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From: Kees Cook <kees@kernel.org>
To: stable@vger.kernel.org, Dominique Martinet <asmadeus@codewreck.org>
Subject: please revert backport of 44c76825d6eefee9eb7ce06c38e1a6632ac7eb7d
Date: Thu, 21 Nov 2024 06:33:18 -0800	[thread overview]
Message-ID: <202411210628.ECF1B494D7@keescook> (raw)

Hi stable tree maintainers,

Please revert the backports of

44c76825d6ee ("x86: Increase brk randomness entropy for 64-bit systems")

namely:

5.4:  03475167fda50b8511ef620a27409b08365882e1
5.10: 25d31baf922c1ee987efd6fcc9c7d4ab539c66b4
5.15: 06cb3463aa58906cfff72877eb7f50cb26e9ca93
6.1:  b0cde867b80a5e81fcbc0383e138f5845f2005ee
6.6:  1a45994fb218d93dec48a3a86f68283db61e0936

There seems to be a bad interaction between this change and older
PIE-built qemu-user-static (for aarch64) binaries[1]. Investigation
continues to see if this will need to be reverted from 6.6, 6.11,
and mainline. But for now, it's clearly a problem for older kernels with
older qemu.

Thanks!

-Kees

[1] https://lore.kernel.org/all/202411201000.F3313C02@keescook/

-- 
Kees Cook

             reply	other threads:[~2024-11-21 14:33 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-11-21 14:33 Kees Cook [this message]
2024-11-25  7:26 ` please revert backport of 44c76825d6eefee9eb7ce06c38e1a6632ac7eb7d Michael Tokarev
2024-12-05  6:54   ` Salvatore Bonaccorso
2024-12-05  7:07     ` Greg KH
2024-12-05  7:22       ` Salvatore Bonaccorso
2024-12-05  7:35         ` Michael Tokarev
2024-12-06 12:04           ` Dominique Martinet

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