mirror of
https://github.com/CVEProject/cvelist.git
synced 2025-08-04 08:44:25 +00:00
157 lines
9.8 KiB
JSON
157 lines
9.8 KiB
JSON
{
|
|
"data_version": "4.0",
|
|
"data_type": "CVE",
|
|
"data_format": "MITRE",
|
|
"CVE_data_meta": {
|
|
"ID": "CVE-2024-26960",
|
|
"ASSIGNER": "cve@kernel.org",
|
|
"STATE": "PUBLIC"
|
|
},
|
|
"description": {
|
|
"description_data": [
|
|
{
|
|
"lang": "eng",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: swap: fix race between free_swap_and_cache() and swapoff()\n\nThere was previously a theoretical window where swapoff() could run and\nteardown a swap_info_struct while a call to free_swap_and_cache() was\nrunning in another thread. This could cause, amongst other bad\npossibilities, swap_page_trans_huge_swapped() (called by\nfree_swap_and_cache()) to access the freed memory for swap_map.\n\nThis is a theoretical problem and I haven't been able to provoke it from a\ntest case. But there has been agreement based on code review that this is\npossible (see link below).\n\nFix it by using get_swap_device()/put_swap_device(), which will stall\nswapoff(). There was an extra check in _swap_info_get() to confirm that\nthe swap entry was not free. This isn't present in get_swap_device()\nbecause it doesn't make sense in general due to the race between getting\nthe reference and swapoff. So I've added an equivalent check directly in\nfree_swap_and_cache().\n\nDetails of how to provoke one possible issue (thanks to David Hildenbrand\nfor deriving this):\n\n--8<-----\n\n__swap_entry_free() might be the last user and result in\n\"count == SWAP_HAS_CACHE\".\n\nswapoff->try_to_unuse() will stop as soon as soon as si->inuse_pages==0.\n\nSo the question is: could someone reclaim the folio and turn\nsi->inuse_pages==0, before we completed swap_page_trans_huge_swapped().\n\nImagine the following: 2 MiB folio in the swapcache. Only 2 subpages are\nstill references by swap entries.\n\nProcess 1 still references subpage 0 via swap entry.\nProcess 2 still references subpage 1 via swap entry.\n\nProcess 1 quits. Calls free_swap_and_cache().\n-> count == SWAP_HAS_CACHE\n[then, preempted in the hypervisor etc.]\n\nProcess 2 quits. Calls free_swap_and_cache().\n-> count == SWAP_HAS_CACHE\n\nProcess 2 goes ahead, passes swap_page_trans_huge_swapped(), and calls\n__try_to_reclaim_swap().\n\n__try_to_reclaim_swap()->folio_free_swap()->delete_from_swap_cache()->\nput_swap_folio()->free_swap_slot()->swapcache_free_entries()->\nswap_entry_free()->swap_range_free()->\n...\nWRITE_ONCE(si->inuse_pages, si->inuse_pages - nr_entries);\n\nWhat stops swapoff to succeed after process 2 reclaimed the swap cache\nbut before process1 finished its call to swap_page_trans_huge_swapped()?\n\n--8<-----"
|
|
}
|
|
]
|
|
},
|
|
"problemtype": {
|
|
"problemtype_data": [
|
|
{
|
|
"description": [
|
|
{
|
|
"lang": "eng",
|
|
"value": "n/a"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
},
|
|
"affects": {
|
|
"vendor": {
|
|
"vendor_data": [
|
|
{
|
|
"vendor_name": "Linux",
|
|
"product": {
|
|
"product_data": [
|
|
{
|
|
"product_name": "Linux",
|
|
"version": {
|
|
"version_data": [
|
|
{
|
|
"version_affected": "<",
|
|
"version_name": "7c00bafee87c",
|
|
"version_value": "d85c11c97ecf"
|
|
},
|
|
{
|
|
"version_value": "not down converted",
|
|
"x_cve_json_5_version_data": {
|
|
"versions": [
|
|
{
|
|
"version": "4.11",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "4.11",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.10.215",
|
|
"lessThanOrEqual": "5.10.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "5.15.154",
|
|
"lessThanOrEqual": "5.15.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.1.84",
|
|
"lessThanOrEqual": "6.1.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.24",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.7.12",
|
|
"lessThanOrEqual": "6.7.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.8.3",
|
|
"lessThanOrEqual": "6.8.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.9",
|
|
"lessThanOrEqual": "*",
|
|
"status": "unaffected",
|
|
"versionType": "original_commit_for_fix"
|
|
}
|
|
],
|
|
"defaultStatus": "affected"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
]
|
|
}
|
|
},
|
|
"references": {
|
|
"reference_data": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/d85c11c97ecf92d47a4b29e3faca714dc1f18d0d",
|
|
"refsource": "MISC",
|
|
"name": "https://git.kernel.org/stable/c/d85c11c97ecf92d47a4b29e3faca714dc1f18d0d"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/2da5568ee222ce0541bfe446a07998f92ed1643e",
|
|
"refsource": "MISC",
|
|
"name": "https://git.kernel.org/stable/c/2da5568ee222ce0541bfe446a07998f92ed1643e"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/1ede7f1d7eed1738d1b9333fd1e152ccb450b86a",
|
|
"refsource": "MISC",
|
|
"name": "https://git.kernel.org/stable/c/1ede7f1d7eed1738d1b9333fd1e152ccb450b86a"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/0f98f6d2fb5fad00f8299b84b85b6bc1b6d7d19a",
|
|
"refsource": "MISC",
|
|
"name": "https://git.kernel.org/stable/c/0f98f6d2fb5fad00f8299b84b85b6bc1b6d7d19a"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/3ce4c4c653e4e478ecb15d3c88e690f12cbf6b39",
|
|
"refsource": "MISC",
|
|
"name": "https://git.kernel.org/stable/c/3ce4c4c653e4e478ecb15d3c88e690f12cbf6b39"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/363d17e7f7907c8e27a9e86968af0eaa2301787b",
|
|
"refsource": "MISC",
|
|
"name": "https://git.kernel.org/stable/c/363d17e7f7907c8e27a9e86968af0eaa2301787b"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/82b1c07a0af603e3c47b906c8e991dc96f01688e",
|
|
"refsource": "MISC",
|
|
"name": "https://git.kernel.org/stable/c/82b1c07a0af603e3c47b906c8e991dc96f01688e"
|
|
}
|
|
]
|
|
},
|
|
"generator": {
|
|
"engine": "bippy-9e1c9544281a"
|
|
}
|
|
} |