linux-kernel - Link time manipulation of kernel symbols like read/write

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Message-ID: <y2gf22d86811005071051q28a4fa84g2a3ea1a7ff487934@mail.gmail.com>
Date:	Fri, 7 May 2010 23:21:00 +0530
From:	"Leonidas ." <leonidas137@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Link time manipulation of kernel symbols like read/write

Hi folks,

Is it possible to wrap module entry points like open/close during the
module compilation?
By wrapping, I mean interposing using linker --wrap option. This is
very much possible in
user space and is commonly used to interpose library functions.

E.g.

void *
__wrap_malloc (int c)
{
  printf ("malloc called with %ld\n", c);
  return __real_malloc (c);
}

int main()
{
    malloc(17);
    return 0;
}

Above works expected, can we wrap kmalloc this way?

-Leo.
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