CVE-2024-26589 (GCVE-0-2024-26589)
Vulnerability from cvelistv5
Published
2024-02-22 16:13
Modified
2025-05-04 08:51
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS For PTR_TO_FLOW_KEYS, check_flow_keys_access() only uses fixed off for validation. However, variable offset ptr alu is not prohibited for this ptr kind. So the variable offset is not checked. The following prog is accepted: func#0 @0 0: R1=ctx() R10=fp0 0: (bf) r6 = r1 ; R1=ctx() R6_w=ctx() 1: (79) r7 = *(u64 *)(r6 +144) ; R6_w=ctx() R7_w=flow_keys() 2: (b7) r8 = 1024 ; R8_w=1024 3: (37) r8 /= 1 ; R8_w=scalar() 4: (57) r8 &= 1024 ; R8_w=scalar(smin=smin32=0, smax=umax=smax32=umax32=1024,var_off=(0x0; 0x400)) 5: (0f) r7 += r8 mark_precise: frame0: last_idx 5 first_idx 0 subseq_idx -1 mark_precise: frame0: regs=r8 stack= before 4: (57) r8 &= 1024 mark_precise: frame0: regs=r8 stack= before 3: (37) r8 /= 1 mark_precise: frame0: regs=r8 stack= before 2: (b7) r8 = 1024 6: R7_w=flow_keys(smin=smin32=0,smax=umax=smax32=umax32=1024,var_off =(0x0; 0x400)) R8_w=scalar(smin=smin32=0,smax=umax=smax32=umax32=1024, var_off=(0x0; 0x400)) 6: (79) r0 = *(u64 *)(r7 +0) ; R0_w=scalar() 7: (95) exit This prog loads flow_keys to r7, and adds the variable offset r8 to r7, and finally causes out-of-bounds access: BUG: unable to handle page fault for address: ffffc90014c80038 [...] Call Trace: <TASK> bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline] bpf_flow_dissect+0x15f/0x350 net/core/flow_dissector.c:991 bpf_prog_test_run_flow_dissector+0x39d/0x620 net/bpf/test_run.c:1359 bpf_prog_test_run kernel/bpf/syscall.c:4107 [inline] __sys_bpf+0xf8f/0x4560 kernel/bpf/syscall.c:5475 __do_sys_bpf kernel/bpf/syscall.c:5561 [inline] __se_sys_bpf kernel/bpf/syscall.c:5559 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:5559 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Fix this by rejecting ptr alu with variable offset on flow_keys. Applying the patch rejects the program with "R7 pointer arithmetic on flow_keys prohibited".
References
Impacted products
Vendor Product Version
Linux Linux Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9
Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9
Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9
Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9
Version: d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9
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However, variable offset ptr alu is not prohibited\\nfor this ptr kind. So the variable offset is not checked.\\n\\nThe following prog is accepted:\\n\\n  func#0 @0\\n  0: R1=ctx() R10=fp0\\n  0: (bf) r6 = r1                       ; R1=ctx() R6_w=ctx()\\n  1: (79) r7 = *(u64 *)(r6 +144)        ; R6_w=ctx() R7_w=flow_keys()\\n  2: (b7) r8 = 1024                     ; R8_w=1024\\n  3: (37) r8 /= 1                       ; R8_w=scalar()\\n  4: (57) r8 \u0026= 1024                    ; R8_w=scalar(smin=smin32=0,\\n  smax=umax=smax32=umax32=1024,var_off=(0x0; 0x400))\\n  5: (0f) r7 += r8\\n  mark_precise: frame0: last_idx 5 first_idx 0 subseq_idx -1\\n  mark_precise: frame0: regs=r8 stack= before 4: (57) r8 \u0026= 1024\\n  mark_precise: frame0: regs=r8 stack= before 3: (37) r8 /= 1\\n  mark_precise: frame0: regs=r8 stack= before 2: (b7) r8 = 1024\\n  6: R7_w=flow_keys(smin=smin32=0,smax=umax=smax32=umax32=1024,var_off\\n  =(0x0; 0x400)) R8_w=scalar(smin=smin32=0,smax=umax=smax32=umax32=1024,\\n  var_off=(0x0; 0x400))\\n  6: (79) r0 = *(u64 *)(r7 +0)          ; R0_w=scalar()\\n  7: (95) exit\\n\\nThis prog loads flow_keys to r7, and adds the variable offset r8\\nto r7, and finally causes out-of-bounds access:\\n\\n  BUG: unable to handle page fault for address: ffffc90014c80038\\n  [...]\\n  Call Trace:\\n   \u003cTASK\u003e\\n   bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline]\\n   __bpf_prog_run include/linux/filter.h:651 [inline]\\n   bpf_prog_run include/linux/filter.h:658 [inline]\\n   bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline]\\n   bpf_flow_dissect+0x15f/0x350 net/core/flow_dissector.c:991\\n   bpf_prog_test_run_flow_dissector+0x39d/0x620 net/bpf/test_run.c:1359\\n   bpf_prog_test_run kernel/bpf/syscall.c:4107 [inline]\\n   __sys_bpf+0xf8f/0x4560 kernel/bpf/syscall.c:5475\\n   __do_sys_bpf kernel/bpf/syscall.c:5561 [inline]\\n   __se_sys_bpf kernel/bpf/syscall.c:5559 [inline]\\n   __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:5559\\n   do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n   do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:83\\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nFix this by rejecting ptr alu with variable offset on flow_keys.\\nApplying the patch rejects the program with \\\"R7 pointer arithmetic\\non flow_keys prohibited\\\".\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.148\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.75\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.14\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.2\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"4.20\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:51:42.558Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26589\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T08:51:42.558Z\", \"dateReserved\": \"2024-02-19T14:20:24.126Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-22T16:13:33.713Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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