diff options
Diffstat (limited to 'Documentation/x86/protection-keys.txt')
| -rw-r--r-- | Documentation/x86/protection-keys.txt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/x86/protection-keys.txt b/Documentation/x86/protection-keys.txt index b64304540821..fa46dcb347bc 100644 --- a/Documentation/x86/protection-keys.txt +++ b/Documentation/x86/protection-keys.txt @@ -34,7 +34,7 @@ with a key. In this example WRPKRU is wrapped by a C function called pkey_set(). int real_prot = PROT_READ|PROT_WRITE; - pkey = pkey_alloc(0, PKEY_DENY_WRITE); + pkey = pkey_alloc(0, PKEY_DISABLE_WRITE); ptr = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); ret = pkey_mprotect(ptr, PAGE_SIZE, real_prot, pkey); ... application runs here @@ -42,9 +42,9 @@ called pkey_set(). Now, if the application needs to update the data at 'ptr', it can gain access, do the update, then remove its write access: - pkey_set(pkey, 0); // clear PKEY_DENY_WRITE + pkey_set(pkey, 0); // clear PKEY_DISABLE_WRITE *ptr = foo; // assign something - pkey_set(pkey, PKEY_DENY_WRITE); // set PKEY_DENY_WRITE again + pkey_set(pkey, PKEY_DISABLE_WRITE); // set PKEY_DISABLE_WRITE again Now when it frees the memory, it will also free the pkey since it is no longer in use: |