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After commit f2d3b9a46e ("ARM: 9220/1: amba: Remove deferred device
addition"), it became possible for amba_read_periphid() to be invoked
concurrently from two threads for a particular AMBA device.
Consider the case where a thread (T0) is registering an AMBA driver, and
searching for all of the devices it can match with on the AMBA bus.
Suppose that another thread (T1) is executing the deferred probe work,
and is searching through all of the AMBA drivers on the bus for a driver
that matches a particular AMBA device. Assume that both threads begin
operating on the same AMBA device and the device's peripheral ID is
still unknown.
In this scenario, the amba_match() function will be invoked for the
same AMBA device by both threads, which means amba_read_periphid()
can also be invoked by both threads, and both threads will be able
to manipulate the AMBA device's pclk pointer without any synchronization.
It's possible that one thread will initialize the pclk pointer, then the
other thread will re-initialize it, overwriting the previous value, and
both will race to free the same pclk, resulting in a use-after-free for
whichever thread frees the pclk last.
Add a lock per AMBA device to synchronize the handling with detecting the
peripheral ID to avoid the use-after-free scenario.
The following KFENCE bug report helped detect this problem:
==================================================================
BUG: KFENCE: use-after-free read in clk_disable+0x14/0x34
Use-after-free read at 0x(ptrval) (in kfence-#19):
clk_disable+0x14/0x34
amba_read_periphid+0xdc/0x134
amba_match+0x3c/0x84
__driver_attach+0x20/0x158
bus_for_each_dev+0x74/0xc0
bus_add_driver+0x154/0x1e8
driver_register+0x88/0x11c
do_one_initcall+0x8c/0x2fc
kernel_init_freeable+0x190/0x220
kernel_init+0x10/0x108
ret_from_fork+0x14/0x3c
0x0
kfence-#19: 0x(ptrval)-0x(ptrval), size=36, cache=kmalloc-64
allocated by task 8 on cpu 0 at 11.629931s:
clk_hw_create_clk+0x38/0x134
amba_get_enable_pclk+0x10/0x68
amba_read_periphid+0x28/0x134
amba_match+0x3c/0x84
__device_attach_driver+0x2c/0xc4
bus_for_each_drv+0x80/0xd0
__device_attach+0xb0/0x1f0
bus_probe_device+0x88/0x90
deferred_probe_work_func+0x8c/0xc0
process_one_work+0x23c/0x690
worker_thread+0x34/0x488
kthread+0xd4/0xfc
ret_from_fork+0x14/0x3c
0x0
freed by task 8 on cpu 0 at 11.630095s:
amba_read_periphid+0xec/0x134
amba_match+0x3c/0x84
__device_attach_driver+0x2c/0xc4
bus_for_each_drv+0x80/0xd0
__device_attach+0xb0/0x1f0
bus_probe_device+0x88/0x90
deferred_probe_work_func+0x8c/0xc0
process_one_work+0x23c/0x690
worker_thread+0x34/0x488
kthread+0xd4/0xfc
ret_from_fork+0x14/0x3c
0x0
Cc: Saravana Kannan <saravanak@google.com>
Cc: patches@armlinux.org.uk
Fixes: f2d3b9a46e ("ARM: 9220/1: amba: Remove deferred device addition")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Isaac J. Manjarres <isaacmanjarres@google.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
25af7406df