ARM: 8148/1: flush TLS and thumbee register state during exec

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commit fbfb872f5f upstream.

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: Nathan Lynch <nathan_lynch@mentor.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Nathan Lynch 2014-09-11 02:49:08 +01:00 • committed by Greg Kroah-Hartman

parent 7c2fbe441d

commit d164cc67d0

4 changed files with 66 additions and 17 deletions

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62

arch/arm/include/asm/tls.h

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2

arch/arm/kernel/process.c

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2

arch/arm/kernel/thumbee.c

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17

arch/arm/kernel/traps.c

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