CVE-2025-22072 (GCVE-0-2025-22072)
Vulnerability from cvelistv5
Published
2025-04-16 14:12
Modified
2025-05-26 05:17
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/029d8c711f5e5fe8cf63e8a4a1a140a06e224e45
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/324f280806aab28ef757aecc18df419676c10ef8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/880e7b3da2e765c1f90c94c0539be039e96c7062
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/903733782f3ae28a2f7fe4dfb47c7fe3e079a528
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c134deabf4784e155d360744d4a6a835b9de4dd4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc646a6c6d14b5d581f162a7e32999f789e3a3ac
Impacted products
Vendor Product Version
Linux Linux Version: 877907d37da9694a34adc9dc3e2ce09400148cb5
Version: 877907d37da9694a34adc9dc3e2ce09400148cb5
Version: 877907d37da9694a34adc9dc3e2ce09400148cb5
Version: 877907d37da9694a34adc9dc3e2ce09400148cb5
Version: 877907d37da9694a34adc9dc3e2ce09400148cb5
Version: 877907d37da9694a34adc9dc3e2ce09400148cb5
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   Linux Linux Version: 2.6.22
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{
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          "defaultStatus": "unaffected",
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          "programFiles": [
            "arch/powerpc/platforms/cell/spufs/gang.c",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspufs: fix gang directory lifetimes\n\nprior to \"[POWERPC] spufs: Fix gang destroy leaks\" we used to have\na problem with gang lifetimes - creation of a gang returns opened\ngang directory, which normally gets removed when that gets closed,\nbut if somebody has created a context belonging to that gang and\nkept it alive until the gang got closed, removal failed and we\nended up with a leak.\n\nUnfortunately, it had been fixed the wrong way.  Dentry of gang\ndirectory was no longer pinned, and rmdir on close was gone.\nOne problem was that failure of open kept calling simple_rmdir()\nas cleanup, which meant an unbalanced dput().  Another bug was\nin the success case - gang creation incremented link count on\nroot directory, but that was no longer undone when gang got\ndestroyed.\n\nFix consists of\n\t* reverting the commit in question\n\t* adding a counter to gang, protected by -\u003ei_rwsem\nof gang directory inode.\n\t* having it set to 1 at creation time, dropped\nin both spufs_dir_close() and spufs_gang_close() and bumped\nin spufs_create_context(), provided that it\u0027s not 0.\n\t* using simple_recursive_removal() to take the gang\ndirectory out when counter reaches zero."
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      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:17:51.679Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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          "url": "https://git.kernel.org/stable/c/c134deabf4784e155d360744d4a6a835b9de4dd4"
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    "cveId": "CVE-2025-22072",
    "datePublished": "2025-04-16T14:12:24.571Z",
    "dateReserved": "2024-12-29T08:45:45.814Z",
    "dateUpdated": "2025-05-26T05:17:51.679Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-22072\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-16T15:16:01.390\",\"lastModified\":\"2025-04-17T20:22:16.240\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nspufs: fix gang directory lifetimes\\n\\nprior to \\\"[POWERPC] spufs: Fix gang destroy leaks\\\" we used to have\\na problem with gang lifetimes - creation of a gang returns opened\\ngang directory, which normally gets removed when that gets closed,\\nbut if somebody has created a context belonging to that gang and\\nkept it alive until the gang got closed, removal failed and we\\nended up with a leak.\\n\\nUnfortunately, it had been fixed the wrong way.  Dentry of gang\\ndirectory was no longer pinned, and rmdir on close was gone.\\nOne problem was that failure of open kept calling simple_rmdir()\\nas cleanup, which meant an unbalanced dput().  Another bug was\\nin the success case - gang creation incremented link count on\\nroot directory, but that was no longer undone when gang got\\ndestroyed.\\n\\nFix consists of\\n\\t* reverting the commit in question\\n\\t* adding a counter to gang, protected by -\u003ei_rwsem\\nof gang directory inode.\\n\\t* having it set to 1 at creation time, dropped\\nin both spufs_dir_close() and spufs_gang_close() and bumped\\nin spufs_create_context(), provided that it\u0027s not 0.\\n\\t* using simple_recursive_removal() to take the gang\\ndirectory out when counter reaches zero.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/029d8c711f5e5fe8cf63e8a4a1a140a06e224e45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/324f280806aab28ef757aecc18df419676c10ef8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/880e7b3da2e765c1f90c94c0539be039e96c7062\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/903733782f3ae28a2f7fe4dfb47c7fe3e079a528\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c134deabf4784e155d360744d4a6a835b9de4dd4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc646a6c6d14b5d581f162a7e32999f789e3a3ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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