Re: [PATCH 2/2] dlfcn,elf: implement dlmem() function [BZ #11767]

[stsp <stsp2@yandex.ru>]

Hi,

14.02.2023 14:51, Florian Weimer пишет:
> * Stas Sergeev via Libc-alpha:
>
>> This patch adds the following function:
>> void *dlmem(const unsigned char *buffer, size_t size, int flags);
>>
>> It is the same as dlopen() but allows to dynamic-link solibs from
>> the memory buffer, rather than from a file as dlopen() does.
>>
>> "buffer" arg is the pointer to the solib image in memory.
>> "size" is the solib image size. Must be smaller-or-equal to the
>> actual buffer size.
>> "flags" is the same flags argument used in dlopen().
>>
>> The idea behind the implementation is very simple: where the
>> dlopen() would mmap() the file, dlmem() does anonymous
>> mmap()+memcpy().
> With the mandatory copy, I'm not sure if this is a substantial
> improvement over the pedestrian implementation using memfd_create,

Hope the need/features of my dlmem()
impl was explained since then.
But now I posted v9 that uses memcpy()
only as an opt-in, not by default. Unfortunately
I haven't made it to work on kernels older
than 5.13, so on those it still falls back to
memcpy().
Are there any other things left to implement?