Re: [PATCH] powerpc/32s: Fix module loading failure when VMALLOC_END is over 0xf0000000

[Andreas Schwab]

On Aug 21 2020, Christophe Leroy wrote:

> In is_module_segment(), when VMALLOC_END is over 0xf0000000,
> ALIGN(VMALLOC_END, SZ_256M) has value 0.
>
> In that case, addr >= ALIGN(VMALLOC_END, SZ_256M) is always
> true then is_module_segment() always returns false.
>
> Use (ALIGN(VMALLOC_END, SZ_256M) - 1) which will have
> value 0xffffffff and will be suitable for the comparison.
>
> Reported-by: Andreas Schwab <schwab@xxxxxxxxxxxxxx>
> Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
> Fixes: c49643319715 ("powerpc/32s: Only leave NX unset on segments used for modules")

Thanks, that fixes the crash.

Tested-by: Andreas Schwab <schwab@xxxxxxxxxxxxxx>

Andreas.

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