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-rw-r--r--include/linux/secretmem.h6
-rw-r--r--kernel/power/hibernate.c5
-rw-r--r--mm/secretmem.c15
3 files changed, 25 insertions, 1 deletions
diff --git a/include/linux/secretmem.h b/include/linux/secretmem.h
index 70e7db9f94fe..907a6734059c 100644
--- a/include/linux/secretmem.h
+++ b/include/linux/secretmem.h
@@ -6,6 +6,7 @@
bool vma_is_secretmem(struct vm_area_struct *vma);
bool page_is_secretmem(struct page *page);
+bool secretmem_active(void);
#else
@@ -19,6 +20,11 @@ static inline bool page_is_secretmem(struct page *page)
return false;
}
+static inline bool secretmem_active(void)
+{
+ return false;
+}
+
#endif /* CONFIG_SECRETMEM */
#endif /* _LINUX_SECRETMEM_H */
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index da0b41914177..559acef3fddb 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -31,6 +31,7 @@
#include <linux/genhd.h>
#include <linux/ktime.h>
#include <linux/security.h>
+#include <linux/secretmem.h>
#include <trace/events/power.h>
#include "power.h"
@@ -81,7 +82,9 @@ void hibernate_release(void)
bool hibernation_available(void)
{
- return nohibernate == 0 && !security_locked_down(LOCKDOWN_HIBERNATION);
+ return nohibernate == 0 &&
+ !security_locked_down(LOCKDOWN_HIBERNATION) &&
+ !secretmem_active();
}
/**
diff --git a/mm/secretmem.c b/mm/secretmem.c
index 2390901d3ff7..7236f4d9458a 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -45,6 +45,13 @@ struct secretmem_ctx {
static struct cma *secretmem_cma;
+static atomic_t secretmem_users;
+
+bool secretmem_active(void)
+{
+ return !!atomic_read(&secretmem_users);
+}
+
static int secretmem_account_pages(struct page *page, gfp_t gfp, int order)
{
int err;
@@ -179,6 +186,12 @@ static const struct vm_operations_struct secretmem_vm_ops = {
.fault = secretmem_fault,
};
+static int secretmem_release(struct inode *inode, struct file *file)
+{
+ atomic_dec(&secretmem_users);
+ return 0;
+}
+
static int secretmem_mmap(struct file *file, struct vm_area_struct *vma)
{
unsigned long len = vma->vm_end - vma->vm_start;
@@ -201,6 +214,7 @@ bool vma_is_secretmem(struct vm_area_struct *vma)
}
static const struct file_operations secretmem_fops = {
+ .release = secretmem_release,
.mmap = secretmem_mmap,
};
@@ -318,6 +332,7 @@ SYSCALL_DEFINE1(memfd_secret, unsigned long, flags)
file->f_flags |= O_LARGEFILE;
fd_install(fd, file);
+ atomic_inc(&secretmem_users);
return fd;
err_put_fd: