ghsa-5573-w6h2-wwx8
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()
syzbot reported access to unitialized memory in mbind() [1]
Issue came with commit bda420b98505 ("numa balancing: migrate on fault among multiple bound nodes")
This commit added a new bit in MPOL_MODE_FLAGS, but only checked valid combination (MPOL_F_NUMA_BALANCING can only be used with MPOL_BIND) in do_set_mempolicy()
This patch moves the check in sanitize_mpol_flags() so that it is also used by mbind()
[1] BUG: KMSAN: uninit-value in __mpol_equal+0x567/0x590 mm/mempolicy.c:2260 __mpol_equal+0x567/0x590 mm/mempolicy.c:2260 mpol_equal include/linux/mempolicy.h:105 [inline] vma_merge+0x4a1/0x1e60 mm/mmap.c:1190 mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811 do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333 kernel_mbind mm/mempolicy.c:1483 [inline] __do_sys_mbind mm/mempolicy.c:1490 [inline] __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486 __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae
Uninit was created at: slab_alloc_node mm/slub.c:3221 [inline] slab_alloc mm/slub.c:3230 [inline] kmem_cache_alloc+0x751/0xff0 mm/slub.c:3235 mpol_new mm/mempolicy.c:293 [inline] do_mbind+0x912/0x15f0 mm/mempolicy.c:1289 kernel_mbind mm/mempolicy.c:1483 [inline] __do_sys_mbind mm/mempolicy.c:1490 [inline] __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486 __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae ===================================================== Kernel panic - not syncing: panic_on_kmsan set ... CPU: 0 PID: 15049 Comm: syz-executor.0 Tainted: G B 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106 dump_stack+0x25/0x28 lib/dump_stack.c:113 panic+0x44f/0xdeb kernel/panic.c:232 kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186 __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208 __mpol_equal+0x567/0x590 mm/mempolicy.c:2260 mpol_equal include/linux/mempolicy.h:105 [inline] vma_merge+0x4a1/0x1e60 mm/mmap.c:1190 mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811 do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333 kernel_mbind mm/mempolicy.c:1483 [inline] __do_sys_mbind mm/mempolicy.c:1490 [inline] __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486 __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae
{
"affected": [],
"aliases": [
"CVE-2021-47462"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-22T07:15:11Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()\n\nsyzbot reported access to unitialized memory in mbind() [1]\n\nIssue came with commit bda420b98505 (\"numa balancing: migrate on fault\namong multiple bound nodes\")\n\nThis commit added a new bit in MPOL_MODE_FLAGS, but only checked valid\ncombination (MPOL_F_NUMA_BALANCING can only be used with MPOL_BIND) in\ndo_set_mempolicy()\n\nThis patch moves the check in sanitize_mpol_flags() so that it is also\nused by mbind()\n\n [1]\n BUG: KMSAN: uninit-value in __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n mpol_equal include/linux/mempolicy.h:105 [inline]\n vma_merge+0x4a1/0x1e60 mm/mmap.c:1190\n mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811\n do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n Uninit was created at:\n slab_alloc_node mm/slub.c:3221 [inline]\n slab_alloc mm/slub.c:3230 [inline]\n kmem_cache_alloc+0x751/0xff0 mm/slub.c:3235\n mpol_new mm/mempolicy.c:293 [inline]\n do_mbind+0x912/0x15f0 mm/mempolicy.c:1289\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n =====================================================\n Kernel panic - not syncing: panic_on_kmsan set ...\n CPU: 0 PID: 15049 Comm: syz-executor.0 Tainted: G B 5.15.0-rc2-syzkaller #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n Call Trace:\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106\n dump_stack+0x25/0x28 lib/dump_stack.c:113\n panic+0x44f/0xdeb kernel/panic.c:232\n kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186\n __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208\n __mpol_equal+0x567/0x590 mm/mempolicy.c:2260\n mpol_equal include/linux/mempolicy.h:105 [inline]\n vma_merge+0x4a1/0x1e60 mm/mmap.c:1190\n mbind_range+0xcc8/0x1e80 mm/mempolicy.c:811\n do_mbind+0xf42/0x15f0 mm/mempolicy.c:1333\n kernel_mbind mm/mempolicy.c:1483 [inline]\n __do_sys_mbind mm/mempolicy.c:1490 [inline]\n __se_sys_mbind+0x437/0xb80 mm/mempolicy.c:1486\n __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1486\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae",
"id": "GHSA-5573-w6h2-wwx8",
"modified": "2024-05-22T09:31:45Z",
"published": "2024-05-22T09:31:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47462"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6d2aec9e123bb9c49cb5c7fc654f25f81e688e8c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9ee4e9ae98f1f262d6fae0d266cfdf3ba2c321d9"
}
],
"schema_version": "1.4.0",
"severity": []
}