CVE-2024-56677
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-56677
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56677.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2024-56677
- Downstream
- Related
- Published
- 2024-12-28T09:46:06Z
- Modified
- 2025-10-22T08:06:48.745561Z
- Summary
- powerpc/fadump: Move fadump_cma_init to setup_arch() after initmem_init()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
powerpc/fadump: Move fadumpcmainit to setuparch() after initmeminit()
During early init CMAMINALIGNMENTBYTES can be PAGESIZE, since pageblockorder is still zero and it gets initialized later during initmeminit() e.g. setuparch() -> initmeminit() -> sparseinit() -> setpageblock_order()
One such use case where this causes issue is - earlysetup() -> earlyinitdevtree() -> fadumpreservemem() -> fadumpcma_init()
This causes CMA memory alignment check to be bypassed in cmainitreservedmem(). Then later cmaactivatearea() can hit a VMBUGONPAGE(pfn & ((1 << order) - 1)) if the reserved memory area was not pageblock_order aligned.
Fix it by moving the fadumpcmainit() after initmem_init(), where other such cma reservations also gets called.
<stack trace>
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10010 flags: 0x13ffff800000000(node=1|zone=0|lastcpupid=0x7ffff) CMA raw: 013ffff800000000 5deadbeef0000100 5deadbeef0000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: VMBUGONPAGE(pfn & ((1 << order) - 1)) ------------[ cut here ]------------ kernel BUG at mm/pagealloc.c:778!
Call Trace: _freeonepage+0x57c/0x7b0 (unreliable) freepcppagesbulk+0x1a8/0x2c8 freeunrefpagecommit+0x3d4/0x4e4 freeunrefpage+0x458/0x6d0 initcmareservedpageblock+0x114/0x198 cmainitreservedareas+0x270/0x3e0 dooneinitcall+0x80/0x2f8 kernelinitfreeable+0x33c/0x530 kernelinit+0x34/0x26c retfromkerneluser_thread+0x14/0x1c
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/05b94cae1c47f94588c3e7096963c1007c4d9c1d
- https://git.kernel.org/stable/c/7351c5a6507b4401aeecadb5959131410a339520
- https://git.kernel.org/stable/c/aabef6301dcf410dfd2b8759cd413b2a003c7e3f
- https://git.kernel.org/stable/c/c5c1d1ef70834013fc3bd12b6a0f4664c6d75a74
- https://git.kernel.org/stable/c/f551637fe9bf863386309e03f9d148d97f535ad1
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced11ac3e87ce09c27f4587a8c4fe0829d814021a82Fixedaabef6301dcf410dfd2b8759cd413b2a003c7e3f
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced11ac3e87ce09c27f4587a8c4fe0829d814021a82Fixedc5c1d1ef70834013fc3bd12b6a0f4664c6d75a74
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced11ac3e87ce09c27f4587a8c4fe0829d814021a82Fixedf551637fe9bf863386309e03f9d148d97f535ad1
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced11ac3e87ce09c27f4587a8c4fe0829d814021a82Fixed7351c5a6507b4401aeecadb5959131410a339520
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced11ac3e87ce09c27f4587a8c4fe0829d814021a82Fixed05b94cae1c47f94588c3e7096963c1007c4d9c1d