{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2023-52759", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T15:19:24.237Z", "datePublished": "2024-05-21T15:30:45.773Z", "dateUpdated": "2024-11-04T14:52:08.262Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-04T14:52:08.262Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: ignore negated quota changes\n\nWhen lots of quota changes are made, there may be cases in which an\ninode's quota information is increased and then decreased, such as when\nblocks are added to a file, then deleted from it. If the timing is\nright, function do_qc can add pending quota changes to a transaction,\nthen later, another call to do_qc can negate those changes, resulting\nin a net gain of 0. The quota_change information is recorded in the qc\nbuffer (and qd element of the inode as well). The buffer is added to the\ntransaction by the first call to do_qc, but a subsequent call changes\nthe value from non-zero back to zero. At that point it's too late to\nremove the buffer_head from the transaction. Later, when the quota sync\ncode is called, the zero-change qd element is discovered and flagged as\nan assert warning. If the fs is mounted with errors=panic, the kernel\nwill panic.\n\nThis is usually seen when files are truncated and the quota changes are\nnegated by punch_hole/truncate which uses gfs2_quota_hold and\ngfs2_quota_unhold rather than block allocations that use gfs2_quota_lock\nand gfs2_quota_unlock which automatically do quota sync.\n\nThis patch solves the problem by adding a check to qd_check_sync such\nthat net-zero quota changes already added to the transaction are no\nlonger deemed necessary to be synced, and skipped.\n\nIn this case references are taken for the qd and the slot from do_qc\nso those need to be put. The normal sequence of events for a normal\nnon-zero quota change is as follows:\n\ngfs2_quota_change\n do_qc\n qd_hold\n slot_hold\n\nLater, when the changes are to be synced:\n\ngfs2_quota_sync\n qd_fish\n qd_check_sync\n gets qd ref via lockref_get_not_dead\n do_sync\n do_qc(QC_SYNC)\n qd_put\n\t lockref_put_or_lock\n qd_unlock\n qd_put\n lockref_put_or_lock\n\nIn the net-zero change case, we add a check to qd_check_sync so it puts\nthe qd and slot references acquired in gfs2_quota_change and skip the\nunneeded sync."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/gfs2/quota.c"], "versions": [{"version": "1da177e4c3f4", "lessThan": "1c28dace6601", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "b4deec69fe32", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "2bb42a27a92f", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "2a054b87a1b7", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "5bfda356e903", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "53fc16c1ad84", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "212f112fe5e9", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "119565e566f9", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "50e33567bc4a", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "4c6a08125f22", "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/gfs2/quota.c"], "versions": [{"version": "4.14.331", "lessThanOrEqual": 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"affected", "version": "1da177e4c3f4", "lessThan": "b4deec69fe32", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "2bb42a27a92f", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "2a054b87a1b7", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "5bfda356e903", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "53fc16c1ad84", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "212f112fe5e9", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "119565e566f9", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "50e33567bc4a", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "4c6a08125f22", "versionType": "git"}], "programFiles": ["fs/gfs2/quota.c"], "defaultStatus": "unaffected"}, {"repo": 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"semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.7", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/gfs2/quota.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/1c28dace66015b675a343b89b0c87abbfda05ff4"}, {"url": "https://git.kernel.org/stable/c/b4deec69fe32b58dc5fb4ace52456ece85b75561"}, {"url": "https://git.kernel.org/stable/c/2bb42a27a92ff3984c9fa5fbe128eced3ea693f2"}, {"url": "https://git.kernel.org/stable/c/2a054b87a1b799b391e578597a42ee6e57a987ae"}, {"url": "https://git.kernel.org/stable/c/5bfda356e903633d16ae1bac1ee38364e12628a3"}, {"url": "https://git.kernel.org/stable/c/53fc16c1ad84f5467ec24341670b63aa759335d3"}, {"url": "https://git.kernel.org/stable/c/212f112fe5e90e98eb8d48585682880dae139f4c"}, {"url": "https://git.kernel.org/stable/c/119565e566f91ff3588ffcd5812f0c8061586c6b"}, {"url": "https://git.kernel.org/stable/c/50e33567bc4a1c4ed79a1d289fe93c9a26491848"}, {"url": "https://git.kernel.org/stable/c/4c6a08125f2249531ec01783a5f4317d7342add5"}], "x_generator": {"engine": "bippy-9e1c9544281a"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: ignore negated quota changes\n\nWhen lots of quota changes are made, there may be cases in which an\ninode's quota information is increased and then decreased, such as when\nblocks are added to a file, then deleted from it. If the timing is\nright, function do_qc can add pending quota changes to a transaction,\nthen later, another call to do_qc can negate those changes, resulting\nin a net gain of 0. The quota_change information is recorded in the qc\nbuffer (and qd element of the inode as well). The buffer is added to the\ntransaction by the first call to do_qc, but a subsequent call changes\nthe value from non-zero back to zero. At that point it's too late to\nremove the buffer_head from the transaction. Later, when the quota sync\ncode is called, the zero-change qd element is discovered and flagged as\nan assert warning. If the fs is mounted with errors=panic, the kernel\nwill panic.\n\nThis is usually seen when files are truncated and the quota changes are\nnegated by punch_hole/truncate which uses gfs2_quota_hold and\ngfs2_quota_unhold rather than block allocations that use gfs2_quota_lock\nand gfs2_quota_unlock which automatically do quota sync.\n\nThis patch solves the problem by adding a check to qd_check_sync such\nthat net-zero quota changes already added to the transaction are no\nlonger deemed necessary to be synced, and skipped.\n\nIn this case references are taken for the qd and the slot from do_qc\nso those need to be put. The normal sequence of events for a normal\nnon-zero quota change is as follows:\n\ngfs2_quota_change\n do_qc\n qd_hold\n slot_hold\n\nLater, when the changes are to be synced:\n\ngfs2_quota_sync\n qd_fish\n qd_check_sync\n gets qd ref via lockref_get_not_dead\n do_sync\n do_qc(QC_SYNC)\n qd_put\n\t lockref_put_or_lock\n qd_unlock\n qd_put\n lockref_put_or_lock\n\nIn the net-zero change case, we add a check to qd_check_sync so it puts\nthe qd and slot references acquired in gfs2_quota_change and skip the\nunneeded sync."}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-04T14:52:08.262Z"}}}, "cveMetadata": {"cveId": "CVE-2023-52759", "state": "PUBLISHED", "dateUpdated": "2024-11-04T14:52:08.262Z", "dateReserved": "2024-05-21T15:19:24.237Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:30:45.773Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: ignore negated quota changes\n\nWhen lots of quota changes are made, there may be cases in which an\ninode's quota information is increased and then decreased, such as when\nblocks are added to a file, then deleted from it. If the timing is\nright, function do_qc can add pending quota changes to a transaction,\nthen later, another call to do_qc can negate those changes, resulting\nin a net gain of 0. The quota_change information is recorded in the qc\nbuffer (and qd element of the inode as well). The buffer is added to the\ntransaction by the first call to do_qc, but a subsequent call changes\nthe value from non-zero back to zero. At that point it's too late to\nremove the buffer_head from the transaction. Later, when the quota sync\ncode is called, the zero-change qd element is discovered and flagged as\nan assert warning. If the fs is mounted with errors=panic, the kernel\nwill panic.\n\nThis is usually seen when files are truncated and the quota changes are\nnegated by punch_hole/truncate which uses gfs2_quota_hold and\ngfs2_quota_unhold rather than block allocations that use gfs2_quota_lock\nand gfs2_quota_unlock which automatically do quota sync.\n\nThis patch solves the problem by adding a check to qd_check_sync such\nthat net-zero quota changes already added to the transaction are no\nlonger deemed necessary to be synced, and skipped.\n\nIn this case references are taken for the qd and the slot from do_qc\nso those need to be put. The normal sequence of events for a normal\nnon-zero quota change is as follows:\n\ngfs2_quota_change\n do_qc\n qd_hold\n slot_hold\n\nLater, when the changes are to be synced:\n\ngfs2_quota_sync\n qd_fish\n qd_check_sync\n gets qd ref via lockref_get_not_dead\n do_sync\n do_qc(QC_SYNC)\n qd_put\n\t lockref_put_or_lock\n qd_unlock\n qd_put\n lockref_put_or_lock\n\nIn the net-zero change case, we add a check to qd_check_sync so it puts\nthe qd and slot references acquired in gfs2_quota_change and skip the\nunneeded sync."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gfs2: ignora los cambios de cuota negados. Cuando se realizan muchos cambios de cuota, puede haber casos en los que la informaci\u00f3n de cuota de un inodo aumenta y luego disminuye, como cuando se agregan bloques a un archivo, luego eliminado de \u00e9l. Si es el momento adecuado, la funci\u00f3n do_qc puede agregar cambios de cuota pendientes a una transacci\u00f3n, luego, otra llamada a do_qc puede negar esos cambios, lo que resulta en una ganancia neta de 0. La informaci\u00f3n de cuota_cambio se registra en el b\u00fafer qc (y en el elemento qd). del inodo tambi\u00e9n). El b\u00fafer se agrega a la transacci\u00f3n mediante la primera llamada a do_qc, pero una llamada posterior cambia el valor de distinto de cero a cero. En ese momento ya es demasiado tarde para eliminar buffer_head de la transacci\u00f3n. M\u00e1s tarde, cuando se llama al c\u00f3digo de sincronizaci\u00f3n de cuota, el elemento qd de cambio cero se descubre y se marca como una advertencia de afirmaci\u00f3n. Si fs se monta con errores = p\u00e1nico, el kernel entrar\u00e1 en p\u00e1nico. Esto generalmente se ve cuando los archivos se truncan y los cambios de cuota se niegan mediante punch_hole/truncate, que usa gfs2_quota_hold y gfs2_quota_unhold en lugar de bloquear asignaciones que usan gfs2_quota_lock y gfs2_quota_unlock, que sincronizan autom\u00e1ticamente la cuota. Este parche resuelve el problema agregando una verificaci\u00f3n a qd_check_sync de modo que los cambios de cuota neta cero ya agregados a la transacci\u00f3n ya no se consideren necesarios para sincronizarse y omitirse. En este caso, se toman referencias para el qd y el slot de do_qc, por lo que es necesario ponerlas. La secuencia normal de eventos para un cambio de cuota normal distinto de cero es la siguiente: gfs2_quota_change do_qc qd_hold slot_hold M\u00e1s tarde, cuando se van a sincronizar los cambios: gfs2_quota_sync qd_fish qd_check_sync obtiene qd ref mediante lockref_get_not_dead do_sync do_qc(QC_SYNC) qd_put lockref_put_or_lock qd_unlock qd_put lockref_put_or_lock En el caso de cambio neto cero, agregamos una verificaci\u00f3n a qd_check_sync para que coloque las referencias de qd y slot adquiridas en gfs2_quota_change y omita la sincronizaci\u00f3n innecesaria."}], "id": "CVE-2023-52759", "lastModified": "2024-10-17T14:15:04.647", "metrics": {}, "published": "2024-05-21T16:15:15.330", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/119565e566f91ff3588ffcd5812f0c8061586c6b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1c28dace66015b675a343b89b0c87abbfda05ff4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/212f112fe5e90e98eb8d48585682880dae139f4c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2a054b87a1b799b391e578597a42ee6e57a987ae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2bb42a27a92ff3984c9fa5fbe128eced3ea693f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4c6a08125f2249531ec01783a5f4317d7342add5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/50e33567bc4a1c4ed79a1d289fe93c9a26491848"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/53fc16c1ad84f5467ec24341670b63aa759335d3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5bfda356e903633d16ae1bac1ee38364e12628a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b4deec69fe32b58dc5fb4ace52456ece85b75561"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: gfs2: ignore negated quota changes", "id": "2282666", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282666"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ngfs2: ignore negated quota changes\nWhen lots of quota changes are made, there may be cases in which an\ninode's quota information is increased and then decreased, such as when\nblocks are added to a file, then deleted from it. If the timing is\nright, function do_qc can add pending quota changes to a transaction,\nthen later, another call to do_qc can negate those changes, resulting\nin a net gain of 0. The quota_change information is recorded in the qc\nbuffer (and qd element of the inode as well). The buffer is added to the\ntransaction by the first call to do_qc, but a subsequent call changes\nthe value from non-zero back to zero. At that point it's too late to\nremove the buffer_head from the transaction. Later, when the quota sync\ncode is called, the zero-change qd element is discovered and flagged as\nan assert warning. If the fs is mounted with errors=panic, the kernel\nwill panic.\nThis is usually seen when files are truncated and the quota changes are\nnegated by punch_hole/truncate which uses gfs2_quota_hold and\ngfs2_quota_unhold rather than block allocations that use gfs2_quota_lock\nand gfs2_quota_unlock which automatically do quota sync.\nThis patch solves the problem by adding a check to qd_check_sync such\nthat net-zero quota changes already added to the transaction are no\nlonger deemed necessary to be synced, and skipped.\nIn this case references are taken for the qd and the slot from do_qc\nso those need to be put. The normal sequence of events for a normal\nnon-zero quota change is as follows:\ngfs2_quota_change\ndo_qc\nqd_hold\nslot_hold\nLater, when the changes are to be synced:\ngfs2_quota_sync\nqd_fish\nqd_check_sync\ngets qd ref via lockref_get_not_dead\ndo_sync\ndo_qc(QC_SYNC)\nqd_put\nlockref_put_or_lock\nqd_unlock\nqd_put\nlockref_put_or_lock\nIn the net-zero change case, we add a check to qd_check_sync so it puts\nthe qd and slot references acquired in gfs2_quota_change and skip the\nunneeded sync."], "name": "CVE-2023-52759", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52759\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52759\nhttps://lore.kernel.org/linux-cve-announce/2024052147-CVE-2023-52759-0e9f@gregkh/T"], "threat_severity": "Moderate", "upstream_fix": "kernel 4.14.331, kernel 4.19.300, kernel 5.4.262, kernel 5.10.202, kernel 5.15.140, kernel 6.1.64, kernel 6.5.13, kernel 6.6.3, kernel 6.7"}