The following commit has been merged into the sched/core branch of tip: Commit-ID: 8da3d9b8590bc178752d4b72938745e9a6c4c416 Gitweb: https://git.kernel.org/tip/8da3d9b8590bc178752d4b72938745e9a6c4c416 Author: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> AuthorDate: Wed, 22 Jun 2022 15:46:17 -04:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Sat, 30 Jul 2022 10:14:18 +02:00 rseq: Kill process when unknown flags are encountered in ABI structures rseq_abi()->flags and rseq_abi()->rseq_cs->flags 29 upper bits are currently unused. The current behavior when those bits are set is to ignore them. This is not an ideal behavior, because when future features will start using those flags, if user-space fails to correctly validate that the kernel indeed supports those flags (e.g. with a new sys_rseq flags bit) before using them, it may incorrectly assume that the kernel will handle those flags way when in fact those will be silently ignored on older kernels. Validating that unused flags bits are cleared will allow a smoother transition when those flags will start to be used by allowing applications to fail early, and obviously, when they attempt to use the new flags on an older kernel that does not support them. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Link: https://lkml.kernel.org/r/20220622194617.1155957-2-mathieu.desnoyers@xxxxxxxxxxxx --- kernel/rseq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/rseq.c b/kernel/rseq.c index 81d7dc8..bda8175 100644 --- a/kernel/rseq.c +++ b/kernel/rseq.c @@ -176,7 +176,7 @@ static int rseq_need_restart(struct task_struct *t, u32 cs_flags) u32 flags, event_mask; int ret; - if (WARN_ON_ONCE(cs_flags & RSEQ_CS_NO_RESTART_FLAGS)) + if (WARN_ON_ONCE(cs_flags & RSEQ_CS_NO_RESTART_FLAGS) || cs_flags) return -EINVAL; /* Get thread flags. */ @@ -184,7 +184,7 @@ static int rseq_need_restart(struct task_struct *t, u32 cs_flags) if (ret) return ret; - if (WARN_ON_ONCE(flags & RSEQ_CS_NO_RESTART_FLAGS)) + if (WARN_ON_ONCE(flags & RSEQ_CS_NO_RESTART_FLAGS) || flags) return -EINVAL; /*
![]() |