Messages in this thread | | | Subject | Re: [PATCH] printk: hash addresses printed with %p | From | Joe Perches <> | Date | Tue, 10 Oct 2017 21:06:50 -0700 |
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On Wed, 2017-10-11 at 14:48 +1100, Tobin C. Harding wrote: > Currently there are many places in the kernel where addresses are being > printed using an unadorned %p. Kernel pointers should be printed using > %pK allowing some control via the kptr_restrict sysctl. Exposing addresses > gives attackers sensitive information about the kernel layout in memory. [] > diff --git a/lib/vsprintf.c b/lib/vsprintf.c [] > @@ -1591,6 +1591,35 @@ char *device_node_string(char *buf, char *end, struct device_node *dn, > return widen_string(buf, buf - buf_start, end, spec); > } > > +static long get_random_odd_long(void) > +{ > + long val = 0; > + > + while((val & 1) == 0) { > + val = get_random_long(); > + } > + > + return val; > +}
Perhaps
static long get_random_odd_long(void) { return get_random_long() | 1L; }
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