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SUSE:SLE-12-SP2:GA
xen.3265
CVE-2015-6855-qemuu-ide-divide-by-zero-issue.patch
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File CVE-2015-6855-qemuu-ide-divide-by-zero-issue.patch of Package xen.3265
References: bsc#965156 CVE-2015-6855 Subject: ide: fix ATAPI command permissions From: John Snow jsnow@redhat.com Thu Sep 17 14:17:05 2015 -0400 Date: Fri Sep 18 10:58:56 2015 -0400: Git: d9033e1d3aa666c5071580617a57bd853c5d794a We're a little too lenient with what we'll let an ATAPI drive handle. Clamp down on the IDE command execution table to remove CD_OK permissions from commands that are not and have never been ATAPI commands. For ATAPI command validity, please see: - ATA4 Section 6.5 ("PACKET Command feature set") - ATA8/ACS Section 4.3 ("The PACKET feature set") - ACS3 Section 4.3 ("The PACKET feature set") ACS3 has a historical command validity table in Table B.4 ("Historical Command Assignments") that can be referenced to find when a command was introduced, deprecated, obsoleted, etc. The only reference for ATAPI command validity is by checking that version's PACKET feature set section. ATAPI was introduced by T13 into ATA4, all commands retired prior to ATA4 therefore are assumed to have never been ATAPI commands. Mandatory commands, as listed in ATA8-ACS3, are: - DEVICE RESET - EXECUTE DEVICE DIAGNOSTIC - IDENTIFY DEVICE - IDENTIFY PACKET DEVICE - NOP - PACKET - READ SECTOR(S) - SET FEATURES Optional commands as listed in ATA8-ACS3, are: - FLUSH CACHE - READ LOG DMA EXT - READ LOG EXT - WRITE LOG DMA EXT - WRITE LOG EXT All other commands are illegal to send to an ATAPI device and should be rejected by the device. CD_OK removal justifications: 0x06 WIN_DSM Defined in ACS2. Not valid for ATAPI. 0x21 WIN_READ_ONCE Retired in ATA5. Not ATAPI in ATA4. 0x94 WIN_STANDBYNOW2 Retired in ATA4. Did not coexist with ATAPI. 0x95 WIN_IDLEIMMEDIATE2 Retired in ATA4. Did not coexist with ATAPI. 0x96 WIN_STANDBY2 Retired in ATA4. Did not coexist with ATAPI. 0x97 WIN_SETIDLE2 Retired in ATA4. Did not coexist with ATAPI. 0x98 WIN_CHECKPOWERMODE2 Retired in ATA4. Did not coexist with ATAPI. 0x99 WIN_SLEEPNOW2 Retired in ATA4. Did not coexist with ATAPI. 0xE0 WIN_STANDBYNOW1 Not part of ATAPI in ATA4, ACS or ACS3. 0xE1 WIN_IDLEIMMDIATE Not part of ATAPI in ATA4, ACS or ACS3. 0xE2 WIN_STANDBY Not part of ATAPI in ATA4, ACS or ACS3. 0xE3 WIN_SETIDLE1 Not part of ATAPI in ATA4, ACS or ACS3. 0xE4 WIN_CHECKPOWERMODE1 Not part of ATAPI in ATA4, ACS or ACS3. 0xE5 WIN_SLEEPNOW1 Not part of ATAPI in ATA4, ACS or ACS3. 0xF8 WIN_READ_NATIVE_MAX Obsoleted in ACS3. Not ATAPI in ATA4 or ACS. This patch fixes a divide by zero fault that can be caused by sending the WIN_READ_NATIVE_MAX command to an ATAPI drive, which causes it to attempt to use zeroed CHS values to perform sector arithmetic. Reported-by: Qinghao Tang <luodalongde@gmail.com> Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Message-id: 1441816082-21031-1-git-send-email-jsnow@redhat.com CC: qemu-stable@nongnu.org Index: xen-4.4.4-testing/tools/qemu-xen-dir-remote/hw/ide/core.c =================================================================== --- xen-4.4.4-testing.orig/tools/qemu-xen-dir-remote/hw/ide/core.c +++ xen-4.4.4-testing/tools/qemu-xen-dir-remote/hw/ide/core.c @@ -1638,11 +1638,11 @@ static const struct { } ide_cmd_table[0x100] = { /* NOP not implemented, mandatory for CD */ [CFA_REQ_EXT_ERROR_CODE] = { cmd_cfa_req_ext_error_code, CFA_OK }, - [WIN_DSM] = { cmd_data_set_management, ALL_OK }, + [WIN_DSM] = { cmd_data_set_management, HD_CFA_OK }, [WIN_DEVICE_RESET] = { cmd_device_reset, CD_OK }, [WIN_RECAL] = { cmd_nop, HD_CFA_OK | SET_DSC}, [WIN_READ] = { cmd_read_pio, ALL_OK }, - [WIN_READ_ONCE] = { cmd_read_pio, ALL_OK }, + [WIN_READ_ONCE] = { cmd_read_pio, HD_CFA_OK }, [WIN_READ_EXT] = { cmd_read_pio, HD_CFA_OK }, [WIN_READDMA_EXT] = { cmd_read_dma, HD_CFA_OK }, [WIN_READ_NATIVE_MAX_EXT] = { cmd_read_native_max, HD_CFA_OK | SET_DSC }, @@ -1661,12 +1661,12 @@ static const struct { [CFA_TRANSLATE_SECTOR] = { cmd_cfa_translate_sector, CFA_OK }, [WIN_DIAGNOSE] = { cmd_exec_dev_diagnostic, ALL_OK }, [WIN_SPECIFY] = { cmd_nop, HD_CFA_OK | SET_DSC }, - [WIN_STANDBYNOW2] = { cmd_nop, ALL_OK }, - [WIN_IDLEIMMEDIATE2] = { cmd_nop, ALL_OK }, - [WIN_STANDBY2] = { cmd_nop, ALL_OK }, - [WIN_SETIDLE2] = { cmd_nop, ALL_OK }, - [WIN_CHECKPOWERMODE2] = { cmd_check_power_mode, ALL_OK | SET_DSC }, - [WIN_SLEEPNOW2] = { cmd_nop, ALL_OK }, + [WIN_STANDBYNOW2] = { cmd_nop, HD_CFA_OK }, + [WIN_IDLEIMMEDIATE2] = { cmd_nop, HD_CFA_OK }, + [WIN_STANDBY2] = { cmd_nop, HD_CFA_OK }, + [WIN_SETIDLE2] = { cmd_nop, HD_CFA_OK }, + [WIN_CHECKPOWERMODE2] = { cmd_check_power_mode, HD_CFA_OK | SET_DSC }, + [WIN_SLEEPNOW2] = { cmd_nop, HD_CFA_OK }, [WIN_PACKETCMD] = { cmd_packet, CD_OK }, [WIN_PIDENTIFY] = { cmd_identify_packet, CD_OK }, [WIN_SMART] = { cmd_smart, HD_CFA_OK | SET_DSC }, @@ -1680,19 +1680,19 @@ static const struct { [WIN_WRITEDMA] = { cmd_write_dma, HD_CFA_OK }, [WIN_WRITEDMA_ONCE] = { cmd_write_dma, HD_CFA_OK }, [CFA_WRITE_MULTI_WO_ERASE] = { cmd_write_multiple, CFA_OK }, - [WIN_STANDBYNOW1] = { cmd_nop, ALL_OK }, - [WIN_IDLEIMMEDIATE] = { cmd_nop, ALL_OK }, - [WIN_STANDBY] = { cmd_nop, ALL_OK }, - [WIN_SETIDLE1] = { cmd_nop, ALL_OK }, - [WIN_CHECKPOWERMODE1] = { cmd_check_power_mode, ALL_OK | SET_DSC }, - [WIN_SLEEPNOW1] = { cmd_nop, ALL_OK }, + [WIN_STANDBYNOW1] = { cmd_nop, HD_CFA_OK }, + [WIN_IDLEIMMEDIATE] = { cmd_nop, HD_CFA_OK }, + [WIN_STANDBY] = { cmd_nop, HD_CFA_OK }, + [WIN_SETIDLE1] = { cmd_nop, HD_CFA_OK }, + [WIN_CHECKPOWERMODE1] = { cmd_check_power_mode, HD_CFA_OK | SET_DSC }, + [WIN_SLEEPNOW1] = { cmd_nop, HD_CFA_OK }, [WIN_FLUSH_CACHE] = { cmd_flush_cache, ALL_OK }, [WIN_FLUSH_CACHE_EXT] = { cmd_flush_cache, HD_CFA_OK }, [WIN_IDENTIFY] = { cmd_identify, ALL_OK }, [WIN_SETFEATURES] = { cmd_set_features, ALL_OK | SET_DSC }, [IBM_SENSE_CONDITION] = { cmd_ibm_sense_condition, CFA_OK | SET_DSC }, [CFA_WEAR_LEVEL] = { cmd_cfa_erase_sectors, HD_CFA_OK | SET_DSC }, - [WIN_READ_NATIVE_MAX] = { cmd_read_native_max, ALL_OK | SET_DSC }, + [WIN_READ_NATIVE_MAX] = { cmd_read_native_max, HD_CFA_OK | SET_DSC }, }; static bool ide_cmd_permitted(IDEState *s, uint32_t cmd)
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