sigaltstack(2) manipulates two fields in task_struct; save and restore
these. Without this change the alternate stack is not used after
restart.
Signed-off-by: Nathan Lynch <ntl@xxxxxxxxx>
---
include/linux/checkpoint_hdr.h | 2 ++
kernel/checkpoint/process.c | 6 ++++++
2 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/include/linux/checkpoint_hdr.h b/include/linux/checkpoint_hdr.h
index c8383c0..bc4ef43 100644
--- a/include/linux/checkpoint_hdr.h
+++ b/include/linux/checkpoint_hdr.h
@@ -380,6 +380,8 @@ struct ckpt_hdr_task {
__u64 set_child_tid;
__u64 clear_child_tid;
+ __u64 sas_ss_sp;
+ __u32 sas_ss_size;
} __attribute__((aligned(8)));
/* Posix capabilities */
diff --git a/kernel/checkpoint/process.c b/kernel/checkpoint/process.c
index f6f3771..936675a 100644
--- a/kernel/checkpoint/process.c
+++ b/kernel/checkpoint/process.c
@@ -138,6 +138,9 @@ static int checkpoint_task_struct(struct ckpt_ctx *ctx, struct task_struct *t)
h->exit_state = t->exit_state;
h->exit_code = t->exit_code;
+ h->sas_ss_sp = t->sas_ss_sp;
+ h->sas_ss_size = t->sas_ss_size;
+
if (t->exit_state) {
/* zombie - skip remaining state */
BUG_ON(t->exit_state != EXIT_ZOMBIE);
@@ -542,6 +545,9 @@ static int restore_task_struct(struct ckpt_ctx *ctx)
t->exit_signal = h->exit_signal;
t->pdeath_signal = h->pdeath_signal;
+ t->sas_ss_sp = (unsigned long)h->sas_ss_sp;
+ t->sas_ss_size = h->sas_ss_size;
+
t->set_child_tid =
(int __user *) (unsigned long) h->set_child_tid;
t->clear_child_tid =
--
1.7.1.1
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