https://github.com/torvalds/linux
Revision 5f74f820f6fc844b95f9e5e406e0a07d97510420 authored by Helge Deller on 13 November 2023, 10:12:57 UTC, committed by Andrew Morton on 15 November 2023, 23:30:09 UTC
Matoro reported various userspace crashes on the parisc platform with kernel
6.6 and bisected it to commit 3033cd430768 ("parisc: Use generic mmap top-down
layout and brk randomization").

That commit switched parisc to use the common infrastructure to calculate
mmap_base, but missed that the mmap_base() function takes care for
architectures where the stack grows downwards only.

Fix the mmap_base() calculation to include the stack-grows-upwards case
and thus fix the userspace crashes on parisc.

Link: https://lkml.kernel.org/r/ZVH2qeS1bG7/1J/l@p100
Fixes: 3033cd430768 ("parisc: Use generic mmap top-down layout and brk randomization")
Signed-off-by: Helge Deller <deller@gmx.de>
Reported-by: matoro <matoro_mailinglist_kernel@matoro.tk>
Tested-by: matoro <matoro_mailinglist_kernel@matoro.tk>
Cc: <stable@vger.kernel.org>	[6.6+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
1 parent 13b2a4b
History
Tip revision: 5f74f820f6fc844b95f9e5e406e0a07d97510420 authored by Helge Deller on 13 November 2023, 10:12:57 UTC
parisc: fix mmap_base calculation when stack grows upwards
Tip revision: 5f74f82
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