CVE-2024-56781

In the Linux kernel, the following vulnerability has been resolved:

powerpc/prom_init: Fixup missing powermac #size-cells

On some powermacs escc nodes are missing #size-cells properties, which is deprecated and now triggers a warning at boot since commit 045b14ca5c36 (of: WARN on deprecated #address-cells/#size-cells handling).

For example:

Missing #size-cells in /pci@f2000000/mac-io@c/escc@13000 WARNING: CPU: 0 PID: 0 at drivers/of/base.c:133 of_bus_n_size_cells+0x98/0x108 Hardware name: PowerMac3,1 7400 0xc0209 PowerMac … Call Trace: of_bus_n_size_cells+0x98/0x108 (unreliable) of_bus_default_count_cells+0x40/0x60 __of_get_address+0xc8/0x21c __of_address_to_resource+0x5c/0x228 pmz_init_port+0x5c/0x2ec pmz_probe.isra.0+0x144/0x1e4 pmz_console_init+0x10/0x48 console_init+0xcc/0x138 start_kernel+0x5c4/0x694

As powermacs boot via prom_init its possible to add the missing properties to the device tree during boot, avoiding the warning. Note that escc-legacy nodes are also missing #size-cells properties, but they are skipped by the macio driver, so leave them alone.

Depends-on: 045b14ca5c36 (of: WARN on deprecated #address-cells/#size-cells handling)

Affected Software

References

• https://git.kernel.org/stable/c/0b94d838018fb0a824e0cd3149034928c99fb1b7
• https://git.kernel.org/stable/c/296a109fa77110ba5267fe0e90a26005eecc2726
• https://git.kernel.org/stable/c/691284c2cd33ffaa0b35ce53b3286b90621e9dc9
• https://git.kernel.org/stable/c/6d5f0453a2228607333bff0c85238a3cb495d194
• https://git.kernel.org/stable/c/a79a7e3c03ae2a07f68b5f24d5ed549f9799ec89
• https://git.kernel.org/stable/c/cf89c9434af122f28a3552e6f9cc5158c33ce50a
• https://git.kernel.org/stable/c/ee68554d2c03e32077f7b984e5289fdb005036d2