| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: probes: Fix uprobes for big-endian kernels\n\nThe arm64 uprobes code is broken for big-endian kernels as it doesn't\nconvert the in-memory instruction encoding (which is always\nlittle-endian) into the kernel's native endianness before analyzing and\nsimulating instructions. This may result in a few distinct problems:\n\n* The kernel may may erroneously reject probing an instruction which can\n safely be probed.\n\n* The kernel may erroneously erroneously permit stepping an\n instruction out-of-line when that instruction cannot be stepped\n out-of-line safely.\n\n* The kernel may erroneously simulate instruction incorrectly dur to\n interpretting the byte-swapped encoding.\n\nThe endianness mismatch isn't caught by the compiler or sparse because:\n\n* The arch_uprobe::{insn,ixol} fields are encoded as arrays of u8, so\n the compiler and sparse have no idea these contain a little-endian\n 32-bit value. The core uprobes code populates these with a memcpy()\n which similarly does not handle endianness.\n\n* While the uprobe_opcode_t type is an alias for __le32, both\n arch_uprobe_analyze_insn() and arch_uprobe_skip_sstep() cast from u8[]\n to the similarly-named probe_opcode_t, which is an alias for u32.\n Hence there is no endianness conversion warning.\n\nFix this by changing the arch_uprobe::{insn,ixol} fields to __le32 and\nadding the appropriate __le32_to_cpu() conversions prior to consuming\nthe instruction encoding. The core uprobes copies these fields as opaque\nranges of bytes, and so is unaffected by this change.\n\nAt the same time, remove MAX_UINSN_BYTES and consistently use\nAARCH64_INSN_SIZE for clarity.\n\nTested with the following:\n\n| #include <stdio.h>\n| #include <stdbool.h>\n|\n| #define noinline __attribute__((noinline))\n|\n| static noinline void *adrp_self(void)\n| {\n| void *addr;\n|\n| asm volatile(\n| \" adrp %x0, adrp_self\\n\"\n| \" add %x0, %x0, :lo12:adrp_self\\n\"\n| : \"=r\" (addr));\n| }\n|\n|\n| int main(int argc, char *argv)\n| {\n| void *ptr = adrp_self();\n| bool equal = (ptr == adrp_self);\n|\n| printf(\"adrp_self => %p\\n\"\n| \"adrp_self() => %p\\n\"\n| \"%s\\n\",\n| adrp_self, ptr, equal ? \"EQUAL\" : \"NOT EQUAL\");\n|\n| return 0;\n| }\n\n.... where the adrp_self() function was compiled to:\n\n| 00000000004007e0 <adrp_self>:\n| 4007e0: 90000000 adrp x0, 400000 <__ehdr_start>\n| 4007e4: 911f8000 add x0, x0, #0x7e0\n| 4007e8: d65f03c0 ret\n\nBefore this patch, the ADRP is not recognized, and is assumed to be\nsteppable, resulting in corruption of the result:\n\n| # ./adrp-self\n| adrp_self => 0x4007e0\n| adrp_self() => 0x4007e0\n| EQUAL\n| # echo 'p /root/adrp-self:0x007e0' > /sys/kernel/tracing/uprobe_events\n| # echo 1 > /sys/kernel/tracing/events/uprobes/enable\n| # ./adrp-self\n| adrp_self => 0x4007e0\n| adrp_self() => 0xffffffffff7e0\n| NOT EQUAL\n\nAfter this patch, the ADRP is correctly recognized and simulated:\n\n| # ./adrp-self\n| adrp_self => 0x4007e0\n| adrp_self() => 0x4007e0\n| EQUAL\n| #\n| # echo 'p /root/adrp-self:0x007e0' > /sys/kernel/tracing/uprobe_events\n| # echo 1 > /sys/kernel/tracing/events/uprobes/enable\n| # ./adrp-self\n| adrp_self => 0x4007e0\n| adrp_self() => 0x4007e0\n| EQUAL" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "arch/arm64/include/asm/uprobes.h", |
| "arch/arm64/kernel/probes/uprobes.c" |
| ], |
| "versions": [ |
| { |
| "version": "9842ceae9fa8deae141533d52a6ead7666962c09", |
| "lessThan": "b6a638cb600e13f94b5464724eaa6ab7f3349ca2", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9842ceae9fa8deae141533d52a6ead7666962c09", |
| "lessThan": "e6ab336213918575124d6db43dc5d3554526242e", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9842ceae9fa8deae141533d52a6ead7666962c09", |
| "lessThan": "cf9ddf9ed94c15564a05bbf6e9f18dffa0c7df80", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9842ceae9fa8deae141533d52a6ead7666962c09", |
| "lessThan": "cf60d19d40184e43d9a624e55a0da73be09e938d", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9842ceae9fa8deae141533d52a6ead7666962c09", |
| "lessThan": "14841bb7a531b96e2dde37423a3b33e75147c60d", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9842ceae9fa8deae141533d52a6ead7666962c09", |
| "lessThan": "8165bf83b8a64be801d59cd2532b0d1ffed74d00", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9842ceae9fa8deae141533d52a6ead7666962c09", |
| "lessThan": "3d2530c65be04e93720e30f191a7cf1a3aa8b51c", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "9842ceae9fa8deae141533d52a6ead7666962c09", |
| "lessThan": "13f8f1e05f1dc36dbba6cba0ae03354c0dafcde7", |
| "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/arm64/include/asm/uprobes.h", |
| "arch/arm64/kernel/probes/uprobes.c" |
| ], |
| "versions": [ |
| { |
| "version": "4.10", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "4.10", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.19.323", |
| "lessThanOrEqual": "4.19.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.285", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.229", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.170", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.1.115", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.58", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.11.5", |
| "lessThanOrEqual": "6.11.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.12", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
| "cpeApplicability": [ |
| { |
| "nodes": [ |
| { |
| "operator": "OR", |
| "negate": false, |
| "cpeMatch": [ |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.10", |
| "versionEndExcluding": "4.19.323" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.10", |
| "versionEndExcluding": "5.4.285" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.10", |
| "versionEndExcluding": "5.10.229" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.10", |
| "versionEndExcluding": "5.15.170" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.10", |
| "versionEndExcluding": "6.1.115" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.10", |
| "versionEndExcluding": "6.6.58" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.10", |
| "versionEndExcluding": "6.11.5" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.10", |
| "versionEndExcluding": "6.12" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/b6a638cb600e13f94b5464724eaa6ab7f3349ca2" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/e6ab336213918575124d6db43dc5d3554526242e" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/cf9ddf9ed94c15564a05bbf6e9f18dffa0c7df80" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/cf60d19d40184e43d9a624e55a0da73be09e938d" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/14841bb7a531b96e2dde37423a3b33e75147c60d" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/8165bf83b8a64be801d59cd2532b0d1ffed74d00" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/3d2530c65be04e93720e30f191a7cf1a3aa8b51c" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/13f8f1e05f1dc36dbba6cba0ae03354c0dafcde7" |
| } |
| ], |
| "title": "arm64: probes: Fix uprobes for big-endian kernels", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-50194", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
