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| author |   Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2023-04-03 14:10:20 +0300 |
|---|---|---|
| committer |   Dave Hansen <dave.hansen@linux.intel.com> | 2023-04-06 13:45:06 -0700 |
| commit | 97740266de26e5dfe6e4fbecacb6995b66c2e378 (patch) | |
| tree | c57cf73b3ee45b7874d93def94f1fed909d6da92 /tools/testing/selftests/x86 | |
| parent | x86/mm/iommu/sva: Fix error code for LAM enabling failure due to SVA (diff) | |
| download | wireguard-linux-97740266de26e5dfe6e4fbecacb6995b66c2e378.tar.xz wireguard-linux-97740266de26e5dfe6e4fbecacb6995b66c2e378.zip | |
x86/mm/iommu/sva: Do not allow to set FORCE_TAGGED_SVA bit from outside
arch_prctl(ARCH_FORCE_TAGGED_SVA) overrides the default and allows LAM
and SVA to co-exist in the process. It is expected by called by the
process when it knows what it is doing.
arch_prctl() operates on the current process, but the same code is
reachable from ptrace where it can be called on arbitrary task.
Make it strict and only allow to set MM_CONTEXT_FORCE_TAGGED_SVA for the
current process.
Fixes: 23e5d9ec2bab ("x86/mm/iommu/sva: Make LAM and SVA mutually exclusive")
Suggested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Link: https://lore.kernel.org/all/20230403111020.3136-3-kirill.shutemov%40linux.intel.com
Diffstat (limited to 'tools/testing/selftests/x86')
0 files changed, 0 insertions, 0 deletions