{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2023-52759", "ASSIGNER": "cve@kernel.org", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "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." } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Linux", "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "<", "version_name": "1da177e4c3f4", "version_value": "1c28dace6601" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "4.14.331", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "custom" }, { "version": "4.19.300", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.4.262", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.10.202", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.140", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.1.64", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.5.13", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.6.3", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.6.57", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.7", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ], "defaultStatus": "affected" } } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://git.kernel.org/stable/c/1c28dace66015b675a343b89b0c87abbfda05ff4", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/1c28dace66015b675a343b89b0c87abbfda05ff4" }, { "url": "https://git.kernel.org/stable/c/b4deec69fe32b58dc5fb4ace52456ece85b75561", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/b4deec69fe32b58dc5fb4ace52456ece85b75561" }, { "url": "https://git.kernel.org/stable/c/2bb42a27a92ff3984c9fa5fbe128eced3ea693f2", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/2bb42a27a92ff3984c9fa5fbe128eced3ea693f2" }, { "url": "https://git.kernel.org/stable/c/2a054b87a1b799b391e578597a42ee6e57a987ae", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/2a054b87a1b799b391e578597a42ee6e57a987ae" }, { "url": "https://git.kernel.org/stable/c/5bfda356e903633d16ae1bac1ee38364e12628a3", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/5bfda356e903633d16ae1bac1ee38364e12628a3" }, { "url": "https://git.kernel.org/stable/c/53fc16c1ad84f5467ec24341670b63aa759335d3", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/53fc16c1ad84f5467ec24341670b63aa759335d3" }, { "url": "https://git.kernel.org/stable/c/212f112fe5e90e98eb8d48585682880dae139f4c", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/212f112fe5e90e98eb8d48585682880dae139f4c" }, { "url": "https://git.kernel.org/stable/c/119565e566f91ff3588ffcd5812f0c8061586c6b", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/119565e566f91ff3588ffcd5812f0c8061586c6b" }, { "url": "https://git.kernel.org/stable/c/50e33567bc4a1c4ed79a1d289fe93c9a26491848", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/50e33567bc4a1c4ed79a1d289fe93c9a26491848" }, { "url": "https://git.kernel.org/stable/c/4c6a08125f2249531ec01783a5f4317d7342add5", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/4c6a08125f2249531ec01783a5f4317d7342add5" } ] }, "generator": { "engine": "bippy-c9c4e1df01b2" } }