diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2020-10-27 19:33:30 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-10-27 23:15:24 +0100 |
| commit | cb05143bdf428f280a5d519c82abf196d7871c11 (patch) | |
| tree | 6ef08abfc2e82060af40c487089dc549597949dc /net/l2tp | |
| 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 <me@kylehuey.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Kyle Huey <me@kylehuey.com>
Link: https://lore.kernel.org/r/20201027183330.GM2628@hirez.programming.kicks-ass.net
Diffstat (limited to 'net/l2tp')
0 files changed, 0 insertions, 0 deletions