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| author | John Baldwin <jhb@FreeBSD.org> | 2020-12-01 17:04:46 +0000 |
|---|---|---|
| committer | John Baldwin <jhb@FreeBSD.org> | 2020-12-01 17:04:46 +0000 |
| commit | 5941edfcdc17ed51b65125c25d3fac632bf4cd81 (patch) | |
| tree | 00430933ed016cdd2ebc8b353c8ae55c32a24a01 /sys/sys | |
| parent | c49747eaf241cb79632dca7308f97fd518d90ec5 (diff) | |
| download | src-test2-5941edfcdc17ed51b65125c25d3fac632bf4cd81.tar.gz src-test2-5941edfcdc17ed51b65125c25d3fac632bf4cd81.zip | |
Add a kstack_contains() helper function.
This is useful for stack unwinders which need to avoid out-of-bounds
reads of a kernel stack which can trigger kernel faults.
Reviewed by: kib, markj
Obtained from: CheriBSD
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D27356
Notes
Notes:
svn path=/head/; revision=368240
Diffstat (limited to 'sys/sys')
| -rw-r--r-- | sys/sys/proc.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/sys/proc.h b/sys/sys/proc.h index 23bac23b5188..0d92dfb7578d 100644 --- a/sys/sys/proc.h +++ b/sys/sys/proc.h @@ -1198,6 +1198,13 @@ curthread_pflags2_restore(int save) curthread->td_pflags2 &= save; } +static __inline bool +kstack_contains(struct thread *td, vm_offset_t va, size_t len) +{ + return (va >= td->td_kstack && va + len >= va && + va + len <= td->td_kstack + td->td_kstack_pages * PAGE_SIZE); +} + static __inline __pure2 struct td_sched * td_get_sched(struct thread *td) { |