forked from Minki/linux
kasan: arm64: set TCR_EL1.TBID1 when enabled
On hardware supporting pointer authentication, we previously ended up enabling TBI on instruction accesses when tag-based ASAN was enabled, but this was costing us 8 bits of PAC entropy, which was unnecessary since tag-based ASAN does not require TBI on instruction accesses. Get them back by setting TCR_EL1.TBID1. Signed-off-by: Peter Collingbourne <pcc@google.com> Reviewed-by: Andrey Konovalov <andreyknvl@google.com> Link: https://linux-review.googlesource.com/id/I3dded7824be2e70ea64df0aabab9598d5aebfcc4 Link: https://lore.kernel.org/r/20f64e26fc8a1309caa446fffcb1b4e2fe9e229f.1605952129.git.pcc@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -260,6 +260,7 @@
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#define TCR_TBI1 (UL(1) << 38)
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#define TCR_HA (UL(1) << 39)
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#define TCR_HD (UL(1) << 40)
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#define TCR_TBID1 (UL(1) << 52)
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#define TCR_NFD0 (UL(1) << 53)
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#define TCR_NFD1 (UL(1) << 54)
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#define TCR_E0PD0 (UL(1) << 55)
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@ -40,7 +40,7 @@
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#define TCR_CACHE_FLAGS TCR_IRGN_WBWA | TCR_ORGN_WBWA
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#ifdef CONFIG_KASAN_SW_TAGS
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#define TCR_KASAN_FLAGS TCR_TBI1
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#define TCR_KASAN_FLAGS TCR_TBI1 | TCR_TBID1
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#else
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#define TCR_KASAN_FLAGS 0
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#endif
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