Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1267290

Re: [PATCH v2] livepatch: x86: bugfix about kASLR

Show all headers | View raw

On Fri, Nov 06, 2015 at 02:25:00PM +0800, Zhou Chengming wrote:
> When enable KASLR, livepatch will adjust old_addr of changed
> function accordingly. So do the same thing for reloc.
> 
> [PATCH v1] https://lkml.org/lkml/2015/11/4/91
> 
> Reported-by: Cyril B. <cbay@alwaysdata.com>
> Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com>
> ---
>  kernel/livepatch/core.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
> index 6e53441..db545cb 100644
> --- a/kernel/livepatch/core.c
> +++ b/kernel/livepatch/core.c
> @@ -294,6 +294,12 @@ static int klp_write_object_relocations(struct module *pmod,
>  
>  	for (reloc = obj->relocs; reloc->name; reloc++) {
>  		if (!klp_is_module(obj)) {
> +
> +#if defined(CONFIG_RANDOMIZE_BASE)
> +			/* If KASLR has been enabled, adjust old value accordingly */
> +			if (kaslr_enabled())
> +				reloc->val += kaslr_offset();
> +#endif
>  			ret = klp_verify_vmlinux_symbol(reloc->name,
>  							reloc->val);
>  			if (ret)

Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v2] livepatch: x86: bugfix about kASLR Zhou Chengming <zhouchengming1@huawei.com> - 2015-11-06 07:40 +0100
  Re: [PATCH v2] livepatch: x86: bugfix about kASLR Josh Poimboeuf <jpoimboe@redhat.com> - 2015-11-10 15:10 +0100
    Re: [PATCH v2] livepatch: x86: bugfix about kASLR Minfei Huang <mnfhuang@gmail.com> - 2015-11-11 09:50 +0100
      Re: [PATCH v2] livepatch: x86: bugfix about kASLR Josh Poimboeuf <jpoimboe@redhat.com> - 2015-11-11 17:20 +0100
        Re: [PATCH v2] livepatch: x86: bugfix about kASLR Josh Poimboeuf <jpoimboe@redhat.com> - 2015-11-11 17:30 +0100
        Re: [PATCH v2] livepatch: x86: bugfix about kASLR Jiri Kosina <jikos@kernel.org> - 2015-11-11 17:30 +0100
  Re: [PATCH v2] livepatch: x86: bugfix about kASLR Josh Poimboeuf <jpoimboe@redhat.com> - 2015-11-11 17:30 +0100
  Re: [PATCH v2] livepatch: x86: bugfix about kASLR Jiri Kosina <jikos@kernel.org> - 2015-11-11 17:50 +0100

csiph-web