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Fix Unix ARM64 RtlRestoreContext implementation - #59831
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The RtlRestoreContext sets SP before reading out PC from the context. That can lead to a corruption of the PC in the context if an async signal is delivered to the thread or the thread is interrupted by any other mean after the SP is set and before the value of PC is extracted from the context. This change fixes it by setting the SP after both PC and SP values are read from the context data structure.
jkotas
reviewed
Sep 30, 2021
| ldr x17, [x16, CONTEXT_Sp] | ||
| mov sp, x17 | ||
| ldr x17, [x16, CONTEXT_Pc] | ||
| ldp x16, x17, [x16, CONTEXT_Sp] // Context_Pc is right after Context_Sp |
jkotas
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Sep 30, 2021
jkotas
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Thank you! I think we should consider this for backport to .NET 6.
jkotas
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Oct 1, 2021
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/backport to release/6.0 |
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Started backporting to release/6.0: https://github.com/dotnet/runtime/actions/runs/1293350876 |
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The RtlRestoreContext sets SP before reading out PC from the
context. That can lead to a corruption of the PC in the context
if an async signal is delivered to the thread or the thread is
interrupted by any other mean after the SP is set and before
the value of PC is extracted from the context.
This change fixes it by setting the SP after both PC and SP values
are read from the context data structure.