UBUNTU-CVE-2023-52451
In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries/memhp: Fix access beyond end of drmem array dlpar_memory_remove_by_index() may access beyond the bounds of the drmem lmb array when the LMB lookup fails to match an entry with the given DRC index. When the search fails, the cursor is left pointing to &drmem_info->lmbs[drmem_info->n_lmbs], which is one element past the last valid entry in the array. The debug message at the end of the function then dereferences this pointer: pr_debug("Failed to hot-remove memory at %llx\n", lmb->base_addr); This was found by inspection and confirmed with KASAN: pseries-hotplug-mem: Attempting to hot-remove LMB, drc index 1234 ================================================================== BUG: KASAN: slab-out-of-bounds in dlpar_memory+0x298/0x1658 Read of size 8 at addr c000000364e97fd0 by task bash/949 dump_stack_lvl+0xa4/0xfc (unreliable) print_report+0x214/0x63c kasan_report+0x140/0x2e0 __asan_load8+0xa8/0xe0 dlpar_memory+0x298/0x1658 handle_dlpar_errorlog+0x130/0x1d0 dlpar_store+0x18c/0x3e0 kobj_attr_store+0x68/0xa0 sysfs_kf_write+0xc4/0x110 kernfs_fop_write_iter+0x26c/0x390 vfs_write+0x2d4/0x4e0 ksys_write+0xac/0x1a0 system_call_exception+0x268/0x530 system_call_vectored_common+0x15c/0x2ec Allocated by task 1: kasan_save_stack+0x48/0x80 kasan_set_track+0x34/0x50 kasan_save_alloc_info+0x34/0x50 __kasan_kmalloc+0xd0/0x120 __kmalloc+0x8c/0x320 kmalloc_array.constprop.0+0x48/0x5c drmem_init+0x2a0/0x41c do_one_initcall+0xe0/0x5c0 kernel_init_freeable+0x4ec/0x5a0 kernel_init+0x30/0x1e0 ret_from_kernel_user_thread+0x14/0x1c The buggy address belongs to the object at c000000364e80000 which belongs to the cache kmalloc-128k of size 131072 The buggy address is located 0 bytes to the right of allocated 98256-byte region [c000000364e80000, c000000364e97fd0) ================================================================== pseries-hotplug-mem: Failed to hot-remove memory at 0 Log failed lookups with a separate message and dereference the cursor only when it points to a valid entry.
02 / AFFECTED SOFTWARE
Affected packages
7 explicit affected versions
27 explicit affected versions
39 explicit affected versions
50 explicit affected versions
6 explicit affected versions
12 explicit affected versions
16 explicit affected versions
6 explicit affected versions
48 explicit affected versions
34 explicit affected versions
55 explicit affected versions
45 explicit affected versions
34 explicit affected versions
7 explicit affected versions
41 explicit affected versions
7 explicit affected versions
42 explicit affected versions
82 explicit affected versions
9 explicit affected versions
59 explicit affected versions
35 explicit affected versions
1 explicit affected versions
13 explicit affected versions
18 explicit affected versions
3 explicit affected versions
90 explicit affected versions
28 explicit affected versions
84 explicit affected versions
13 explicit affected versions
4 explicit affected versions
23 explicit affected versions
95 explicit affected versions
1 explicit affected versions
21 explicit affected versions
9 explicit affected versions
16 explicit affected versions
10 explicit affected versions
39 explicit affected versions
7 explicit affected versions
12 explicit affected versions
32 explicit affected versions
12 explicit affected versions
10 explicit affected versions
7 explicit affected versions
72 explicit affected versions
12 explicit affected versions
87 explicit affected versions
95 explicit affected versions
12 explicit affected versions
83 explicit affected versions
8 explicit affected versions
10 explicit affected versions
161 explicit affected versions
37 explicit affected versions
94 explicit affected versions
9 explicit affected versions
10 explicit affected versions
21 explicit affected versions
1 explicit affected versions
25 explicit affected versions
26 explicit affected versions
13 explicit affected versions
4 explicit affected versions
1 explicit affected versions
29 explicit affected versions
76 explicit affected versions
13 explicit affected versions
45 explicit affected versions
1 explicit affected versions
71 explicit affected versions
43 explicit affected versions
87 explicit affected versions
5 explicit affected versions
33 explicit affected versions
23 explicit affected versions
10 explicit affected versions
88 explicit affected versions
11 explicit affected versions
12 explicit affected versions
111 explicit affected versions
7 explicit affected versions
12 explicit affected versions
86 explicit affected versions
2 explicit affected versions
34 explicit affected versions
26 explicit affected versions
104 explicit affected versions
42 explicit affected versions
124 explicit affected versions
10 explicit affected versions
26 explicit affected versions
21 explicit affected versions
1 explicit affected versions
13 explicit affected versions
111 explicit affected versions
45 explicit affected versions
16 explicit affected versions
45 explicit affected versions
35 explicit affected versions
3 explicit affected versions
65 explicit affected versions
1 explicit affected versions
2 explicit affected versions
52 explicit affected versions
51 explicit affected versions
64 explicit affected versions
1 explicit affected versions
12 explicit affected versions
32 explicit affected versions
25 explicit affected versions
18 explicit affected versions
1 explicit affected versions
1 explicit affected versions
68 explicit affected versions
8 explicit affected versions
6 explicit affected versions
5 explicit affected versions
8 explicit affected versions
1 explicit affected versions
10 explicit affected versions
9 explicit affected versions
75 explicit affected versions
13 explicit affected versions
39 explicit affected versions
7 explicit affected versions
66 explicit affected versions
37 explicit affected versions
10 explicit affected versions
11 explicit affected versions
12 explicit affected versions
74 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
31 explicit affected versions
37 explicit affected versions
14 explicit affected versions
38 explicit affected versions
35 explicit affected versions
9 explicit affected versions
34 explicit affected versions
11 explicit affected versions
138 explicit affected versions
42 explicit affected versions
8 explicit affected versions
7 explicit affected versions
16 explicit affected versions
71 explicit affected versions
46 explicit affected versions
115 explicit affected versions
94 explicit affected versions
4 explicit affected versions
1 explicit affected versions
1 explicit affected versions
40 explicit affected versions
87 explicit affected versions
10 explicit affected versions
43 explicit affected versions
40 explicit affected versions
118 explicit affected versions
138 explicit affected versions
10 explicit affected versions
8 explicit affected versions
14 explicit affected versions
75 explicit affected versions
4 explicit affected versions
64 explicit affected versions
7 explicit affected versions
1 explicit affected versions
41 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries/memhp: Fix access beyond end of drmem array dlpar_memory_remove_by_index() may access beyond the bounds of the drmem lmb array when the LMB lookup fails to match an entry with the given DRC index. When the search fails, the cursor is left pointing to &drmem_info->lmbs[drmem_info->n_lmbs], which is one element past the last valid entry in the array. The debug message at the end of the function then dereferences this pointer: pr_debug("Failed to hot-remove memory at %llx\n", lmb->base_addr); This was found by inspection and confirmed with KASAN: pseries-hotplug-mem: Attempting to hot-remove LMB, drc index 1234 ================================================================== BUG: KASAN: slab-out-of-bounds in dlpar_memory+0x298/0x1658 Read of size 8 at addr c000000364e97fd0 by task bash/949 dump_stack_lvl+0xa4/0xfc (unreliable) print_report+0x214/0x63c kasan_report+0x140/0x2e0 __asan_load8+0xa8/0xe0 dlpar_memory+0x298/0x1658 handle_dlpar_errorlog+0x130/0x1d0 dlpar_store+0x18c/0x3e0 kobj_attr_store+0x68/0xa0 sysfs_kf_write+0xc4/0x110 kernfs_fop_write_iter+0x26c/0x390 vfs_write+0x2d4/0x4e0 ksys_write+0xac/0x1a0 system_call_exception+0x268/0x530 system_call_vectored_common+0x15c/0x2ec Allocated by task 1: kasan_save_stack+0x48/0x80 kasan_set_track+0x34/0x50 kasan_save_alloc_info+0x34/0x50 __kasan_kmalloc+0xd0/0x120 __kmalloc+0x8c/0x320 kmalloc_array.constprop.0+0x48/0x5c drmem_init+0x2a0/0x41c do_one_initcall+0xe0/0x5c0 kernel_init_freeable+0x4ec/0x5a0 kernel_init+0x30/0x1e0 ret_from_kernel_user_thread+0x14/0x1c The buggy address belongs to the object at c000000364e80000 which belongs to the cache kmalloc-128k of size 131072 The buggy address is located 0 bytes to the right of allocated 98256-byte region [c000000364e80000, c000000364e97fd0) ================================================================== pseries-hotplug-mem: Failed to hot-remove memory at 0 Log failed lookups with a separate message and dereference the cursor only when it points to a valid entry.
05 / REFERENCES
Further evidence
- https://git.kernel.org/stable/c/026fd977dc50ff4a5e09bfb0603557f104d3f3a0
- https://git.kernel.org/stable/c/708a4b59baad96c4718dc0bd3a3427d3ab22fedc
- https://git.kernel.org/stable/c/999a27b3ce9a69d54ccd5db000ec3a447bc43e6d
- https://git.kernel.org/stable/c/9b5f03500bc5b083c0df696d7dd169d7ef3dd0c7
- https://git.kernel.org/stable/c/b582aa1f66411d4adcc1aa55b8c575683fb4687e
- https://git.kernel.org/stable/c/bb79613a9a704469ddb8d6c6029d532a5cea384c
- https://git.kernel.org/stable/c/bd68ffce69f6cf8ddd3a3c32549d1d2275e49fc5
- https://git.kernel.org/stable/c/df16afba2378d985359812c865a15c05c70a967e
- https://ubuntu.com/security/CVE-2023-52451
- https://ubuntu.com/security/notices/USN-6688-1
- https://ubuntu.com/security/notices/USN-6725-1
- https://ubuntu.com/security/notices/USN-6725-2
- https://ubuntu.com/security/notices/USN-6726-1
- https://ubuntu.com/security/notices/USN-6726-2
- https://ubuntu.com/security/notices/USN-6726-3
- https://ubuntu.com/security/notices/USN-6739-1
- https://ubuntu.com/security/notices/USN-6740-1
- https://ubuntu.com/security/notices/USN-6818-1
- https://ubuntu.com/security/notices/USN-6818-2
- https://ubuntu.com/security/notices/USN-6818-3
- https://ubuntu.com/security/notices/USN-6818-4
- https://ubuntu.com/security/notices/USN-6819-1
- https://ubuntu.com/security/notices/USN-6819-2
- https://ubuntu.com/security/notices/USN-6819-3
- https://ubuntu.com/security/notices/USN-6819-4
- https://www.cve.org/CVERecord?id=CVE-2023-52451