Revision 647e82dbf85124697be59a4b4cf00c0d38177dcb authored by Andy Shevchenko on 01 September 2022, 11:34:06 UTC, committed by Hans de Goede on 01 September 2022, 15:51:34 UTC
We have to copy only selected fields from the original resource. Because a PCI device will be removed immediately after getting its resources, we may not use any allocated data, hence we may not copy any pointers. Consider the following scenario: 1/ a caller of p2sb_bar() gets the resource; 2/ the resource has been copied by platform_device_add_data() in order to create a platform device; 3/ the platform device creation will call for the device driver's ->probe() as soon as a match found; 4/ the ->probe() takes given resources (see 2/) and tries to access one of its field, i.e. 'name', in the __devm_ioremap_resource() to create a pretty looking output; 5/ but the 'name' is a dangling pointer because p2sb_bar() removed a PCI device, which 'name' had been copied to the caller's memory. 6/ UAF (Use-After-Free) as a result. Kudos to Mika for the initial analisys of the issue. Fixes: 9745fb07474f ("platform/x86/intel: Add Primary to Sideband (P2SB) bridge support") Reported-by: kernel test robot <oliver.sang@intel.com> Suggested-by: Mika Westerberg <mika.westerberg@linux.intel.com> Link: https://lore.kernel.org/linux-i2c/YvPCbnKqDiL2XEKp@xsang-OptiPlex-9020/ Link: https://lore.kernel.org/linux-i2c/YtjAswDKfiuDfWYs@xsang-OptiPlex-9020/ Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20220901113406.65876-1-andriy.shevchenko@linux.intel.com Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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File | Mode | Size |
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unittest-data | ||
Kconfig | -rw-r--r-- | 2.2 KB |
Makefile | -rw-r--r-- | 670 bytes |
address.c | -rw-r--r-- | 27.3 KB |
base.c | -rw-r--r-- | 56.4 KB |
device.c | -rw-r--r-- | 9.8 KB |
dynamic.c | -rw-r--r-- | 22.8 KB |
fdt.c | -rw-r--r-- | 34.5 KB |
fdt_address.c | -rw-r--r-- | 6.2 KB |
irq.c | -rw-r--r-- | 20.1 KB |
kexec.c | -rw-r--r-- | 11.2 KB |
kobj.c | -rw-r--r-- | 3.9 KB |
of_numa.c | -rw-r--r-- | 3.9 KB |
of_private.h | -rw-r--r-- | 5.5 KB |
of_reserved_mem.c | -rw-r--r-- | 11.3 KB |
overlay.c | -rw-r--r-- | 34.6 KB |
pdt.c | -rw-r--r-- | 4.8 KB |
platform.c | -rw-r--r-- | 21.5 KB |
property.c | -rw-r--r-- | 43.4 KB |
resolver.c | -rw-r--r-- | 8.7 KB |
unittest.c | -rw-r--r-- | 98.8 KB |
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