[PATCH 3.10 26/71] MIPS: OCTEON: make get_system_type() thread-safe

From: Greg Kroah-Hartman
Date: Mon Sep 15 2014 - 16:01:11 EST


3.10-stable review patch. If anyone has any objections, please let me know.

------------------

From: Aaro Koskinen <aaro.koskinen@xxxxxxx>

commit 608308682addfdc7b8e2aee88f0e028331d88e4d upstream.

get_system_type() is not thread-safe on OCTEON. It uses static data,
also more dangerous issue is that it's calling cvmx_fuse_read_byte()
every time without any synchronization. Currently it's possible to get
processes stuck looping forever in kernel simply by launching multiple
readers of /proc/cpuinfo:

(while true; do cat /proc/cpuinfo > /dev/null; done) &
(while true; do cat /proc/cpuinfo > /dev/null; done) &
...

Fix by initializing the system type string only once during the early
boot.

Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxxx>
Reviewed-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
Patchwork: http://patchwork.linux-mips.org/patch/7437/
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/mips/cavium-octeon/setup.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)

--- a/arch/mips/cavium-octeon/setup.c
+++ b/arch/mips/cavium-octeon/setup.c
@@ -463,6 +463,18 @@ static void octeon_halt(void)
octeon_kill_core(NULL);
}

+static char __read_mostly octeon_system_type[80];
+
+static int __init init_octeon_system_type(void)
+{
+ snprintf(octeon_system_type, sizeof(octeon_system_type), "%s (%s)",
+ cvmx_board_type_to_string(octeon_bootinfo->board_type),
+ octeon_model_get_string(read_c0_prid()));
+
+ return 0;
+}
+early_initcall(init_octeon_system_type);
+
/**
* Handle all the error condition interrupts that might occur.
*
@@ -482,11 +494,7 @@ static irqreturn_t octeon_rlm_interrupt(
*/
const char *octeon_board_type_string(void)
{
- static char name[80];
- sprintf(name, "%s (%s)",
- cvmx_board_type_to_string(octeon_bootinfo->board_type),
- octeon_model_get_string(read_c0_prid()));
- return name;
+ return octeon_system_type;
}

const char *get_system_type(void)


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