,
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cmd->frame->header.target_id, cmd->frame->header.lun_id);
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return MFI_STAT_DEVICE_NOT_FOUND;
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}
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if (cmd->frame->header.cdb_len > 16) {
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trace_megasas_scsi_invalid_cdb_len(
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- mfi_frame_desc[cmd->frame->header.frame_cmd], is_logical,
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+ mfi_frame_desc[frame_cmd], is_logical,
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cmd->frame->header.target_id, cmd->frame->header.lun_id,
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cmd->frame->header.cdb_len);
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megasas_write_sense(cmd, SENSE_CODE(INVALID_OPCODE));
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@@ -1703,7 +1706,7 @@ static int megasas_handle_scsi(MegasasState *s, MegasasCmd *cmd,
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cmd->frame->header.lun_id, cdb, cmd);
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if (!cmd->req) {
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trace_megasas_scsi_req_alloc_failed(
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- mfi_frame_desc[cmd->frame->header.frame_cmd],
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+ mfi_frame_desc[frame_cmd],
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cmd->frame->header.target_id, cmd->frame->header.lun_id);
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megasas_write_sense(cmd, SENSE_CODE(NO_SENSE));
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cmd->frame->header.scsi_status = BUSY;
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@@ -1725,11 +1728,11 @@ static int megasas_handle_scsi(MegasasState *s, MegasasCmd *cmd,
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return MFI_STAT_INVALID_STATUS;
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}
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-static int megasas_handle_io(MegasasState *s, MegasasCmd *cmd)
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+static int megasas_handle_io(MegasasState *s, MegasasCmd *cmd, int frame_cmd)
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{
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uint32_t lba_count, lba_start_hi, lba_start_lo;
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uint64_t lba_start;
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- bool is_write = (cmd->frame->header.frame_cmd == MFI_CMD_LD_WRITE);
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+ bool is_write = (frame_cmd == MFI_CMD_LD_WRITE);
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uint8_t cdb[16];
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int len;
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struct SCSIDevice *sdev = NULL;
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@@ -1746,20 +1749,20 @@ static int megasas_handle_io(MegasasState *s, MegasasCmd *cmd)
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}
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trace_megasas_handle_io(cmd->index,
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- mfi_frame_desc[cmd->frame->header.frame_cmd],
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+ mfi_frame_desc[frame_cmd],
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cmd->frame->header.target_id,
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cmd->frame->header.lun_id,
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(unsigned long)lba_start, (unsigned long)lba_count);
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if (!sdev) {
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trace_megasas_io_target_not_present(cmd->index,
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- mfi_frame_desc[cmd->frame->header.frame_cmd],
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+ mfi_frame_desc[frame_cmd],
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cmd->frame->header.target_id, cmd->frame->header.lun_id);
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return MFI_STAT_DEVICE_NOT_FOUND;
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}
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if (cmd->frame->header.cdb_len > 16) {
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trace_megasas_scsi_invalid_cdb_len(
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- mfi_frame_desc[cmd->frame->header.frame_cmd], 1,
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+ mfi_frame_desc[frame_cmd], 1,
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cmd->frame->header.target_id, cmd->frame->header.lun_id,
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cmd->frame->header.cdb_len);
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megasas_write_sense(cmd, SENSE_CODE(INVALID_OPCODE));
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@@ -1781,7 +1784,7 @@ static int megasas_handle_io(MegasasState *s, MegasasCmd *cmd)
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cmd->frame->header.lun_id, cdb, cmd);
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if (!cmd->req) {
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trace_megasas_scsi_req_alloc_failed(
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- mfi_frame_desc[cmd->frame->header.frame_cmd],
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+ mfi_frame_desc[frame_cmd],
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cmd->frame->header.target_id, cmd->frame->header.lun_id);
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megasas_write_sense(cmd, SENSE_CODE(NO_SENSE));
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cmd->frame->header.scsi_status = BUSY;
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@@ -1799,23 +1802,11 @@ static int megasas_handle_io(MegasasState *s, MegasasCmd *cmd)
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return MFI_STAT_INVALID_STATUS;
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}
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-static int megasas_finish_internal_command(MegasasCmd *cmd,
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- SCSIRequest *req, size_t resid)
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-{
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- int retval = MFI_STAT_INVALID_CMD;
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-
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- if (cmd->frame->header.frame_cmd == MFI_CMD_DCMD) {
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- cmd->iov_size -= resid;
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- retval = megasas_finish_internal_dcmd(cmd, req);
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- }
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- return retval;
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-}
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-
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static QEMUSGList *megasas_get_sg_list(SCSIRequest *req)
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{
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MegasasCmd *cmd = req->hba_private;
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- if (cmd->frame->header.frame_cmd == MFI_CMD_DCMD) {
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+ if (cmd->dcmd_opcode != -1) {
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return NULL;
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} else {
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return &cmd->qsg;
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@@ -1829,7 +1820,7 @@ static void megasas_xfer_complete(SCSIRequest *req, uint32_t len)
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trace_megasas_io_complete(cmd->index, len);
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- if (cmd->frame->header.frame_cmd != MFI_CMD_DCMD) {
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+ if (cmd->dcmd_opcode != -1) {
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scsi_req_continue(req);
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return;
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}
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@@ -1872,7 +1863,7 @@ static void megasas_command_complete(SCSIRequest *req, uint32_t status,
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/*
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* Internal command complete
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*/
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- cmd_status = megasas_finish_internal_command(cmd, req, resid);
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+ cmd_status = megasas_finish_internal_dcmd(cmd, req, resid);
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if (cmd_status == MFI_STAT_INVALID_STATUS) {
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return;
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}
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@@ -1943,6 +1934,7 @@ static void megasas_handle_frame(MegasasState *s, uint64_t frame_addr,
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{
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uint8_t frame_status = MFI_STAT_INVALID_CMD;
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uint64_t frame_context;
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+ int frame_cmd;
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MegasasCmd *cmd;
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/*
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@@ -1961,7 +1953,8 @@ static void megasas_handle_frame(MegasasState *s, uint64_t frame_addr,
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s->event_count++;
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return;
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}
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- switch (cmd->frame->header.frame_cmd) {
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+ frame_cmd = cmd->frame->header.frame_cmd;
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+ switch (frame_cmd) {
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case MFI_CMD_INIT:
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frame_status = megasas_init_firmware(s, cmd);
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break;
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@@ -1972,18 +1965,15 @@ static void megasas_handle_frame(MegasasState *s, uint64_t frame_addr,
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frame_status = megasas_handle_abort(s, cmd);
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break;
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case MFI_CMD_PD_SCSI_IO:
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- frame_status = megasas_handle_scsi(s, cmd, 0);
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- break;
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case MFI_CMD_LD_SCSI_IO:
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- frame_status = megasas_handle_scsi(s, cmd, 1);
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+ frame_status = megasas_handle_scsi(s, cmd, frame_cmd);
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break;
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case MFI_CMD_LD_READ:
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case MFI_CMD_LD_WRITE:
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- frame_status = megasas_handle_io(s, cmd);
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+ frame_status = megasas_handle_io(s, cmd, frame_cmd);
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break;
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default:
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- trace_megasas_unhandled_frame_cmd(cmd->index,
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- cmd->frame->header.frame_cmd);
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+ trace_megasas_unhandled_frame_cmd(cmd->index, frame_cmd);
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s->event_count++;
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break;
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}
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