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| author | Kirill A. Shutemov <[email protected]> | 2023-03-12 11:26:01 +0000 |
|---|---|---|
| committer | Dave Hansen <[email protected]> | 2023-03-16 20:08:39 +0000 |
| commit | 74c228d20a51ddb1354409fdbed7b72427339d7b (patch) | |
| tree | 524713f7708b7ffd19da588b367a19796503c04f /fs/proc/array.c | |
| parent | mm: Introduce untagged_addr_remote() (diff) | |
| download | kernel-74c228d20a51ddb1354409fdbed7b72427339d7b.tar.gz kernel-74c228d20a51ddb1354409fdbed7b72427339d7b.zip | |
x86/uaccess: Provide untagged_addr() and remove tags before address check
untagged_addr() is a helper used by the core-mm to strip tag bits and
get the address to the canonical shape based on rules of the current
thread. It only handles userspace addresses.
The untagging mask is stored in per-CPU variable and set on context
switching to the task.
The tags must not be included into check whether it's okay to access the
userspace address. Strip tags in access_ok().
Signed-off-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Tested-by: Alexander Potapenko <[email protected]>
Link: https://lore.kernel.org/all/20230312112612.31869-7-kirill.shutemov%40linux.intel.com
Diffstat (limited to 'fs/proc/array.c')
0 files changed, 0 insertions, 0 deletions