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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclass: fix possible memory leak in __class_register()\n\nIf class_add_groups() returns error, the \u0027cp-\u003esubsys\u0027 need be\nunregister, and the \u0027cp\u0027 need be freed.\n\nWe can not call kset_unregister() here, because the \u0027cls\u0027 will\nbe freed in callback function class_release() and it\u0027s also\nfreed in caller\u0027s error path, it will cause double free.\n\nSo fix this by calling kobject_del() and kfree_const(name) to\ncleanup kobject. Besides, call kfree() to free the \u0027cp\u0027.\n\nFault injection test can trigger this:\n\nunreferenced object 0xffff888102fa8190 (size 8):\n  comm \"modprobe\", pid 502, jiffies 4294906074 (age 49.296s)\n  hex dump (first 8 bytes):\n    70 6b 74 63 64 76 64 00                          pktcdvd.\n  backtrace:\n    [\u003c00000000e7c7703d\u003e] __kmalloc_track_caller+0x1ae/0x320\n    [\u003c000000005e4d70bc\u003e] kstrdup+0x3a/0x70\n    [\u003c00000000c2e5e85a\u003e] kstrdup_const+0x68/0x80\n    [\u003c000000000049a8c7\u003e] kvasprintf_const+0x10b/0x190\n    [\u003c0000000029123163\u003e] kobject_set_name_vargs+0x56/0x150\n    [\u003c00000000747219c9\u003e] kobject_set_name+0xab/0xe0\n    [\u003c0000000005f1ea4e\u003e] __class_register+0x15c/0x49a\n\nunreferenced object 0xffff888037274000 (size 1024):\n  comm \"modprobe\", pid 502, jiffies 4294906074 (age 49.296s)\n  hex dump (first 32 bytes):\n    00 40 27 37 80 88 ff ff 00 40 27 37 80 88 ff ff  .@\u00277.....@\u00277....\n    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........\n  backtrace:\n    [\u003c00000000151f9600\u003e] kmem_cache_alloc_trace+0x17c/0x2f0\n    [\u003c00000000ecf3dd95\u003e] __class_register+0x86/0x49a"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: don\u0027t free qgroup space unless specified\n\nBoris noticed in his simple quotas testing that he was getting a leak\nwith Sweet Tea\u0027s change to subvol create that stopped doing a\ntransaction commit.  This was just a side effect of that change.\n\nIn the delayed inode code we have an optimization that will free extra\nreservations if we think we can pack a dir item into an already modified\nleaf.  Previously this wouldn\u0027t be triggered in the subvolume create\ncase because we\u0027d commit the transaction, it was still possible but\nmuch harder to trigger.  It could actually be triggered if we did a\nmkdir \u0026\u0026 subvol create with qgroups enabled.\n\nThis occurs because in btrfs_insert_delayed_dir_index(), which gets\ncalled when we\u0027re adding the dir item, we do the following:\n\n  btrfs_block_rsv_release(fs_info, trans-\u003eblock_rsv, bytes, NULL);\n\nif we\u0027re able to skip reserving space.\n\nThe problem here is that trans-\u003eblock_rsv points at the temporary block\nrsv for the subvolume create, which has qgroup reservations in the block\nrsv.\n\nThis is a problem because btrfs_block_rsv_release() will do the\nfollowing:\n\n  if (block_rsv-\u003eqgroup_rsv_reserved \u003e= block_rsv-\u003eqgroup_rsv_size) {\n\t  qgroup_to_release = block_rsv-\u003eqgroup_rsv_reserved -\n\t\t  block_rsv-\u003eqgroup_rsv_size;\n\t  block_rsv-\u003eqgroup_rsv_reserved = block_rsv-\u003eqgroup_rsv_size;\n  }\n\nThe temporary block rsv just has -\u003eqgroup_rsv_reserved set,\n-\u003eqgroup_rsv_size == 0.  The optimization in\nbtrfs_insert_delayed_dir_index() sets -\u003eqgroup_rsv_reserved = 0.  Then\nlater on when we call btrfs_subvolume_release_metadata() which has\n\n  btrfs_block_rsv_release(fs_info, rsv, (u64)-1, \u0026qgroup_to_release);\n  btrfs_qgroup_convert_reserved_meta(root, qgroup_to_release);\n\nqgroup_to_release is set to 0, and we do not convert the reserved\nmetadata space.\n\nThe problem here is that the block rsv code has been unconditionally\nmessing with -\u003eqgroup_rsv_reserved, because the main place this is used\nis delalloc, and any time we call btrfs_block_rsv_release() we do it\nwith qgroup_to_release set, and thus do the proper accounting.\n\nThe subvolume code is the only other code that uses the qgroup\nreservation stuff, but it\u0027s intermingled with the above optimization,\nand thus was getting its reservation freed out from underneath it and\nthus leaking the reserved space.\n\nThe solution is to simply not mess with the qgroup reservations if we\ndon\u0027t have qgroup_to_release set.  This works with the existing code as\nanything that messes with the delalloc reservations always have\nqgroup_to_release set.  This fixes the leak that Boris was observing."
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: handle case when repair happens with dev-replace\n\n[BUG]\nThere is a bug report that a BUG_ON() in btrfs_repair_io_failure()\n(originally repair_io_failure() in v6.0 kernel) got triggered when\nreplacing a unreliable disk:\n\n  BTRFS warning (device sda1): csum failed root 257 ino 2397453 off 39624704 csum 0xb0d18c75 expected csum 0x4dae9c5e mirror 3\n  kernel BUG at fs/btrfs/extent_io.c:2380!\n  invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\n  CPU: 9 PID: 3614331 Comm: kworker/u257:2 Tainted: G           OE      6.0.0-5-amd64 #1  Debian 6.0.10-2\n  Hardware name: Micro-Star International Co., Ltd. MS-7C60/TRX40 PRO WIFI (MS-7C60), BIOS 2.70 07/01/2021\n  Workqueue: btrfs-endio btrfs_end_bio_work [btrfs]\n  RIP: 0010:repair_io_failure+0x24a/0x260 [btrfs]\n  Call Trace:\n   \u003cTASK\u003e\n   clean_io_failure+0x14d/0x180 [btrfs]\n   end_bio_extent_readpage+0x412/0x6e0 [btrfs]\n   ? __switch_to+0x106/0x420\n   process_one_work+0x1c7/0x380\n   worker_thread+0x4d/0x380\n   ? rescuer_thread+0x3a0/0x3a0\n   kthread+0xe9/0x110\n   ? kthread_complete_and_exit+0x20/0x20\n   ret_from_fork+0x22/0x30\n\n[CAUSE]\n\nBefore the BUG_ON(), we got some read errors from the replace target\nfirst, note the mirror number (3, which is beyond RAID1 duplication,\nthus it\u0027s read from the replace target device).\n\nThen at the BUG_ON() location, we are trying to writeback the repaired\nsectors back the failed device.\n\nThe check looks like this:\n\n\t\tret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical,\n\t\t\t\t      \u0026map_length, \u0026bioc, mirror_num);\n\t\tif (ret)\n\t\t\tgoto out_counter_dec;\n\t\tBUG_ON(mirror_num != bioc-\u003emirror_num);\n\nBut inside btrfs_map_block(), we can modify bioc-\u003emirror_num especially\nfor dev-replace:\n\n\tif (dev_replace_is_ongoing \u0026\u0026 mirror_num == map-\u003enum_stripes + 1 \u0026\u0026\n\t    !need_full_stripe(op) \u0026\u0026 dev_replace-\u003etgtdev != NULL) {\n\t\tret = get_extra_mirror_from_replace(fs_info, logical, *length,\n\t\t\t\t\t\t    dev_replace-\u003esrcdev-\u003edevid,\n\t\t\t\t\t\t    \u0026mirror_num,\n\t\t\t\t\t    \u0026physical_to_patch_in_first_stripe);\n\t\tpatch_the_first_stripe_for_dev_replace = 1;\n\t}\n\nThus if we\u0027re repairing the replace target device, we\u0027re going to\ntrigger that BUG_ON().\n\nBut in reality, the read failure from the replace target device may be\nthat, our replace hasn\u0027t reached the range we\u0027re reading, thus we\u0027re\nreading garbage, but with replace running, the range would be properly\nfilled later.\n\nThus in that case, we don\u0027t need to do anything but let the replace\nroutine to handle it.\n\n[FIX]\nInstead of a BUG_ON(), just skip the repair if we\u0027re repairing the\ndevice replace target device."
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix racy bitfield write in btrfs_clear_space_info_full()\n\nFrom the memory-barriers.txt document regarding memory barrier ordering\nguarantees:\n\n (*) These guarantees do not apply to bitfields, because compilers often\n     generate code to modify these using non-atomic read-modify-write\n     sequences.  Do not attempt to use bitfields to synchronize parallel\n     algorithms.\n\n (*) Even in cases where bitfields are protected by locks, all fields\n     in a given bitfield must be protected by one lock.  If two fields\n     in a given bitfield are protected by different locks, the compiler\u0027s\n     non-atomic read-modify-write sequences can cause an update to one\n     field to corrupt the value of an adjacent field.\n\nbtrfs_space_info has a bitfield sharing an underlying word consisting of\nthe fields full, chunk_alloc, and flush:\n\nstruct btrfs_space_info {\n        struct btrfs_fs_info *     fs_info;              /*     0     8 */\n        struct btrfs_space_info *  parent;               /*     8     8 */\n        ...\n        int                        clamp;                /*   172     4 */\n        unsigned int               full:1;               /*   176: 0  4 */\n        unsigned int               chunk_alloc:1;        /*   176: 1  4 */\n        unsigned int               flush:1;              /*   176: 2  4 */\n        ...\n\nTherefore, to be safe from parallel read-modify-writes losing a write to\none of the bitfield members protected by a lock, all writes to all the\nbitfields must use the lock. They almost universally do, except for\nbtrfs_clear_space_info_full() which iterates over the space_infos and\nwrites out found-\u003efull = 0 without a lock.\n\nImagine that we have one thread completing a transaction in which we\nfinished deleting a block_group and are thus calling\nbtrfs_clear_space_info_full() while simultaneously the data reclaim\nticket infrastructure is running do_async_reclaim_data_space():\n\n          T1                                             T2\nbtrfs_commit_transaction\n  btrfs_clear_space_info_full\n  data_sinfo-\u003efull = 0\n  READ: full:0, chunk_alloc:0, flush:1\n                                              do_async_reclaim_data_space(data_sinfo)\n                                              spin_lock(\u0026space_info-\u003elock);\n                                              if(list_empty(tickets))\n                                                space_info-\u003eflush = 0;\n                                                READ: full: 0, chunk_alloc:0, flush:1\n                                                MOD/WRITE: full: 0, chunk_alloc:0, flush:0\n                                                spin_unlock(\u0026space_info-\u003elock);\n                                                return;\n  MOD/WRITE: full:0, chunk_alloc:0, flush:1\n\nand now data_sinfo-\u003eflush is 1 but the reclaim worker has exited. This\nbreaks the invariant that flush is 0 iff there is no work queued or\nrunning. Once this invariant is violated, future allocations that go\ninto __reserve_bytes() will add tickets to space_info-\u003etickets but will\nsee space_info-\u003eflush is set to 1 and not queue the work. After this,\nthey will block forever on the resulting ticket, as it is now impossible\nto kick the worker again.\n\nI also confirmed by looking at the assembly of the affected kernel that\nit is doing RMW operations. For example, to set the flush (3rd) bit to 0,\nthe assembly is:\n  andb    $0xfb,0x60(%rbx)\nand similarly for setting the full (1st) bit to 0:\n  andb    $0xfe,-0x20(%rax)\n\nSo I think this is really a bug on practical systems.  I have observed\na number of systems in this exact state, but am currently unable to\nreproduce it.\n\nRather than leaving this footgun lying around for the future, take\nadvantage of the fact that there is room in the struct anyway, and that\nit is already quite large and simply change the three bitfield members to\nbools. This avoids writes to space_info-\u003efull having any effect on\n---truncated---"
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          "url": "https://git.kernel.org/stable/c/38e818718c5e04961eea0fa8feff3f100ce40408"
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      "title": "btrfs: fix racy bitfield write in btrfs_clear_space_info_full()",
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