ghsa-4f2m-qf8w-84rw
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
nitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert
After commit 5b78ed24e8ec ("mm/pagemap: add mmap_assert_locked() annotations to find_vma*()"), the call to get_user_pages() will trigger the mmap assert.
static inline void mmap_assert_locked(struct mm_struct *mm) { lockdep_assert_held(&mm->mmap_lock); VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm); }
[ 62.521410] kernel BUG at include/linux/mmap_lock.h:156!
...........................................................
[ 62.538938] RIP: 0010:find_vma+0x32/0x80
...........................................................
[ 62.605889] Call Trace:
[ 62.608502]
Use get_user_pages_unlocked() when setting the enclave memory regions. That's a similar pattern as mmap_read_lock() used together with get_user_pages().
{
"affected": [],
"aliases": [
"CVE-2021-46927"
],
"database_specific": {
"cwe_ids": [
"CWE-667"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-02-27T10:15:07Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnitro_enclaves: Use get_user_pages_unlocked() call to handle mmap assert\n\nAfter commit 5b78ed24e8ec (\"mm/pagemap: add mmap_assert_locked()\nannotations to find_vma*()\"), the call to get_user_pages() will trigger\nthe mmap assert.\n\nstatic inline void mmap_assert_locked(struct mm_struct *mm)\n{\n\tlockdep_assert_held(\u0026mm-\u003emmap_lock);\n\tVM_BUG_ON_MM(!rwsem_is_locked(\u0026mm-\u003emmap_lock), mm);\n}\n\n[ 62.521410] kernel BUG at include/linux/mmap_lock.h:156!\n...........................................................\n[ 62.538938] RIP: 0010:find_vma+0x32/0x80\n...........................................................\n[ 62.605889] Call Trace:\n[ 62.608502] \u003cTASK\u003e\n[ 62.610956] ? lock_timer_base+0x61/0x80\n[ 62.614106] find_extend_vma+0x19/0x80\n[ 62.617195] __get_user_pages+0x9b/0x6a0\n[ 62.620356] __gup_longterm_locked+0x42d/0x450\n[ 62.623721] ? finish_wait+0x41/0x80\n[ 62.626748] ? __kmalloc+0x178/0x2f0\n[ 62.629768] ne_set_user_memory_region_ioctl.isra.0+0x225/0x6a0 [nitro_enclaves]\n[ 62.635776] ne_enclave_ioctl+0x1cf/0x6d7 [nitro_enclaves]\n[ 62.639541] __x64_sys_ioctl+0x82/0xb0\n[ 62.642620] do_syscall_64+0x3b/0x90\n[ 62.645642] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nUse get_user_pages_unlocked() when setting the enclave memory regions.\nThat\u0027s a similar pattern as mmap_read_lock() used together with\nget_user_pages().",
"id": "GHSA-4f2m-qf8w-84rw",
"modified": "2024-04-10T18:30:46Z",
"published": "2024-02-27T12:31:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46927"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3a0152b219523227c2a62a0a122cf99608287176"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/90d2beed5e753805c5eab656b8d48257638fe543"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}