- Vulnerability/
- CVE-2024-56677
CVE-2024-56677: powerpc/fadump: Move fadump_cma_init to setup_arch() after initmem_init()
First published: Sat Dec 28 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: powerpc/fadump: Move fadump_cma_init to setup_arch() after initmem_init() During early init CMA_MIN_ALIGNMENT_BYTES can be PAGE_SIZE, since pageblock_order is still zero and it gets initialized later during initmem_init() e.g. setup_arch() -> initmem_init() -> sparse_init() -> set_pageblock_order() One such use case where this causes issue is - early_setup() -> early_init_devtree() -> fadump_reserve_mem() -> fadump_cma_init() This causes CMA memory alignment check to be bypassed in cma_init_reserved_mem(). Then later cma_activate_area() can hit a VM_BUG_ON_PAGE(pfn & ((1 << order) - 1)) if the reserved memory area was not pageblock_order aligned. Fix it by moving the fadump_cma_init() 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: VM_BUG_ON_PAGE(pfn & ((1 << order) - 1)) ------------[ cut here ]------------ kernel BUG at mm/page_alloc.c:778! Call Trace: __free_one_page+0x57c/0x7b0 (unreliable) free_pcppages_bulk+0x1a8/0x2c8 free_unref_page_commit+0x3d4/0x4e4 free_unref_page+0x458/0x6d0 init_cma_reserved_pageblock+0x114/0x198 cma_init_reserved_areas+0x270/0x3e0 do_one_initcall+0x80/0x2f8 kernel_init_freeable+0x33c/0x530 kernel_init+0x34/0x26c ret_from_kernel_user_thread+0x14/0x1c
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
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Reference Links
- 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
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56677
- https://nvd.nist.gov/vuln/detail/CVE-2024-56677
- https://launchpad.net/bugs/cve/CVE-2024-56677
- https://security-tracker.debian.org/tracker/CVE-2024-56677
- https://ubuntu.com/security/CVE-2024-56677
- https://git.kernel.org/linus/05b94cae1c47f94588c3e7096963c1007c4d9c1d
Frequently Asked Questions
What is the severity of CVE-2024-56677?
CVE-2024-56677 has been classified with a severity level by security analysts, which should be consulted in the CVE database for specifics.
How do I fix CVE-2024-56677?
To fix CVE-2024-56677, ensure you update your Linux kernel to the latest stable version that includes the patched code.
What systems are affected by CVE-2024-56677?
CVE-2024-56677 affects systems running specific versions of the Linux Kernel on PowerPC architecture.
What kind of issues does CVE-2024-56677 address?
CVE-2024-56677 addresses a flaw related to the initialization order of CMA_MIN_ALIGNMENT_BYTES during early setup of the Linux kernel.
Is there a workaround for CVE-2024-56677?
There are no recommended workarounds for CVE-2024-56677; updating the kernel is the advised course of action.
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