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1191117931
PACI*SP have the advantage that they are in HINT space, meaning they can be run successfully in hardware without PAuth support - they will just behave as a NOP. However, PACI*SP are also implicit landing pads (think of an extra BTI jc). Therefore, they allow indirect jumps of all kinds into them, potentially inserting new gadgets. This patch replaces PACI*SP by PACI* LR, SP when compiling explicitly for hardware with full PAuth support. PACI* is not in the HINT space, therefore it will fault when run in hardware without PAuth support, but it is also not a landing pad, making programs safer in newer HW. Differential Revision: https://reviews.llvm.org/D101920
45 lines
1.6 KiB
LLVM
45 lines
1.6 KiB
LLVM
; RUN: llc -mtriple aarch64-arm-none-eabi -enable-machine-outliner \
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; RUN: -verify-machineinstrs %s -o - | FileCheck %s
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@v = common dso_local global i32* null, align 8
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; CHECK-LABEL: foo: // @foo
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; CHECK-NEXT: // %bb.0: // %entry
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; CHECK-NEXT: pacia x30, sp
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; CHECK-NOT: OUTLINED_FUNCTION_
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; CHECK: retaa
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define dso_local void @foo(i32 %x) #0 {
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entry:
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%0 = zext i32 %x to i64
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%vla = alloca i32, i64 %0, align 4
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store volatile i32* %vla, i32** @v, align 8
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store volatile i32* %vla, i32** @v, align 8
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store volatile i32* %vla, i32** @v, align 8
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store volatile i32* %vla, i32** @v, align 8
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store volatile i32* %vla, i32** @v, align 8
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store volatile i32* %vla, i32** @v, align 8
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ret void
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}
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; CHECK-LABEL: bar: // @bar
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; CHECK-NEXT: // %bb.0: // %entry
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; CHECK-NEXT: pacia x30, sp
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; CHECK-NOT: OUTLINED_FUNCTION_
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; CHECK: retaa
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define dso_local void @bar(i32 %x) #0 {
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entry:
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%0 = zext i32 %x to i64
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%vla = alloca i32, i64 %0, align 4
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store volatile i32* null, i32** @v, align 8
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store volatile i32* %vla, i32** @v, align 8
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store volatile i32* %vla, i32** @v, align 8
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store volatile i32* %vla, i32** @v, align 8
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store volatile i32* %vla, i32** @v, align 8
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store volatile i32* %vla, i32** @v, align 8
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ret void
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}
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attributes #0 = { nounwind "target-features"="+v8.3a" "frame-pointer"="all" "sign-return-address"="all" "sign-return-address-key"="a_key" }
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; CHECK-NOT: OUTLINED_FUNCTION_
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