| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.16 17/53] arm64: entry.S: Add ventry overflow sanity checks | Date | Thu, 10 Mar 2022 15:09:22 +0100 |
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From: James Morse <james.morse@arm.com>
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@armlinux.org.uk> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/arm64/kernel/entry.S | 3 +++ 1 file changed, 3 insertions(+)
--- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -37,6 +37,7 @@ .macro kernel_ventry, el:req, ht:req, regsize:req, label:req .align 7 +.Lventry_start\@: #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 .if \el == 0 alternative_if ARM64_UNMAP_KERNEL_AT_EL0 @@ -95,6 +96,7 @@ alternative_else_nop_endif mrs x0, tpidrro_el0 #endif b el\el\ht\()_\regsize\()_\label +.org .Lventry_start\@ + 128 // Did we overflow the ventry slot? .endm .macro tramp_alias, dst, sym @@ -662,6 +664,7 @@ alternative_else_nop_endif add x30, x30, #(1b - tramp_vectors) isb ret +.org 1b + 128 // Did we overflow the ventry slot? .endm .macro tramp_exit, regsize = 64
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