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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-02-08 15:10:20 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-02-11 23:35:08 +1100 |
| commit | 57fdfbce89137ae85cd5cef48be168040a47dd13 (patch) | |
| tree | 650491d7469237dfcf4d01b68c9cfaa84d9df20e /arch/powerpc/kernel/entry_32.S | |
| parent | powerpc/compat_sys: swap hi/lo parts of 64-bit syscall args in LE mode (diff) | |
| download | linux-dev-57fdfbce89137ae85cd5cef48be168040a47dd13.tar.xz linux-dev-57fdfbce89137ae85cd5cef48be168040a47dd13.zip | |
powerpc/32s: Add missing call to kuep_lock on syscall entry
Userspace Execution protection and fast syscall entry were implemented
independently from each other and were both merged in kernel 5.2,
leading to syscall entry missing userspace execution protection.
On syscall entry, execution of user space memory must be
locked in the same way as on exception entry.
Fixes: b86fb88855ea ("powerpc/32: implement fast entry for syscalls on non BOOKE")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c65e105b63aaf74f91a14f845bc77192350b84a6.1612796617.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index b102b40c4988..b1e36602c013 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -351,6 +351,9 @@ trace_syscall_entry_irq_off: .globl transfer_to_syscall transfer_to_syscall: +#ifdef CONFIG_PPC_BOOK3S_32 + kuep_lock r11, r12 +#endif #ifdef CONFIG_TRACE_IRQFLAGS andi. r12,r9,MSR_EE beq- trace_syscall_entry_irq_off |