In the Linux kernel, the following vulnerability has been resolved: arm64: syscall: Ensure saved x0 is kept in-sync with tracer updates When seccomp support was originally added to arm64 in a1ae65b21941 ("arm64: add seccomp support"), seccomp was erroneously called _before_ the ptrace syscall-enter-stop and therefore the tracer could trivially manipulate the syscall register state after the seccomp check had passed. This was subsequently fixed in a5cd110cb836 ("arm64/ptrace: run seccomp after ptrace") by moving the seccomp check after the tracer has run. Unfortunately, a decade later, that fix has been reported to be incomplete. On arm64, both the first argument to a syscall and its eventual return value are allocated to register x0. In order to facilitate syscall restarting and queryin
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