From 33a154a96e71a34a1bcca9f40da343dbbf7b38b4 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 1 Oct 2026 14:52:55 +0000 Subject: selftests/bpf: Test packet range of pointers sharing an id Add tests where two packet pointers share an id and tightening one pointer's umax from its var_off would put it less than their constant distance from the other's umax: with an index & 0x38 capped at 50, the base pointer keeps umax 50, so the pointer 8 bytes further on must keep umax 58, even though its known bits allow at most 56. These refused a valid program or accepted an out-of-bounds access before the fix: - check the advanced copy, load through the base: valid, was refused; - check the base, load the byte at base + 1 through a copy advanced by 8: was accepted; - check base + 4, load 4 bytes at base + 2 through base + 8: reads two bytes past the checked range, was accepted; - the same as the second with data_meta pointers checked against data: was accepted. These pass with and without the fix and cover nearby paths: - subtract an unknown scalar from a checked pointer and load below it (the range is kept across a new id); - reach a load through two paths whose checks cover 8 and 7 bytes after the loaded pointer; the second path must not be pruned by the first; - spill a copy of a pointer, check the pointer, fill the copy and load one byte past the checked range: the load is refused, and the copy has the range of the check. Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20261001145255.855630-2-alexei.starovoitov@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- include/trace/events/mce.h | 95 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 include/trace/events/mce.h (limited to 'include/trace/events/mce.h') diff --git a/include/trace/events/mce.h b/include/trace/events/mce.h new file mode 100644 index 000000000..c1c50df9e --- /dev/null +++ b/include/trace/events/mce.h @@ -0,0 +1,95 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM mce + +#if !defined(_TRACE_MCE_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_MCE_H + +#include +#include +#include + +/* + * MCE Event Record. + * + * Only very relevant and transient information which cannot be + * gathered from a system by any other means or which can only be + * acquired arduously should be added to this record. + */ + +TRACE_EVENT(mce_record, + + TP_PROTO(struct mce_hw_err *err), + + TP_ARGS(err), + + TP_STRUCT__entry( + __field( u64, mcgcap ) + __field( u64, mcgstatus ) + __field( u64, status ) + __field( u64, addr ) + __field( u64, misc ) + __field( u64, synd ) + __field( u64, ipid ) + __field( u64, ip ) + __field( u64, tsc ) + __field( u64, ppin ) + __field( u64, walltime ) + __field( u32, cpu ) + __field( u32, cpuid ) + __field( u32, apicid ) + __field( u32, socketid ) + __field( u8, cs ) + __field( u8, bank ) + __field( u8, cpuvendor ) + __field( u32, microcode ) + __dynamic_array(u8, v_data, sizeof(err->vendor)) + ), + + TP_fast_assign( + __entry->mcgcap = err->m.mcgcap; + __entry->mcgstatus = err->m.mcgstatus; + __entry->status = err->m.status; + __entry->addr = err->m.addr; + __entry->misc = err->m.misc; + __entry->synd = err->m.synd; + __entry->ipid = err->m.ipid; + __entry->ip = err->m.ip; + __entry->tsc = err->m.tsc; + __entry->ppin = err->m.ppin; + __entry->walltime = err->m.time; + __entry->cpu = err->m.extcpu; + __entry->cpuid = err->m.cpuid; + __entry->apicid = err->m.apicid; + __entry->socketid = err->m.socketid; + __entry->cs = err->m.cs; + __entry->bank = err->m.bank; + __entry->cpuvendor = err->m.cpuvendor; + __entry->microcode = err->m.microcode; + memcpy(__get_dynamic_array(v_data), &err->vendor, sizeof(err->vendor)); + ), + + TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016llx, IPID: %016llx, ADDR: %016llx, MISC: %016llx, SYND: %016llx, RIP: %02x:<%016llx>, TSC: %llx, PPIN: %llx, vendor: %u, CPUID: %x, time: %llu, socket: %u, APIC: %x, microcode: %x, vendor data: %s", + __entry->cpu, + __entry->mcgcap, __entry->mcgstatus, + __entry->bank, __entry->status, + __entry->ipid, + __entry->addr, + __entry->misc, + __entry->synd, + __entry->cs, __entry->ip, + __entry->tsc, + __entry->ppin, + __entry->cpuvendor, + __entry->cpuid, + __entry->walltime, + __entry->socketid, + __entry->apicid, + __entry->microcode, + __print_dynamic_array(v_data, sizeof(u8))) +); + +#endif /* _TRACE_MCE_H */ + +/* This part must be outside protection */ +#include -- cgit v1.3.1