ARM: 8148/1: flush TLS and thumbee register state during exec
The TPIDRURO and TPIDRURW registers need to be flushed during exec; otherwise TLS information is potentially leaked. TPIDRURO in particular needs careful treatment. Since flush_thread basically needs the same code used to set the TLS in arm_syscall, pull that into a common set_tls helper in tls.h and use it in both places. Similarly, TEEHBR needs to be cleared during exec as well. Clearing its save slot in thread_info isn't right as there is no guarantee that a thread switch will occur before the new program runs. Just setting the register directly is sufficient. Signed-off-by: NNathan Lynch <nathan_lynch@mentor.com> Acked-by: NWill Deacon <will.deacon@arm.com> Cc: <stable@vger.kernel.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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