Messages in this thread | | | Subject | Re: Oops (request_key_auth_describe) while running cve-2016-7042 from LTP | From | Sachin Sant <> | Date | Fri, 30 Aug 2019 16:02:03 +0530 |
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> On 30-Aug-2019, at 2:26 PM, Hillf Danton <hdanton@sina.com> wrote: > > > On Fri, 30 Aug 2019 12:18:07 +0530 Sachin Sant wrote: >> >> [ 8074.351033] BUG: Kernel NULL pointer dereference at 0x00000038 >> [ 8074.351046] Faulting instruction address: 0xc0000000004ddf30 >> [ 8074.351052] Oops: Kernel access of bad area, sig: 11 [#1] >> [ 8074.351056] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries > > Add rcu gp. > > --- a/security/keys/request_key_auth.c > +++ b/security/keys/request_key_auth.c > @@ -64,12 +64,19 @@ static int request_key_auth_instantiate( > static void request_key_auth_describe(const struct key *key, > struct seq_file *m) > { > - struct request_key_auth *rka = dereference_key_rcu(key); > + struct request_key_auth *rka; > + > + rcu_read_lock(); > + rka = dereference_key_rcu(key); > + if (!rka) > + goto out; >
Thanks for the patch. Works for me. Test ran fine without any problems.
Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Thanks -Sachin
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