Re: [PATCH v6 3/6] x86/elf: Support a new ELF aux vector AT_MINSIGSTKSZ

[Borislav Petkov <bp@suse.de>]

On Wed, Mar 10, 2021 at 04:34:40PM +0000, Bae, Chang Seok wrote:
> Yeah, right. While this attempts to fix the issue, it involves the ABI change.
> Len and I think PATCH5 [1] is rather a backport candidate as it gives a more
> reasonable behavior.

Yap, patch 5 is more conservative, sure.

I guess I can take it out of the set and send it Linuswards now.

> > That source code needs some special markup to look like source code -
> > currently, the result looks bad.
> 
> How about this code:

No, build the docs by doing

make htmldocs

and look at the result.

Btw, you should always look at the result before sending it out.

> Rewrote like this:
> 
> AT_SYSINFO is used for locating the vsyscall entry point.  It is not exported
> on 64-bit mode.
> 
> AT_SYSINFO_EHDR is the start address of the page containing the vDSO.
> 
> AT_MINSIGSTKSZ denotes the minimum stack size required by the kernel to
> deliver a signal to user-space.  AT_MINSIGSTKSZ comprehends the space consumed
> by the kernel to accommodate the user context for the current hardware
> configuration.  It does not comprehend subsequent user-space stack
> consumption, which must be added by the user.  (e.g. Above, user-space adds
> SIGSTKSZ to AT_MINSIGSTKSZ.)

Better.

Thx.

-- 
Regards/Gruss,
    Boris.

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