powerpc/security: Use a mutex for interrupt exit code patching

The mitigation-patching.sh script in the powerpc selftests toggles
all mitigations on and off simultaneously, revealing that rfi_flush
and stf_barrier cannot safely operate at the same time due to races
in updating the static key.

On some systems, the static key code throws a warning and the kernel
remains functional.  On others, the kernel will hang or crash.

Fix this by slapping on a mutex.

Fixes: 13799748b957 ("powerpc/64: use interrupt restart table to speed up return from interrupt")
Cc: stable@vger.kernel.org # v5.14+
Signed-off-by: Russell Currey <ruscur@russell.cc>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211027072410.40950-1-ruscur@russell.cc

diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c
index cda17be..c3e0692 100644 (file)
--- a/arch/powerpc/lib/feature-fixups.c
+++ b/arch/powerpc/lib/feature-fixups.c
@@ -228,6 +228,7 @@ static void do_stf_exit_barrier_fixups(enum stf_barrier_type types)
 
 static bool stf_exit_reentrant = false;
 static bool rfi_exit_reentrant = false;
+static DEFINE_MUTEX(exit_flush_lock);
 
 static int __do_stf_barrier_fixups(void *data)
 {
@@ -253,6 +254,9 @@ void do_stf_barrier_fixups(enum stf_barrier_type types)
         * low level interrupt exit code before patching. After the patching,
         * if allowed, then flip the branch to allow fast exits.
         */
+
+       // Prevent static key update races with do_rfi_flush_fixups()
+       mutex_lock(&exit_flush_lock);
        static_branch_enable(&interrupt_exit_not_reentrant);
 
        stop_machine(__do_stf_barrier_fixups, &types, NULL);
@@ -264,6 +268,8 @@ void do_stf_barrier_fixups(enum stf_barrier_type types)
 
        if (stf_exit_reentrant && rfi_exit_reentrant)
                static_branch_disable(&interrupt_exit_not_reentrant);
+
+       mutex_unlock(&exit_flush_lock);
 }
 
 void do_uaccess_flush_fixups(enum l1d_flush_type types)
@@ -486,6 +492,9 @@ void do_rfi_flush_fixups(enum l1d_flush_type types)
         * without stop_machine, so this could be achieved with a broadcast
         * IPI instead, but this matches the stf sequence.
         */
+
+       // Prevent static key update races with do_stf_barrier_fixups()
+       mutex_lock(&exit_flush_lock);
        static_branch_enable(&interrupt_exit_not_reentrant);
 
        stop_machine(__do_rfi_flush_fixups, &types, NULL);
@@ -497,6 +506,8 @@ void do_rfi_flush_fixups(enum l1d_flush_type types)
 
        if (stf_exit_reentrant && rfi_exit_reentrant)
                static_branch_disable(&interrupt_exit_not_reentrant);
+
+       mutex_unlock(&exit_flush_lock);
 }
 
 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)