mirror of
https://github.com/CVEProject/cvelist.git
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129 lines
7.3 KiB
JSON
129 lines
7.3 KiB
JSON
{
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"data_version": "4.0",
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"data_type": "CVE",
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"data_format": "MITRE",
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"CVE_data_meta": {
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"ID": "CVE-2024-50250",
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"ASSIGNER": "cve@kernel.org",
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"STATE": "PUBLIC"
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},
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"description": {
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"description_data": [
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{
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"lang": "eng",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfsdax: dax_unshare_iter needs to copy entire blocks\n\nThe code that copies data from srcmap to iomap in dax_unshare_iter is\nvery very broken, which bfoster's recent fsx changes have exposed.\n\nIf the pos and len passed to dax_file_unshare are not aligned to an\nfsblock boundary, the iter pos and length in the _iter function will\nreflect this unalignment.\n\ndax_iomap_direct_access always returns a pointer to the start of the\nkmapped fsdax page, even if its pos argument is in the middle of that\npage. This is catastrophic for data integrity when iter->pos is not\naligned to a page, because daddr/saddr do not point to the same byte in\nthe file as iter->pos. Hence we corrupt user data by copying it to the\nwrong place.\n\nIf iter->pos + iomap_length() in the _iter function not aligned to a\npage, then we fail to copy a full block, and only partially populate the\ndestination block. This is catastrophic for data confidentiality\nbecause we expose stale pmem contents.\n\nFix both of these issues by aligning copy_pos/copy_len to a page\nboundary (remember, this is fsdax so 1 fsblock == 1 base page) so that\nwe always copy full blocks.\n\nWe're not done yet -- there's no call to invalidate_inode_pages2_range,\nso programs that have the file range mmap'd will continue accessing the\nold memory mapping after the file metadata updates have completed.\n\nBe careful with the return value -- if the unshare succeeds, we still\nneed to return the number of bytes that the iomap iter thinks we're\noperating on."
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}
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]
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},
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"problemtype": {
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"problemtype_data": [
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{
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"description": [
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{
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"lang": "eng",
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"value": "n/a"
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}
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]
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}
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]
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},
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"affects": {
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"vendor": {
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"vendor_data": [
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{
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"vendor_name": "Linux",
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"product": {
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"product_data": [
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{
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"product_name": "Linux",
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"version": {
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"version_data": [
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{
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"version_affected": "<",
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"version_name": "1bec6782a25c",
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"version_value": "bdbc96c23197"
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},
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{
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"version_affected": "<",
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"version_name": "d984648e428b",
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"version_value": "9bc18bb476e5"
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},
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{
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"version_value": "not down converted",
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"x_cve_json_5_version_data": {
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"versions": [
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{
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"version": "6.2",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.116",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.60",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.11.7",
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"lessThanOrEqual": "6.11.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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],
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"defaultStatus": "affected"
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}
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}
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]
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}
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}
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]
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}
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}
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]
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}
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},
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"references": {
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"reference_data": [
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{
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"url": "https://git.kernel.org/stable/c/bdbc96c23197d773a7d1bf03e4f11de593b0ff28",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/bdbc96c23197d773a7d1bf03e4f11de593b0ff28"
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},
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{
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"url": "https://git.kernel.org/stable/c/9bc18bb476e50e32e5d08f2734d63d63e0fa528c",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/9bc18bb476e50e32e5d08f2734d63d63e0fa528c"
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},
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{
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"url": "https://git.kernel.org/stable/c/8e9c0f500b42216ef930f5c0d1703989a451913d",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/8e9c0f500b42216ef930f5c0d1703989a451913d"
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},
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{
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"url": "https://git.kernel.org/stable/c/50793801fc7f6d08def48754fb0f0706b0cfc394",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/50793801fc7f6d08def48754fb0f0706b0cfc394"
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}
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]
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},
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"generator": {
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"engine": "bippy-8e903de6a542"
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}
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} |