summaryrefslogtreecommitdiff
path: root/include/linux/sched.h
diff options
context:
space:
mode:
authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>2022-11-22 15:39:05 -0500
committerPeter Zijlstra <peterz@infradead.org>2022-12-27 12:52:10 +0100
commitee3e3ac05c2631ce1f12d88c9cc9a092f8fe947a (patch)
treee0c6d2672012d5e85edf1b6d633c27d34aec3382 /include/linux/sched.h
parent317c8194e6aeb8b3b573ad139fc2a0635856498e (diff)
rseq: Introduce extensible rseq ABI
Introduce the extensible rseq ABI, where the feature size supported by the kernel and the required alignment are communicated to user-space through ELF auxiliary vectors. This allows user-space to call rseq registration with a rseq_len of either 32 bytes for the original struct rseq size (which includes padding), or larger. If rseq_len is larger than 32 bytes, then it must be large enough to contain the feature size communicated to user-space through ELF auxiliary vectors. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20221122203932.231377-4-mathieu.desnoyers@efficios.com
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 853d08f7562b..e0bc020a63a9 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1302,6 +1302,7 @@ struct task_struct {
#ifdef CONFIG_RSEQ
struct rseq __user *rseq;
+ u32 rseq_len;
u32 rseq_sig;
/*
* RmW on rseq_event_mask must be performed atomically
@@ -2352,10 +2353,12 @@ static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
{
if (clone_flags & CLONE_VM) {
t->rseq = NULL;
+ t->rseq_len = 0;
t->rseq_sig = 0;
t->rseq_event_mask = 0;
} else {
t->rseq = current->rseq;
+ t->rseq_len = current->rseq_len;
t->rseq_sig = current->rseq_sig;
t->rseq_event_mask = current->rseq_event_mask;
}
@@ -2364,6 +2367,7 @@ static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
static inline void rseq_execve(struct task_struct *t)
{
t->rseq = NULL;
+ t->rseq_len = 0;
t->rseq_sig = 0;
t->rseq_event_mask = 0;
}