| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-22072: spufs: fix gang directory lifetimes |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| spufs: fix gang directory lifetimes |
| |
| prior to "[POWERPC] spufs: Fix gang destroy leaks" we used to have |
| a problem with gang lifetimes - creation of a gang returns opened |
| gang directory, which normally gets removed when that gets closed, |
| but if somebody has created a context belonging to that gang and |
| kept it alive until the gang got closed, removal failed and we |
| ended up with a leak. |
| |
| Unfortunately, it had been fixed the wrong way. Dentry of gang |
| directory was no longer pinned, and rmdir on close was gone. |
| One problem was that failure of open kept calling simple_rmdir() |
| as cleanup, which meant an unbalanced dput(). Another bug was |
| in the success case - gang creation incremented link count on |
| root directory, but that was no longer undone when gang got |
| destroyed. |
| |
| Fix consists of |
| * reverting the commit in question |
| * adding a counter to gang, protected by ->i_rwsem |
| of gang directory inode. |
| * having it set to 1 at creation time, dropped |
| in both spufs_dir_close() and spufs_gang_close() and bumped |
| in spufs_create_context(), provided that it's not 0. |
| * using simple_recursive_removal() to take the gang |
| directory out when counter reaches zero. |
| |
| The Linux kernel CVE team has assigned CVE-2025-22072 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.22 with commit 877907d37da9694a34adc9dc3e2ce09400148cb5 and fixed in 6.1.134 with commit 880e7b3da2e765c1f90c94c0539be039e96c7062 |
| Issue introduced in 2.6.22 with commit 877907d37da9694a34adc9dc3e2ce09400148cb5 and fixed in 6.6.87 with commit 324f280806aab28ef757aecc18df419676c10ef8 |
| Issue introduced in 2.6.22 with commit 877907d37da9694a34adc9dc3e2ce09400148cb5 and fixed in 6.12.23 with commit 029d8c711f5e5fe8cf63e8a4a1a140a06e224e45 |
| Issue introduced in 2.6.22 with commit 877907d37da9694a34adc9dc3e2ce09400148cb5 and fixed in 6.13.11 with commit 903733782f3ae28a2f7fe4dfb47c7fe3e079a528 |
| Issue introduced in 2.6.22 with commit 877907d37da9694a34adc9dc3e2ce09400148cb5 and fixed in 6.14.2 with commit fc646a6c6d14b5d581f162a7e32999f789e3a3ac |
| Issue introduced in 2.6.22 with commit 877907d37da9694a34adc9dc3e2ce09400148cb5 and fixed in 6.15 with commit c134deabf4784e155d360744d4a6a835b9de4dd4 |
| |
| 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-2025-22072 |
| 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/platforms/cell/spufs/gang.c |
| arch/powerpc/platforms/cell/spufs/inode.c |
| arch/powerpc/platforms/cell/spufs/spufs.h |
| |
| |
| 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/880e7b3da2e765c1f90c94c0539be039e96c7062 |
| https://git.kernel.org/stable/c/324f280806aab28ef757aecc18df419676c10ef8 |
| https://git.kernel.org/stable/c/029d8c711f5e5fe8cf63e8a4a1a140a06e224e45 |
| https://git.kernel.org/stable/c/903733782f3ae28a2f7fe4dfb47c7fe3e079a528 |
| https://git.kernel.org/stable/c/fc646a6c6d14b5d581f162a7e32999f789e3a3ac |
| https://git.kernel.org/stable/c/c134deabf4784e155d360744d4a6a835b9de4dd4 |
