linux-kernel - Re: [PATCH v7 00/10] livepatch: klp-convert tool

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Date:   Fri, 31 Mar 2023 11:58:20 -0400
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, Josh Poimboeuf <jpoimboe@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Marcos Paulo de Souza <mpdesouza@...e.com>
Subject: Re: [PATCH v7 00/10] livepatch: klp-convert tool

On 3/30/23 08:10, Alexey Dobriyan wrote:
> Joe Lawrence wrote:
>> +static int update_strtab(struct elf *elf)
>> +{
>>
>> +	buf = malloc(new_size);
>> +	if (!buf) {
>> +		WARN("malloc failed");
>> +		return -1;
>> +	}
>> +	memcpy(buf, (void *)strtab->data, orig_size);
> 
> This code is called realloc(). :-)
> 
>> +static int write_file(struct elf *elf, const char *file)
>> +{
>>
>> +	fd = creat(file, 0664);
>> +	e = elf_begin(fd, ELF_C_WRITE, NULL);
> 
> elf_end() doesn't close descriptor, so there is potentially corrupted
> data. There is no unlink() call if writes fail as well.
> 
>> +void elf_close(struct elf *elf)
>> +{
>> +
>> +	if (elf->fd > 0)
>> +		close(elf->fd);
> 
> Techically, it is "fd >= 0".
> 
>> +filechk_klp_map = \
>> +	echo "klp-convert-symbol-data.0.1";		\
>> +	echo "*vmlinux";				\
>> +	$(NM) -f posix vmlinux | cut -d\  -f1;		\
>> +	sort $(MODORDER) $(MODULES_LIVEPATCH) |		\
> 
> This probably should be "LC_ALL=C sort" for speed and reproducibility (?).
> 

Thanks, will incorporate these into the next version.

-- 
Joe