linux-kernel - Re: [PATCH 1/1] Additional strict check on ELF file. Checks segments are followed in order of 'p_vaddr ' value ascending. It fixes erorr in total_mapping_size with computation total size. This error happens if segments in ELF file are not in order.

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Message-Id: <AD3CF79A-0AFC-4447-BBC7-8EA5F036B623@gmail.com>
Date:   Tue, 27 Feb 2018 15:45:34 +0300
From:   Ilya Smith <blackzert@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Additional strict check on ELF file. Checks segments
 are followed in order of 'p_vaddr ' value ascending. It fixes erorr in
 total_mapping_size with computation total size. This error happens if
 segments in ELF file are not in order.

Thanks for that, I will fix it in next patch. Any other feedback?

Thanks,
Ilya

> 26 февр. 2018 г., в 20:48, Randy Dunlap <rdunlap@...radead.org> написал(а):
> 
> On 02/26/2018 07:46 AM, Ilya Smith wrote:
>> Signed-off-by: Ilya Smith <blackzert@...il.com>
>> ---
>> fs/binfmt_elf.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 51 insertions(+)
>> 
>> diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
>> index bdb201230bae..970b42044240 100644
>> --- a/fs/binfmt_elf.c
>> +++ b/fs/binfmt_elf.c
>> @@ -524,6 +524,52 @@ static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp,
>> 
>> #endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */
>> 
>> +/**
>> + * elf_check_phdr() - common check ELF program header.
>> + * @phdr: The program header to check
>> + * @phdr_num: Count of program headers in @phdr from elf header.
>> + *
>> + * Checks ELF binary meets specification.
>> + *
>> + * Return: Zero to proceed with ELF load, non-zero to faile the ELF load
> 
>                                                         fail
> 
>> + *		   with that return code.
>> + */
>> +static int elf_check_phdr(struct elf_phdr *phdr, unsigned long phdr_num)
>> +{
> 
> And it would be nicer/better to have all of the "intro" text in the body of this
> message instead of in another email.
> 
> thanks,
> -- 
> ~Randy