diff options
| author | Peter Zijlstra <[email protected]> | 2020-10-27 19:33:30 +0100 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2020-10-27 23:15:24 +0100 |
| commit | cb05143bdf428f280a5d519c82abf196d7871c11 (patch) | |
| tree | 6ef08abfc2e82060af40c487089dc549597949dc /drivers/gpu/drm/drm_dp_mst_topology.c | |
| parent | a195f3d4528a2f88d6f986f6b1101775ad4891cf (diff) | |
x86/debug: Fix DR_STEP vs ptrace_get_debugreg(6)
Commit d53d9bc0cf78 ("x86/debug: Change thread.debugreg6 to
thread.virtual_dr6") changed the semantics of the variable from random
collection of bits, to exactly only those bits that ptrace() needs.
Unfortunately this lost DR_STEP for PTRACE_{BLOCK,SINGLE}STEP.
Furthermore, it turns out that userspace expects DR_STEP to be
unconditionally available, even for manual TF usage outside of
PTRACE_{BLOCK,SINGLE}_STEP.
Fixes: d53d9bc0cf78 ("x86/debug: Change thread.debugreg6 to thread.virtual_dr6")
Reported-by: Kyle Huey <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Kyle Huey <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'drivers/gpu/drm/drm_dp_mst_topology.c')
0 files changed, 0 insertions, 0 deletions