| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: process: Fix kernel gp leakage\n\nchildregs represents the registers which are active for the new thread\nin user context. For a kernel thread, childregs->gp is never used since\nthe kernel gp is not touched by switch_to. For a user mode helper, the\ngp value can be observed in user space after execve or possibly by other\nmeans.\n\n[From the email thread]\n\nThe /* Kernel thread */ comment is somewhat inaccurate in that it is also used\nfor user_mode_helper threads, which exec a user process, e.g. /sbin/init or\nwhen /proc/sys/kernel/core_pattern is a pipe. Such threads do not have\nPF_KTHREAD set and are valid targets for ptrace etc. even before they exec.\n\nchildregs is the *user* context during syscall execution and it is observable\nfrom userspace in at least five ways:\n\n1. kernel_execve does not currently clear integer registers, so the starting\n register state for PID 1 and other user processes started by the kernel has\n sp = user stack, gp = kernel __global_pointer$, all other integer registers\n zeroed by the memset in the patch comment.\n\n This is a bug in its own right, but I'm unwilling to bet that it is the only\n way to exploit the issue addressed by this patch.\n\n2. ptrace(PTRACE_GETREGSET): you can PTRACE_ATTACH to a user_mode_helper thread\n before it execs, but ptrace requires SIGSTOP to be delivered which can only\n happen at user/kernel boundaries.\n\n3. /proc/*/task/*/syscall: this is perfectly happy to read pt_regs for\n user_mode_helpers before the exec completes, but gp is not one of the\n registers it returns.\n\n4. PERF_SAMPLE_REGS_USER: LOCKDOWN_PERF normally prevents access to kernel\n addresses via PERF_SAMPLE_REGS_INTR, but due to this bug kernel addresses\n are also exposed via PERF_SAMPLE_REGS_USER which is permitted under\n LOCKDOWN_PERF. I have not attempted to write exploit code.\n\n5. Much of the tracing infrastructure allows access to user registers. I have\n not attempted to determine which forms of tracing allow access to user\n registers without already allowing access to kernel registers." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "arch/riscv/kernel/process.c" |
| ], |
| "versions": [ |
| { |
| "version": "7db91e57a0acde126a162ababfb1e0ab190130cb", |
| "lessThan": "9abc3e6f1116adb7a2d4fbb8ce20c37916976bf5", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "7db91e57a0acde126a162ababfb1e0ab190130cb", |
| "lessThan": "dff6072124f6df77bfd36951fbd88565746980ef", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "7db91e57a0acde126a162ababfb1e0ab190130cb", |
| "lessThan": "f6583444d7e78dae750798552b65a2519ff3ca84", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "7db91e57a0acde126a162ababfb1e0ab190130cb", |
| "lessThan": "00effef72c98294edb1efa87ffa0f6cfb61b36a4", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "7db91e57a0acde126a162ababfb1e0ab190130cb", |
| "lessThan": "d8dcba0691b8e42bddb61aab201e4d918a08e5d9", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "7db91e57a0acde126a162ababfb1e0ab190130cb", |
| "lessThan": "d14fa1fcf69db9d070e75f1c4425211fa619dfc8", |
| "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/riscv/kernel/process.c" |
| ], |
| "versions": [ |
| { |
| "version": "4.15", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "4.15", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.216", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.154", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.1.85", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.26", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.8.5", |
| "lessThanOrEqual": "6.8.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.9", |
| "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": "4.15", |
| "versionEndExcluding": "5.10.216" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.15", |
| "versionEndExcluding": "5.15.154" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.15", |
| "versionEndExcluding": "6.1.85" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.15", |
| "versionEndExcluding": "6.6.26" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.15", |
| "versionEndExcluding": "6.8.5" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.15", |
| "versionEndExcluding": "6.9" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/9abc3e6f1116adb7a2d4fbb8ce20c37916976bf5" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/dff6072124f6df77bfd36951fbd88565746980ef" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/f6583444d7e78dae750798552b65a2519ff3ca84" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/00effef72c98294edb1efa87ffa0f6cfb61b36a4" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/d8dcba0691b8e42bddb61aab201e4d918a08e5d9" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/d14fa1fcf69db9d070e75f1c4425211fa619dfc8" |
| } |
| ], |
| "title": "riscv: process: Fix kernel gp leakage", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-35871", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
