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Christophe Leroy c4e3ff8b8b powerpc/32: Fix hardlockup on vmap stack overflow

commit 5bb60ea611 upstream.

Since the commit c118c7303a ("powerpc/32: Fix vmap stack - Do not
activate MMU before reading task struct") a vmap stack overflow
results in a hard lockup. This is because emergency_ctx is still
addressed with its virtual address allthough data MMU is not active
anymore at that time.

Fix it by using a physical address instead.

Fixes: c118c7303a ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct")
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ce30364fb7ccda489272af4a1612b6aa147e1d23.1637227521.git.christophe.leroy@csgroup.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2021-12-01 09:04:44 +01:00

alpha

…

arc

signal: Replace force_sigsegv(SIGSEGV) with force_fatal_sig(SIGSEGV)

2021-11-25 09:49:06 +01:00

arm

kmap_local: don't assume kmap PTEs are linear arrays in memory

2021-11-25 09:48:43 +01:00

arm64

arm64: mm: Fix VM_BUG_ON(mm != &init_mm) for trans_pgd

2021-12-01 09:04:43 +01:00