[PATCH] add kernel log when allocate a new virtual mapping failed because of overcommit
From: Xu Huijie <hidden>
Date: 2021-06-30 07:44:42
Subsystem:
memory management, memory mapping, the rest · Maintainers:
Andrew Morton, Liam R. Howlett, Lorenzo Stoakes, Linus Torvalds
From: xuhuijie <redacted>
diff --git a/mm/mmap.c b/mm/mmap.c
index aa9de981b..f019fc6b2 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c@@ -1758,8 +1758,10 @@ unsigned long mmap_region(struct file *file, unsigned long addr, */ if (accountable_mapping(file, vm_flags)) { charged = len >> PAGE_SHIFT; - if (security_vm_enough_memory_mm(mm, charged)) + if (security_vm_enough_memory_mm(mm, charged)) { + pr_err("Unable to allocate a new virtual mapping because of the overcommit\n"); return -ENOMEM; + } vm_flags |= VM_ACCOUNT; }
--
2.23.0