module: do not print allocation-fail warning on bogus user buffer size

init_module(2) passes user-specified buffer length directly to
vmalloc(). It makes warn_alloc_failed() to print out a lot of info into
dmesg if user specified insane size, like -1.

Let's silence the warning. It doesn't add much value to -ENOMEM return
code. Without the patch the syscall is prohibitive noisy for testing
with trinity.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/kernel/module.c b/kernel/module.c
index 3ab942f..65bd206 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2494,7 +2494,8 @@ static int copy_module_from_user(const void __user *umod, unsigned long len,
                return err;
 
        /* Suck in entire file: we'll want most of it. */
-       info->hdr = vmalloc(info->len);
+       info->hdr = __vmalloc(info->len,
+                       GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN, PAGE_KERNEL);
        if (!info->hdr)
                return -ENOMEM;