[CRIU] [PATCH 2/7] Skip generating iov for non PROT_READ region

[Abhishek Dubey]

skip iov-generation corresponding to regions
not having PROT_READ, since process_vm_readv
syscall can't process them during pre-dumping
in "read" mode.

Signed-off-by: Abhishek Dubey <dubeyabhishek777 at gmail.com>
---
 criu/mem.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/criu/mem.c b/criu/mem.c
index e19688d..740992d 100644
--- a/criu/mem.c
+++ b/criu/mem.c
@@ -351,7 +351,7 @@ static int generate_vma_iovs(struct pstree_item *item, struct vma_area *vma,
 			     struct page_pipe *pp, struct page_xfer *xfer,
 			     struct parasite_dump_pages_args *args,
 			     struct parasite_ctl *ctl, pmc_t *pmc,
-			     bool has_parent, bool pre_dump)
+			     bool has_parent, struct mem_dump_ctl *mdc)
 {
 	u64 off = 0;
 	u64 *map;
@@ -361,8 +361,15 @@ static int generate_vma_iovs(struct pstree_item *item, struct vma_area *vma,
 				!vma_area_is(vma, VMA_ANON_SHARED))
 		return 0;
 
+	if (!(vma->e->prot & PROT_READ)) {
+		if (mdc->pre_dump == PRE_DUMP_READ)
+			return 0;
+		if (!mdc->pre_dump)
+			has_parent = false;
+	}
+
 	if (vma_entry_is(vma->e, VMA_AREA_AIORING)) {
-		if (pre_dump)
+		if (mdc->pre_dump)
 			return 0;
 		has_parent = false;
 	}
@@ -474,7 +481,7 @@ static int __parasite_dump_pages_seized(struct pstree_item *item,
 	has_parent = !!xfer.parent && !possible_pid_reuse;
 	list_for_each_entry(vma_area, &vma_area_list->h, list) {
 		ret = generate_vma_iovs(item, vma_area, pp, &xfer, args, ctl,
-					&pmc, has_parent, mdc->pre_dump);
+					&pmc, has_parent, mdc);
 		if (ret < 0)
 			goto out_xfer;
 	}
-- 
2.7.4