[PATCH 1/5] module: Prevent silent truncation of module name in delete_module(2)

[Petr Pavlu]

Passing a module name longer than MODULE_NAME_LEN to the delete_module
syscall results in its silent truncation. This really isn't much of
a problem in practice, but it could theoretically lead to the removal of an
incorrect module. It is more sensible to return ENAMETOOLONG or ENOENT in
such a case.

Update the syscall to return ENOENT, as documented in the delete_module(2)
man page to mean "No module by that name exists." This is appropriate
because a module with a name longer than MODULE_NAME_LEN cannot be loaded
in the first place.

Signed-off-by: Petr Pavlu <petr.pa...@suse.com>
---
 kernel/module/main.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/kernel/module/main.c b/kernel/module/main.c
index 413ac6ea3702..933a9854cb7d 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -751,14 +751,16 @@ SYSCALL_DEFINE2(delete_module, const char __user *, 
name_user,
        struct module *mod;
        char name[MODULE_NAME_LEN];
        char buf[MODULE_FLAGS_BUF_SIZE];
-       int ret, forced = 0;
+       int ret, len, forced = 0;
 
        if (!capable(CAP_SYS_MODULE) || modules_disabled)
                return -EPERM;
 
-       if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
-               return -EFAULT;
-       name[MODULE_NAME_LEN-1] = '\0';
+       len = strncpy_from_user(name, name_user, MODULE_NAME_LEN);
+       if (len == 0 || len == MODULE_NAME_LEN)
+               return -ENOENT;
+       if (len < 0)
+               return len;
 
        audit_log_kern_module(name);
 
-- 
2.49.0