diff options
| -rw-r--r-- | security/keys/keyctl.c | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index d9ca15c109cc..8ec84326a983 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -19,6 +19,7 @@ #include <linux/capability.h> #include <linux/string.h> #include <linux/err.h> +#include <linux/vmalloc.h> #include <asm/uaccess.h> #include "internal.h" @@ -62,9 +63,10 @@ asmlinkage long sys_add_key(const char __user *_type, char type[32], *description; void *payload; long ret; + bool vm; ret = -EINVAL; - if (plen > 32767) + if (plen > 1024 * 1024 - 1) goto error; /* draw all the data into kernel space */ @@ -81,11 +83,18 @@ asmlinkage long sys_add_key(const char __user *_type, /* pull the payload in if one was supplied */ payload = NULL; + vm = false; if (_payload) { ret = -ENOMEM; payload = kmalloc(plen, GFP_KERNEL); - if (!payload) - goto error2; + if (!payload) { + if (plen <= PAGE_SIZE) + goto error2; + vm = true; + payload = vmalloc(plen); + if (!payload) + goto error2; + } ret = -EFAULT; if (copy_from_user(payload, _payload, plen) != 0) @@ -113,7 +122,10 @@ asmlinkage long sys_add_key(const char __user *_type, key_ref_put(keyring_ref); error3: - kfree(payload); + if (!vm) + kfree(payload); + else + vfree(payload); error2: kfree(description); error: @@ -821,9 +833,10 @@ long keyctl_instantiate_key(key_serial_t id, key_ref_t keyring_ref; void *payload; long ret; + bool vm = false; ret = -EINVAL; - if (plen > 32767) + if (plen > 1024 * 1024 - 1) goto error; /* the appropriate instantiation authorisation key must have been @@ -843,8 +856,14 @@ long keyctl_instantiate_key(key_serial_t id, if (_payload) { ret = -ENOMEM; payload = kmalloc(plen, GFP_KERNEL); - if (!payload) - goto error; + if (!payload) { + if (plen <= PAGE_SIZE) + goto error; + vm = true; + payload = vmalloc(plen); + if (!payload) + goto error; + } ret = -EFAULT; if (copy_from_user(payload, _payload, plen) != 0) @@ -877,7 +896,10 @@ long keyctl_instantiate_key(key_serial_t id, } error2: - kfree(payload); + if (!vm) + kfree(payload); + else + vfree(payload); error: return ret; |