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 <[email protected]> --- 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 _______________________________________________ Containers mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/containers _______________________________________________ Devel mailing list [email protected] https://openvz.org/mailman/listinfo/devel
