| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-56781: powerpc/prom_init: Fixup missing powermac #size-cells |
| |
| Description |
| =========== |
| |
| 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 it's 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") |
| |
| The Linux kernel CVE team has assigned CVE-2024-56781 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.287 with commit 0b94d838018fb0a824e0cd3149034928c99fb1b7 |
| Fixed in 5.10.231 with commit a79a7e3c03ae2a07f68b5f24d5ed549f9799ec89 |
| Fixed in 5.15.174 with commit ee68554d2c03e32077f7b984e5289fdb005036d2 |
| Fixed in 6.1.120 with commit 6d5f0453a2228607333bff0c85238a3cb495d194 |
| Fixed in 6.6.66 with commit 691284c2cd33ffaa0b35ce53b3286b90621e9dc9 |
| Fixed in 6.12.5 with commit 296a109fa77110ba5267fe0e90a26005eecc2726 |
| Fixed in 6.13 with commit cf89c9434af122f28a3552e6f9cc5158c33ce50a |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-56781 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| arch/powerpc/kernel/prom_init.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/0b94d838018fb0a824e0cd3149034928c99fb1b7 |
| https://git.kernel.org/stable/c/a79a7e3c03ae2a07f68b5f24d5ed549f9799ec89 |
| https://git.kernel.org/stable/c/ee68554d2c03e32077f7b984e5289fdb005036d2 |
| https://git.kernel.org/stable/c/6d5f0453a2228607333bff0c85238a3cb495d194 |
| https://git.kernel.org/stable/c/691284c2cd33ffaa0b35ce53b3286b90621e9dc9 |
| https://git.kernel.org/stable/c/296a109fa77110ba5267fe0e90a26005eecc2726 |
| https://git.kernel.org/stable/c/cf89c9434af122f28a3552e6f9cc5158c33ce50a |
