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

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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>
This commit is contained in:
Kirill A. Shutemov 2015-03-24 12:31:40 +10:30 • committed by Rusty Russell
parent 7b63c3ab9b
commit cc9e605dc6
1 changed files with 2 additions and 1 deletions
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3
kernel/module.c
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@ -2494,7 +2494,8 @@ static int copy_module_from_user(const void __user *umod, unsigned long len,
return err; return err;
/* Suck in entire file: we'll want most of it. */ /* 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) if (!info->hdr)
return -ENOMEM; return -ENOMEM;