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arm64: entry.S: Add ventry overflow sanity checks

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commit 4330e2c5c0 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>
This commit is contained in:
James Morse
2021-11-17 15:15:26 +00:00
committed by Greg Kroah-Hartman
parent 97d8bdf331
commit dc5b630c0d
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/kernel/entry.S
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@@ -62,6 +62,7 @@
.macro kernel_ventry, el, label, regsize = 64
.align 7
.Lventry_start\@:
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
.if \el == 0
alternative_if ARM64_UNMAP_KERNEL_AT_EL0
@@ -120,6 +121,7 @@ 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
@@ -832,6 +834,7 @@ 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