CVE-2025-38233

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> powerpc64/ftrace: fix clobbered r15 during livepatching<br /> <br /> While r15 is clobbered always with PPC_FTRACE_OUT_OF_LINE, it is<br /> not restored in livepatch sequence leading to not so obvious fails<br /> like below:<br /> <br /> BUG: Unable to handle kernel data access on write at 0xc0000000000f9078<br /> Faulting instruction address: 0xc0000000018ff958<br /> Oops: Kernel access of bad area, sig: 11 [#1]<br /> ...<br /> NIP: c0000000018ff958 LR: c0000000018ff930 CTR: c0000000009c0790<br /> REGS: c00000005f2e7790 TRAP: 0300 Tainted: G K (6.14.0+)<br /> MSR: 8000000000009033 CR: 2822880b XER: 20040000<br /> CFAR: c0000000008addc0 DAR: c0000000000f9078 DSISR: 0a000000 IRQMASK: 1<br /> GPR00: c0000000018f2584 c00000005f2e7a30 c00000000280a900 c000000017ffa488<br /> GPR04: 0000000000000008 0000000000000000 c0000000018f24fc 000000000000000d<br /> GPR08: fffffffffffe0000 000000000000000d 0000000000000000 0000000000008000<br /> GPR12: c0000000009c0790 c000000017ffa480 c00000005f2e7c78 c0000000000f9070<br /> GPR16: c00000005f2e7c90 0000000000000000 0000000000000000 0000000000000000<br /> GPR20: 0000000000000000 c00000005f3efa80 c00000005f2e7c60 c00000005f2e7c88<br /> GPR24: c00000005f2e7c60 0000000000000001 c0000000000f9078 0000000000000000<br /> GPR28: 00007fff97960000 c000000017ffa480 0000000000000000 c0000000000f9078<br /> ...<br /> Call Trace:<br /> check_heap_object+0x34/0x390 (unreliable)<br /> __mutex_unlock_slowpath.isra.0+0xe4/0x230<br /> seq_read_iter+0x430/0xa90<br /> proc_reg_read_iter+0xa4/0x200<br /> vfs_read+0x41c/0x510<br /> ksys_read+0xa4/0x190<br /> system_call_exception+0x1d0/0x440<br /> system_call_vectored_common+0x15c/0x2ec<br /> <br /> Fix it by restoring r15 always.