MIRRORS/linux-yocto
1
0
Fork 0
mirror of git://git.yoctoproject.org/linux-yocto.git synced 2025-10-23 07:23:12 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity
3bd6137220
linux-yocto/tools/testing
History
Thomas Weißschuh 3bd6137220 selftests/mm: virtual_address_range: avoid reading from VM_IO mappings 
The virtual_address_range selftest reads from the start of each mapping
listed in /proc/self/maps.  However not all mappings are valid to be
arbitrarily accessed.

For example the vvar data used for virtual clocks on x86 [vvar_vclock] can
only be accessed if 1) the kernel configuration enables virtual clocks and
2) the hypervisor provided the data for it.  Only the VDSO itself has the
necessary information to know this.  Since commit e93d2521b2 ("x86/vdso:
Split virtual clock pages into dedicated mapping") the virtual clock data
was split out into its own mapping, leading to EFAULT from read() during
the validation.

Check for the VM_IO flag as a proxy.  It is present for the VVAR mappings
and MMIO ranges can be dangerous to access arbitrarily.

Link: https://lkml.kernel.org/r/20250114-virtual_address_range-tests-v4-4-6fd7269934a5@linutronix.de
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202412271148.2656e485-lkp@intel.com
Fixes: e93d2521b2 ("x86/vdso: Split virtual clock pages into dedicated mapping")
Fixes: 0104096498 ("selftests/mm: confirm VA exhaustion without reliance on correctness of mmap()")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Suggested-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/lkml/e97c2a5d-c815-4936-a767-ac42a3220a90@redhat.com/
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Shuah Khan (Samsung OSG) <shuah@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-01-25 20:22:44 -08:00
..
crypto/chacha20-s390
cxl module: Convert symbol namespace to string literal 2024-12-02 11:34:44 -08:00
fault-injection failcmd: make failcmd.sh executable 2024-09-01 20:43:32 -07:00
ktest ktest.pl: Avoid false positives with grub2 skip regex 2024-09-04 15:06:28 -04:00
kunit kunit: configs: remove configs for DAMON debugfs interface tests 2025-01-25 20:22:29 -08:00
memblock memblock: updates for 6.12-rc1 2024-09-25 11:35:19 -07:00
nvdimm Get rid of 'remove_new' relic from platform driver struct 2024-12-01 15:12:43 -08:00
radix-tree maple_tree: add some alloc node test case 2024-11-06 20:11:13 -08:00
scatterlist
selftests selftests/mm: virtual_address_range: avoid reading from VM_IO mappings 2025-01-25 20:22:44 -08:00
shared tools: fix atomic_set() definition to set the value correctly 2025-01-12 19:03:35 -08:00
vma mm: make mmap_region() internal 2025-01-25 20:22:38 -08:00
vsock vsock/test: verify socket options after setting them 2024-12-05 11:39:34 +01:00