diff options
| author | Nathan Lynch <nathan_lynch@mentor.com> | 2014-09-11 02:49:08 +0100 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-10-13 15:41:07 +0200 |
| commit | 3443c6fd1de2485cbd3e94ac35e54586a8ecc69f (patch) | |
| tree | a21a9b94f871cedc5d9680f31e5f22b65d144820 /arch/arm/kernel/thumbee.c | |
| parent | 132f8be98a83c38b1c63a8962ce63c31e28fd763 (diff) | |
ARM: 8148/1: flush TLS and thumbee register state during exec
commit fbfb872f5f417cea48760c535e0ff027c88b507a 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: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'arch/arm/kernel/thumbee.c')
| -rw-r--r-- | arch/arm/kernel/thumbee.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/kernel/thumbee.c b/arch/arm/kernel/thumbee.c index 7b8403b76666..80f0d69205e7 100644 --- a/arch/arm/kernel/thumbee.c +++ b/arch/arm/kernel/thumbee.c @@ -45,7 +45,7 @@ static int thumbee_notifier(struct notifier_block *self, unsigned long cmd, void switch (cmd) { case THREAD_NOTIFY_FLUSH: - thread->thumbee_state = 0; + teehbr_write(0); break; case THREAD_NOTIFY_SWITCH: current_thread_info()->thumbee_state = teehbr_read(); |