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Date: Thu, 31 Mar 2022 19:33:42 +0100 From: James Morse <james.morse@....com> To: stable@...r.kernel.org, linux-kernel@...r.kernel.org Cc: james.morse@....com, catalin.marinas@....com Subject: [stable:PATCH v4.14.274 09/27] arm64: entry.S: Add ventry overflow sanity checks commit 4330e2c5c04c27bebf89d34e0bc14e6943413067 upstream. Subsequent patches add even more code to the ventry slots. Ensure kernels that overflow a ventry slot don't get built. Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk> Reviewed-by: Catalin Marinas <catalin.marinas@....com> Signed-off-by: James Morse <james.morse@....com> --- arch/arm64/kernel/entry.S | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index c1ffa95c0ad2..81069ad43a5e 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -74,6 +74,7 @@ .macro kernel_ventry, el, label, regsize = 64 .align 7 +.Lventry_start\@: #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 alternative_if ARM64_UNMAP_KERNEL_AT_EL0 .if \el == 0 @@ -131,6 +132,7 @@ alternative_else_nop_endif mrs x0, tpidrro_el0 #endif b el\()\el\()_\label +.org .Lventry_start\@ + 128 // Did we overflow the ventry slot? .endm .macro tramp_alias, dst, sym @@ -1036,6 +1038,7 @@ alternative_insn isb, nop, ARM64_WORKAROUND_QCOM_FALKOR_E1003 add x30, x30, #(1b - tramp_vectors) isb ret +.org 1b + 128 // Did we overflow the ventry slot? .endm .macro tramp_exit, regsize = 64 -- 2.30.2
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