linux-kernel - Re: [PATCH 2/2] remoteproc: use filesz as backup when translate memsz fail

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 9 Apr 2020 18:22:26 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Peng Fan <peng.fan@....com>
Cc:     ohad@...ery.com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-imx@....com
Subject: Re: [PATCH 2/2] remoteproc: use filesz as backup when translate
 memsz fail

On Thu 09 Apr 01:22 PDT 2020, Peng Fan wrote:

> Since we no need memset if memsz is larger than filesz, we could
> use filesz for the da to va translation when memsz translation fail.
> 

To me this implies that the firmware has a segment that's larger than
the memory that it's going to run in. I think even if we're not writing
to the entire memsz, asking da_to_va for the entire memsz provides a
valuable sanity check.

Regards,
Bjorn

> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/remoteproc/remoteproc_elf_loader.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
> index cc50fe70d50c..74d425a4b34c 100644
> --- a/drivers/remoteproc/remoteproc_elf_loader.c
> +++ b/drivers/remoteproc/remoteproc_elf_loader.c
> @@ -229,8 +229,16 @@ int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
>  		if (!ptr) {
>  			dev_err(dev, "bad phdr da 0x%llx mem 0x%llx\n", da,
>  				memsz);
> -			ret = -EINVAL;
> -			break;
> +
> +			ptr = rproc_da_to_va(rproc, da, filesz);
> +			if (!ptr) {
> +				dev_err(dev,
> +					"bad phdr da 0x%llx mem 0x%llx\n",
> +					da, filesz);
> +				ret = -EINVAL;
> +				break;
> +			}
> +
>  		}
>  
>  		/* put the segment where the remote processor expects it */
> -- 
> 2.16.4
>