{ "containers": { "cna": { "providerMetadata": { "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros\n\nFloating point instructions in userspace can crash some arm kernels\nbuilt with clang/LLD 17.0.6:\n\n BUG: unsupported FP instruction in kernel mode\n FPEXC == 0xc0000780\n Internal error: Oops - undefined instruction: 0 [#1] ARM\n CPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1\n Hardware name: BCM2835\n PC is at vfp_support_entry+0xc8/0x2cc\n LR is at do_undefinstr+0xa8/0x250\n pc : [] lr : [] psr: a0000013\n sp : dc8d1f68 ip : 60000013 fp : bedea19c\n r10: ec532b17 r9 : 00000010 r8 : 0044766c\n r7 : c0000780 r6 : ec532b17 r5 : c1c13800 r4 : dc8d1fb0\n r3 : c10072c4 r2 : c0101c88 r1 : ec532b17 r0 : 0044766c\n Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none\n Control: 00c5387d Table: 0251c008 DAC: 00000051\n Register r0 information: non-paged memory\n Register r1 information: vmalloc memory\n Register r2 information: non-slab/vmalloc memory\n Register r3 information: non-slab/vmalloc memory\n Register r4 information: 2-page vmalloc region\n Register r5 information: slab kmalloc-cg-2k\n Register r6 information: vmalloc memory\n Register r7 information: non-slab/vmalloc memory\n Register r8 information: non-paged memory\n Register r9 information: zero-size pointer\n Register r10 information: vmalloc memory\n Register r11 information: non-paged memory\n Register r12 information: non-paged memory\n Process vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b)\n Stack: (0xdc8d1f68 to 0xdc8d2000)\n 1f60: 0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0\n 1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010\n 1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188\n 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000\n Call trace:\n [] (vfp_support_entry) from [] (do_undefinstr+0xa8/0x250)\n [] (do_undefinstr) from [] (__und_usr+0x70/0x80)\n Exception stack(0xdc8d1fb0 to 0xdc8d1ff8)\n 1fa0: b6f68af8 00448fc0 00000000 bedea188\n 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff\n Code: 0a000061 e3877202 e594003c e3a09010 (eef16a10)\n ---[ end trace 0000000000000000 ]---\n Kernel panic - not syncing: Fatal exception in interrupt\n ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---\n\nThis is a minimal userspace reproducer on a Raspberry Pi Zero W:\n\n #include \n #include \n\n int main(void)\n {\n double v = 1.0;\n printf(\"%fn\", NAN + *(volatile double *)&v);\n return 0;\n }\n\nAnother way to consistently trigger the oops is:\n\n calvin@raspberry-pi-zero-w ~$ python -c \"import json\"\n\nThe bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n,\nbecause the pr_debug() calls act as barriers even when not activated.\n\nThis is the output from the same kernel source built with the same\ncompiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as\nexpected:\n\n VFP: bounce: trigger ec532b17 fpexc c0000780\n VFP: emulate: INST=0xee377b06 SCR=0x00000000\n VFP: bounce: trigger eef1fa10 fpexc c0000780\n VFP: emulate: INST=0xeeb40b40 SCR=0x00000000\n VFP: raising exceptions 30000000\n\n calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer\n nan\n\nCrudely grepping for vmsr/vmrs instructions in the otherwise nearly\nidential text for vfp_support_entry() makes the problem obvious:\n\n vmlinux.llvm.good [0xc0101cb8] <+48>: vmrs r7, fpexc\n vmlinux.llvm.good [0xc0101cd8] <+80>: vmsr fpexc, r0\n vmlinux.llvm.good [0xc0101d20\n---truncated---" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm/vfp/vfpinstr.h" ], "versions": [ { "version": "4708fb041346", "lessThan": "9fc60f2bdd43", "status": "affected", "versionType": "git" }, { "version": "4708fb041346", "lessThan": "cd595d87e5fd", "status": "affected", "versionType": "git" }, { "version": "4708fb041346", "lessThan": "39caf610a637", "status": "affected", "versionType": "git" }, { "version": "4708fb041346", "lessThan": "89a906dfa8c3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm/vfp/vfpinstr.h" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "custom" }, { "version": "6.6.54", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.10.13", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.11.2", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.12-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9fc60f2bdd43e758bdf0305c0fc83221419ddb3f" }, { "url": "https://git.kernel.org/stable/c/cd595d87e5fdd2fc09ea69359aa85e7f12f4b97b" }, { "url": "https://git.kernel.org/stable/c/39caf610a63786b3b0ef3348ac015edc19827d6a" }, { "url": "https://git.kernel.org/stable/c/89a906dfa8c3b21b3e5360f73c49234ac1eb885b" } ], "title": "ARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros", "x_generator": { "engine": "bippy-c9c4e1df01b2" } } }, "cveMetadata": { "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", "cveID": "CVE-2024-47716", "requesterUserId": "gregkh@kernel.org", "serial": "1", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.0" }