Описание
Security update for xen
This update for xen fixes the following issues:
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CVE-2021-28701: Fixed race condition in XENMAPSPACE_grant_table handling (XSA-384) (bsc#1189632).
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CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly (XSA-386) (bsc#1191363).
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CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs (XSA-388) (bsc#1192557).
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CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 (XSA-389) (bsc#1192559).
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CVE-2021-28706: Fixed guests may exceed their designated memory limit (XSA-385) (bsc#1192554).
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Upstream bug fixes (bsc#1027519)
Список пакетов
Image SLES15-SP1-CHOST-BYOS-EC2
Image SLES15-SP1-EC2-HPC-HVM-BYOS
Image SLES15-SP1-EC2-HVM-BYOS
Image SLES15-SP1-SAP-EC2-HVM
Image SLES15-SP1-SAP-EC2-HVM-BYOS
Image SLES15-SP1-SAPCAL-EC2-HVM
SUSE Enterprise Storage 6
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS
SUSE Linux Enterprise Server 15 SP1-BCL
SUSE Linux Enterprise Server 15 SP1-LTSS
SUSE Linux Enterprise Server for SAP Applications 15 SP1
Ссылки
- Link for SUSE-SU-2021:3977-1
- E-Mail link for SUSE-SU-2021:3977-1
- SUSE Security Ratings
- SUSE Bug 1027519
- SUSE Bug 1189632
- SUSE Bug 1191363
- SUSE Bug 1192554
- SUSE Bug 1192557
- SUSE Bug 1192559
- SUSE CVE CVE-2021-28701 page
- SUSE CVE CVE-2021-28702 page
- SUSE CVE CVE-2021-28704 page
- SUSE CVE CVE-2021-28705 page
- SUSE CVE CVE-2021-28706 page
- SUSE CVE CVE-2021-28707 page
- SUSE CVE CVE-2021-28708 page
- SUSE CVE CVE-2021-28709 page
Описание
Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.
Затронутые продукты
Ссылки
- CVE-2021-28701
- SUSE Bug 1189632
Описание
PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.
Затронутые продукты
Ссылки
- CVE-2021-28702
- SUSE Bug 1191363
Описание
PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). The implementation of some of these hypercalls for PoD does not enforce the base page frame number to be suitably aligned for the specified order, yet some code involved in PoD handling actually makes such an assumption. These operations are XENMEM_decrease_reservation (CVE-2021-28704) and XENMEM_populate_physmap (CVE-2021-28707), the latter usable only by domains controlling the guest, i.e. a de-privileged qemu or a stub domain. (Patch 1, combining the fix to both these two issues.) In addition handling of XENMEM_decrease_reservation can also trigger a host crash when the specified page order is neither 4k nor 2M nor 1G (CVE-2021-28708, patch 2).
Затронутые продукты
Ссылки
- CVE-2021-28704
- SUSE Bug 1192557
Описание
issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error handling in certain PoD cases has been insufficient in that in particular partial success of some operations was not properly accounted for. There are two code paths affected - page removal (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix to both issues.)
Затронутые продукты
Ссылки
- CVE-2021-28705
- SUSE Bug 1192559
Описание
guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound.
Затронутые продукты
Ссылки
- CVE-2021-28706
- SUSE Bug 1192554
Описание
PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). The implementation of some of these hypercalls for PoD does not enforce the base page frame number to be suitably aligned for the specified order, yet some code involved in PoD handling actually makes such an assumption. These operations are XENMEM_decrease_reservation (CVE-2021-28704) and XENMEM_populate_physmap (CVE-2021-28707), the latter usable only by domains controlling the guest, i.e. a de-privileged qemu or a stub domain. (Patch 1, combining the fix to both these two issues.) In addition handling of XENMEM_decrease_reservation can also trigger a host crash when the specified page order is neither 4k nor 2M nor 1G (CVE-2021-28708, patch 2).
Затронутые продукты
Ссылки
- CVE-2021-28707
Описание
PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). The implementation of some of these hypercalls for PoD does not enforce the base page frame number to be suitably aligned for the specified order, yet some code involved in PoD handling actually makes such an assumption. These operations are XENMEM_decrease_reservation (CVE-2021-28704) and XENMEM_populate_physmap (CVE-2021-28707), the latter usable only by domains controlling the guest, i.e. a de-privileged qemu or a stub domain. (Patch 1, combining the fix to both these two issues.) In addition handling of XENMEM_decrease_reservation can also trigger a host crash when the specified page order is neither 4k nor 2M nor 1G (CVE-2021-28708, patch 2).
Затронутые продукты
Ссылки
- CVE-2021-28708
Описание
issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error handling in certain PoD cases has been insufficient in that in particular partial success of some operations was not properly accounted for. There are two code paths affected - page removal (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix to both issues.)
Затронутые продукты
Ссылки
- CVE-2021-28709