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linux-stable/arch/powerpc
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Christophe Leroy d93f9e2374 powerpc/32s: Fix kuap_kernel_restore() 
At interrupt exit, kuap_kernel_restore() calls kuap_unlock() with the
value contained in regs->kuap. However, when regs->kuap contains
0xffffffff it means that KUAP was not unlocked so calling kuap_unlock()
is unrelevant and results in jeopardising the contents of kernel space
segment registers.

So check that regs->kuap doesn't contain KUAP_NONE before calling
kuap_unlock(). In the meantime it also means that if KUAP has not
been correcly locked back at interrupt exit, it must be locked
before continuing. This is done by checking the content of
current->thread.kuap which was returned by kuap_get_and_assert_locked()

Fixes: 16132529ce ("powerpc/32s: Rework Kernel Userspace Access Protection")
Reported-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/0d0c4d0f050a637052287c09ba521bad960a2790.1631715131.git.christophe.leroy@csgroup.eu
2021-10-07 23:34:00 +11:00
..
boot powerpc/boot: Fix build failure since GCC 4.9 removal 2021-09-14 08:33:32 -07:00
configs powerpc/configs/microwatt: Enable options for systemd 2021-08-27 00:56:53 +10:00
crypto crypto: powepc/sha1 - remove unneeded semicolon 2021-03-07 15:13:14 +11:00
include powerpc/32s: Fix kuap_kernel_restore() 2021-10-07 23:34:00 +11:00
kernel powerpc/64s: Fix unrecoverable MCE calling async handler from NMI 2021-10-07 19:54:55 +11:00
kexec powerpc updates for 5.15 2021-09-03 11:22:50 -07:00
kvm KVM: PPC: Book3S HV: Tolerate treclaim. in fake-suspend mode changing registers 2021-09-13 22:34:12 +10:00
lib powerpc/lib: Add helper to check if offset is within conditional branch range 2021-10-07 18:52:33 +11:00
math-emu powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
mm Merge branch 'akpm' (patches from Andrew) 2021-09-08 12:55:35 -07:00
net powerpc/bpf ppc32: Fix BPF_SUB when imm == 0x80000000 2021-10-07 19:52:59 +11:00
perf powerpc/perf: Fix the check for SIAR value 2021-08-25 22:38:19 +10:00
platforms powerpc/pseries/msi: Add an empty irq_write_msi_msg() handler 2021-10-07 23:33:25 +11:00
purgatory powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S 2021-04-08 21:17:43 +10:00
sysdev powerpc/xics: Set the IRQ chip data for the ICS native backend 2021-09-15 22:05:53 +10:00
tools powerpc/head_check: Fix shellcheck errors 2021-08-17 22:52:02 +10:00
xmon powerpc: Refactor verification of MSR_RI 2021-08-26 21:21:07 +10:00
Kbuild
Kconfig Tracing updates for 5.15: 2021-09-05 11:50:41 -07:00
Kconfig.debug powerpc/ptdump: Convert powerpc to GENERIC_PTDUMP 2021-08-25 13:35:48 +10:00
Makefile powerpc: Add "-z notext" flag to disable diagnostic 2021-08-15 13:49:39 +10:00
Makefile.postlink