| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE\n\ncopy_fd_bitmaps(new, old, count) is expected to copy the first\ncount/BITS_PER_LONG bits from old->full_fds_bits[] and fill\nthe rest with zeroes. What it does is copying enough words\n(BITS_TO_LONGS(count/BITS_PER_LONG)), then memsets the rest.\nThat works fine, *if* all bits past the cutoff point are\nclear. Otherwise we are risking garbage from the last word\nwe'd copied.\n\nFor most of the callers that is true - expand_fdtable() has\ncount equal to old->max_fds, so there's no open descriptors\npast count, let alone fully occupied words in ->open_fds[],\nwhich is what bits in ->full_fds_bits[] correspond to.\n\nThe other caller (dup_fd()) passes sane_fdtable_size(old_fdt, max_fds),\nwhich is the smallest multiple of BITS_PER_LONG that covers all\nopened descriptors below max_fds. In the common case (copying on\nfork()) max_fds is ~0U, so all opened descriptors will be below\nit and we are fine, by the same reasons why the call in expand_fdtable()\nis safe.\n\nUnfortunately, there is a case where max_fds is less than that\nand where we might, indeed, end up with junk in ->full_fds_bits[] -\nclose_range(from, to, CLOSE_RANGE_UNSHARE) with\n\t* descriptor table being currently shared\n\t* 'to' being above the current capacity of descriptor table\n\t* 'from' being just under some chunk of opened descriptors.\nIn that case we end up with observably wrong behaviour - e.g. spawn\na child with CLONE_FILES, get all descriptors in range 0..127 open,\nthen close_range(64, ~0U, CLOSE_RANGE_UNSHARE) and watch dup(0) ending\nup with descriptor #128, despite #64 being observably not open.\n\nThe minimally invasive fix would be to deal with that in dup_fd().\nIf this proves to add measurable overhead, we can go that way, but\nlet's try to fix copy_fd_bitmaps() first.\n\n* new helper: bitmap_copy_and_expand(to, from, bits_to_copy, size).\n* make copy_fd_bitmaps() take the bitmap size in words, rather than\nbits; it's 'count' argument is always a multiple of BITS_PER_LONG,\nso we are not losing any information, and that way we can use the\nsame helper for all three bitmaps - compiler will see that count\nis a multiple of BITS_PER_LONG for the large ones, so it'll generate\nplain memcpy()+memset().\n\nReproducer added to tools/testing/selftests/core/close_range_test.c" |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "fs/file.c", |
| "include/linux/bitmap.h", |
| "tools/testing/selftests/core/close_range_test.c" |
| ], |
| "versions": [ |
| { |
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| "lessThan": "ee501f827f3db02d4e599afbbc1a7f8b792d05d7", |
| "status": "affected", |
| "versionType": "git" |
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| "lessThan": "e807487a1d5fd5d941f26578ae826ca815dbfcd6", |
| "status": "affected", |
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| "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", |
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| }, |
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| "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", |
| "lessThan": "8cad3b2b3ab81ca55f37405ffd1315bcc2948058", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", |
| "lessThan": "dd72ae8b0fce9c0bbe9582b9b50820f0407f8d8a", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", |
| "lessThan": "c69d18f0ac7060de724511537810f10f29a27958", |
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| }, |
| { |
| "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", |
| "lessThan": "9a2fa1472083580b6c66bdaf291f591e1170123a", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "fs/file.c", |
| "include/linux/bitmap.h", |
| "tools/testing/selftests/core/close_range_test.c" |
| ], |
| "versions": [ |
| { |
| "version": "4.19.321", |
| "lessThanOrEqual": "4.19.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.283", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.225", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.166", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.1.107", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.48", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.10.7", |
| "lessThanOrEqual": "6.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.11", |
| "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:*:*:*:*:*:*:*:*", |
| "versionEndExcluding": "4.19.321" |
| }, |
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| "vulnerable": true, |
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| "versionEndExcluding": "6.11" |
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| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/ee501f827f3db02d4e599afbbc1a7f8b792d05d7" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/e807487a1d5fd5d941f26578ae826ca815dbfcd6" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/fe5bf14881701119aeeda7cf685f3c226c7380df" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/5053581fe5dfb09b58c65dd8462bf5dea71f41ff" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/8cad3b2b3ab81ca55f37405ffd1315bcc2948058" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/dd72ae8b0fce9c0bbe9582b9b50820f0407f8d8a" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/c69d18f0ac7060de724511537810f10f29a27958" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/9a2fa1472083580b6c66bdaf291f591e1170123a" |
| } |
| ], |
| "title": "fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-45025", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
