Revision eb35bdd7bca29a13c8ecd44e6fd747a84ce675db authored by Will Deacon on 11 September 2014, 13:38:16 UTC, committed by Will Deacon on 11 September 2014, 17:34:58 UTC
Nathan reports that we leak TLS information from the parent context
during an exec, as we don't clear the TLS registers when flushing the
thread state.

This patch updates the flushing code so that we:

  (1) Unconditionally zero the tpidr_el0 register (since this is fully
      context switched for native tasks and zeroed for compat tasks)

  (2) Zero the tp_value state in thread_info before clearing the
      tpidrr0_el0 register for compat tasks (since this is only writable
      by the set_tls compat syscall and therefore not fully switched).

A missing compiler barrier is also added to the compat set_tls syscall.

Cc: <stable@vger.kernel.org>
Acked-by: Nathan Lynch <Nathan_Lynch@mentor.com>
Reported-by: Nathan Lynch <Nathan_Lynch@mentor.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
1 parent 3d8afe3
Raw File
exthdrs_offload.c
/*
 *	IPV6 GSO/GRO offload support
 *	Linux INET6 implementation
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 *      IPV6 Extension Header GSO/GRO support
 */
#include <net/protocol.h>
#include "ip6_offload.h"

static const struct net_offload rthdr_offload = {
	.flags		=	INET6_PROTO_GSO_EXTHDR,
};

static const struct net_offload dstopt_offload = {
	.flags		=	INET6_PROTO_GSO_EXTHDR,
};

int __init ipv6_exthdrs_offload_init(void)
{
	int ret;

	ret = inet6_add_offload(&rthdr_offload, IPPROTO_ROUTING);
	if (ret)
		goto out;

	ret = inet6_add_offload(&dstopt_offload, IPPROTO_DSTOPTS);
	if (ret)
		goto out_rt;

out:
	return ret;

out_rt:
	inet_del_offload(&rthdr_offload, IPPROTO_ROUTING);
	goto out;
}
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