unix sockets allows to send file descriptors via SCM_RIGHTS type messages.
Each such send call forces kernel to allocate up to 2Kb memory for
struct scm_fp_list.
It makes sense to account for them to restrict the host's memory
consumption from inside the memcg-limited container.
Signed-off-by: Vasily Averin <vvs@xxxxxxxxxxxxx>
---
net/core/scm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/core/scm.c b/net/core/scm.c
index 8156d4f..e837e4f 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -79,7 +79,7 @@ static int scm_fp_copy(struct cmsghdr *cmsg, struct scm_fp_list **fplp)
if (!fpl)
{
- fpl = kmalloc(sizeof(struct scm_fp_list), GFP_KERNEL);
+ fpl = kmalloc(sizeof(struct scm_fp_list), GFP_KERNEL_ACCOUNT);
if (!fpl)
return -ENOMEM;
*fplp = fpl;
@@ -348,7 +348,7 @@ struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl)
return NULL;
new_fpl = kmemdup(fpl, offsetof(struct scm_fp_list, fp[fpl->count]),
- GFP_KERNEL);
+ GFP_KERNEL_ACCOUNT);
if (new_fpl) {
for (i = 0; i < fpl->count; i++)
get_file(fpl->fp[i]);
--
1.8.3.1
