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[PATCH OLK-6.6] ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read
by Long Li 31 Dec '24

31 Dec '24

From: Jordy Zomer <jordyzomer(a)google.com> mainline inclusion from mainline-v6.10-rc2 commit fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEAPD CVE: CVE-2024-56627 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- An offset from client could be a negative value, It could lead to an out-of-bounds read from the stream_buf. Note that this issue is coming when setting 'vfs objects = streams_xattr parameter' in ksmbd.conf. Cc: stable(a)vger.kernel.org # v5.15+ Reported-by: Jordy Zomer <jordyzomer(a)google.com> Signed-off-by: Jordy Zomer <jordyzomer(a)google.com> Signed-off-by: Namjae Jeon <linkinjeon(a)kernel.org> Signed-off-by: Steve French <stfrench(a)microsoft.com> Signed-off-by: Long Li <leo.lilong(a)huawei.com> --- fs/smb/server/smb2pdu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c index a080f80256cb..8bb70efc7899 100644 --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -6653,6 +6653,10 @@ int smb2_read(struct ksmbd_work *work) } offset = le64_to_cpu(req->Offset); + if (offset < 0) { + err = -EINVAL; + goto out; + } length = le32_to_cpu(req->Length); mincount = le32_to_cpu(req->MinimumCount); -- 2.39.2

2 5

[PATCH openEuler-22.03-LTS-SP1] ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read
by Long Li 31 Dec '24

31 Dec '24

From: Jordy Zomer <jordyzomer(a)google.com> mainline inclusion from mainline-v6.10-rc2 commit fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEAPD CVE: CVE-2024-56627 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- An offset from client could be a negative value, It could lead to an out-of-bounds read from the stream_buf. Note that this issue is coming when setting 'vfs objects = streams_xattr parameter' in ksmbd.conf. Cc: stable(a)vger.kernel.org # v5.15+ Reported-by: Jordy Zomer <jordyzomer(a)google.com> Signed-off-by: Jordy Zomer <jordyzomer(a)google.com> Signed-off-by: Namjae Jeon <linkinjeon(a)kernel.org> Signed-off-by: Steve French <stfrench(a)microsoft.com> Conflicts: fs/ksmbd/smb2pdu.c fs/smb/server/smb2pdu.c [Conflicts due to ksmbd rename to smb/server] Signed-off-by: Long Li <leo.lilong(a)huawei.com> --- fs/ksmbd/smb2pdu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index f104de64493b..b6194837028a 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -6319,6 +6319,10 @@ int smb2_read(struct ksmbd_work *work) } offset = le64_to_cpu(req->Offset); + if (offset < 0) { + err = -EINVAL; + goto out; + } length = le32_to_cpu(req->Length); mincount = le32_to_cpu(req->MinimumCount); -- 2.39.2

2 5

[PATCH OLK-5.10] ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read
by Long Li 31 Dec '24

31 Dec '24

From: Jordy Zomer <jordyzomer(a)google.com> mainline inclusion from mainline-v6.10-rc2 commit fc342cf86e2dc4d2edb0fc2ff5e28b6c7845adb9 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEAPD CVE: CVE-2024-56627 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- An offset from client could be a negative value, It could lead to an out-of-bounds read from the stream_buf. Note that this issue is coming when setting 'vfs objects = streams_xattr parameter' in ksmbd.conf. Cc: stable(a)vger.kernel.org # v5.15+ Reported-by: Jordy Zomer <jordyzomer(a)google.com> Signed-off-by: Jordy Zomer <jordyzomer(a)google.com> Signed-off-by: Namjae Jeon <linkinjeon(a)kernel.org> Signed-off-by: Steve French <stfrench(a)microsoft.com> Conflicts: fs/ksmbd/smb2pdu.c fs/smb/server/smb2pdu.c [Conflicts due to ksmbd rename to smb/server] Signed-off-by: Long Li <leo.lilong(a)huawei.com> --- fs/ksmbd/smb2pdu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index f104de64493b..b6194837028a 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -6319,6 +6319,10 @@ int smb2_read(struct ksmbd_work *work) } offset = le64_to_cpu(req->Offset); + if (offset < 0) { + err = -EINVAL; + goto out; + } length = le32_to_cpu(req->Length); mincount = le32_to_cpu(req->MinimumCount); -- 2.39.2

2 5

[openeuler:OLK-5.10 2610/2610] mm/vmscan.c:4737 get_swapcache_reclaim_num() warn: unsigned 'swapcache_watermark[0]' is never less than zero.
by kernel test robot 31 Dec '24

31 Dec '24

tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: 2a9b96eb97cfd6f68e431cb614cb0b75b127d783 commit: abfd8691d951fb037506e1ee52ed39abee8430fa [2610/2610] etmem: add swapcache reclaim to etmem config: x86_64-randconfig-161-20241231 (https://download.01.org/0day-ci/archive/20241231/202412311538.MIuGFM8n-lkp@…) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202412311538.MIuGFM8n-lkp@intel.com/ smatch warnings: mm/vmscan.c:4737 get_swapcache_reclaim_num() warn: unsigned 'swapcache_watermark[0]' is never less than zero. vim +4737 mm/vmscan.c 4733 4734 static unsigned long get_swapcache_reclaim_num(unsigned long *swapcache_watermark) 4735 { 4736 return total_swapcache_pages() > > 4737 swapcache_watermark[ETMEM_SWAPCACHE_WMARK_LOW] ? 4738 (total_swapcache_pages() - swapcache_watermark[ETMEM_SWAPCACHE_WMARK_LOW]) : 0; 4739 } 4740 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

1 0

[PATCH OLK-6.6 v2] drm/nouveau/gr/gf100: Fix missing unlock in gf100_gr_chan_new()
by Ye Bin 31 Dec '24

31 Dec '24

From: Li Huafei <lihuafei1(a)huawei.com> stable inclusion from stable-v6.6.64 commit 237f2dbfa00576bb1aa8dc2dce403c64e53270e6 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEGFJ CVE: CVE-2024-56752 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit a2f599046c671d6b46d93aed95b37241ce4504cf ] When the call to gf100_grctx_generate() fails, unlock gr->fecs.mutex before returning the error. Fixes smatch warning: drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c:480 gf100_gr_chan_new() warn: inconsistent returns '&gr->fecs.mutex'. Fixes: ca081fff6ecc ("drm/nouveau/gr/gf100-: generate golden context during first object alloc") Signed-off-by: Li Huafei <lihuafei1(a)huawei.com> Reviewed-by: Lyude Paul <lyude(a)redhat.com> Signed-off-by: Lyude Paul <lyude(a)redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20241026173844.2392679-1-lihu… Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Ye Bin <yebin10(a)huawei.com> --- drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c b/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c index 3648868bb9fc..cd533d16b966 100644 --- a/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c +++ b/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c @@ -443,6 +443,7 @@ gf100_gr_chan_new(struct nvkm_gr *base, struct nvkm_chan *fifoch, ret = gf100_grctx_generate(gr, chan, fifoch->inst); if (ret) { nvkm_error(&base->engine.subdev, "failed to construct context\n"); + mutex_unlock(&gr->fecs.mutex); return ret; } } -- 2.34.1

2 5

[PATCH OLK-6.6 v2] EDAC/igen6: Avoid segmentation fault on module unload
by Ye Bin 31 Dec '24

31 Dec '24

From: Orange Kao <orange(a)aiven.io> stable inclusion from stable-v6.6.64 commit 830cabb61113d92a425dd3038ccedbdfb3c8d079 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEDPH CVE: CVE-2024-56708 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit fefaae90398d38a1100ccd73b46ab55ff4610fba ] The segmentation fault happens because: During modprobe: 1. In igen6_probe(), igen6_pvt will be allocated with kzalloc() 2. In igen6_register_mci(), mci->pvt_info will point to &igen6_pvt->imc[mc] During rmmod: 1. In mci_release() in edac_mc.c, it will kfree(mci->pvt_info) 2. In igen6_remove(), it will kfree(igen6_pvt); Fix this issue by setting mci->pvt_info to NULL to avoid the double kfree. Fixes: 10590a9d4f23 ("EDAC/igen6: Add EDAC driver for Intel client SoCs using IBECC") Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219360 Signed-off-by: Orange Kao <orange(a)aiven.io> Signed-off-by: Tony Luck <tony.luck(a)intel.com> Link: https://lore.kernel.org/r/20241104124237.124109-2-orange@aiven.io Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Ye Bin <yebin10(a)huawei.com> --- drivers/edac/igen6_edac.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/edac/igen6_edac.c b/drivers/edac/igen6_edac.c index a0edb61a5a01..0b408299699a 100644 --- a/drivers/edac/igen6_edac.c +++ b/drivers/edac/igen6_edac.c @@ -1075,6 +1075,7 @@ static int igen6_register_mci(int mc, u64 mchbar, struct pci_dev *pdev) imc->mci = mci; return 0; fail3: + mci->pvt_info = NULL; kfree(mci->ctl_name); fail2: edac_mc_free(mci); @@ -1099,6 +1100,7 @@ static void igen6_unregister_mcis(void) edac_mc_del_mc(mci->pdev); kfree(mci->ctl_name); + mci->pvt_info = NULL; edac_mc_free(mci); iounmap(imc->window); } -- 2.34.1

2 5

[PATCH openEuler-1.0-LTS] sched/dynamic_affinity: Calculate cpu capacity in real time when realtime tasks are running on this cpu
by He Yujie 31 Dec '24

31 Dec '24

hulk inclusion category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEBAG -------------------------------- The task_rq selection of dynamic affinity use cpu capacity to determine select_cpus range. When realtime tasks are running on the cpu all the time, cfs tasks and the thread of softirq is suppressed, and the cpu capacity is not updated in time. As a result, the select_cpus range is always selected for preferred_cpus. then cfs task will never be able to run because realtime tasks has been running. Therefore, if realtime tasks is running during the task_rq selection of dynamic affinity, the cpu capacity should be calculated to solve such a problem. Fixes: 70a232a564cf ("sched: Adjust wakeup cpu range according CPU util dynamicly") Signed-off-by: He Yujie <coka.heyujie(a)huawei.com> --- kernel/sched/fair.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 63f4344ac344..4a357dce540c 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7226,6 +7226,19 @@ static inline bool prefer_cpus_valid(struct task_struct *p) cpumask_subset(prefer_cpus, &p->cpus_allowed); } +static unsigned long scale_rt_capacity(struct sched_domain *sd, int cpu); + +static inline unsigned long calc_cpu_capacity(int cpu) +{ + unsigned long capacity; + + capacity = scale_rt_capacity(NULL, cpu); + if (!capacity) + capacity = 1; + + return capacity; +} + /* * set_task_select_cpus: select the cpu range for task * @p: the task whose available cpu range will to set @@ -7288,7 +7301,11 @@ static void set_task_select_cpus(struct task_struct *p, int *idlest_cpu, } util_avg_sum += tg->se[cpu]->avg.util_avg; - tg_capacity += capacity_of(cpu); + + if (cpu_rq(cpu)->rt.rt_nr_running) + tg_capacity += calc_cpu_capacity(cpu); + else + tg_capacity += capacity_of(cpu); } rcu_read_unlock(); -- 2.34.1

2 1

[PATCH openEuler-1.0-LTS] [Backport] ALSA: 6fire: Release resources at card release
by Lin Ruifeng 31 Dec '24

31 Dec '24

From: Takashi Iwai <tiwai(a)suse.de> stable inclusion from stable-v4.19.325 commit 74357d0b5cd3ef544752bc9f21cbeee4902fae6c bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEAEC CVE: CVE-2024-53239 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit a0810c3d6dd2d29a9b92604d682eacd2902ce947 ] The current 6fire code tries to release the resources right after the call of usb6fire_chip_abort(). But at this moment, the card object might be still in use (as we're calling snd_card_free_when_closed()). For avoid potential UAFs, move the release of resources to the card's private_free instead of the manual call of usb6fire_chip_destroy() at the USB disconnect callback. Fixes: c6d43ba816d1 ("ALSA: usb/6fire - Driver for TerraTec DMX 6Fire USB") Signed-off-by: Takashi Iwai <tiwai(a)suse.de> Link: https://patch.msgid.link/20241113111042.15058-6-tiwai@suse.de Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Lin Ruifeng <linruifeng4(a)huawei.com> --- sound/usb/6fire/chip.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/sound/usb/6fire/chip.c b/sound/usb/6fire/chip.c index 17d5e3ee6d73..f5a9b7a0b585 100644 --- a/sound/usb/6fire/chip.c +++ b/sound/usb/6fire/chip.c @@ -66,8 +66,10 @@ static void usb6fire_chip_abort(struct sfire_chip *chip) } } -static void usb6fire_chip_destroy(struct sfire_chip *chip) +static void usb6fire_card_free(struct snd_card *card) { + struct sfire_chip *chip = card->private_data; + if (chip) { if (chip->pcm) usb6fire_pcm_destroy(chip); @@ -77,8 +79,6 @@ static void usb6fire_chip_destroy(struct sfire_chip *chip) usb6fire_comm_destroy(chip); if (chip->control) usb6fire_control_destroy(chip); - if (chip->card) - snd_card_free(chip->card); } } @@ -141,6 +141,7 @@ static int usb6fire_chip_probe(struct usb_interface *intf, chip->regidx = regidx; chip->intf_count = 1; chip->card = card; + card->private_free = usb6fire_card_free; ret = usb6fire_comm_init(chip); if (ret < 0) @@ -167,7 +168,7 @@ static int usb6fire_chip_probe(struct usb_interface *intf, return 0; destroy_chip: - usb6fire_chip_destroy(chip); + snd_card_free(card); return ret; } @@ -186,7 +187,6 @@ static void usb6fire_chip_disconnect(struct usb_interface *intf) chip->shutdown = true; usb6fire_chip_abort(chip); - usb6fire_chip_destroy(chip); } } } -- 2.22.0

2 1

[PATCH openEuler-22.03-LTS-SP1] bpf: fix OOB devmap writes when deleting elements
by Tengda Wu 31 Dec '24

31 Dec '24

From: Maciej Fijalkowski <maciej.fijalkowski(a)intel.com> stable inclusion from stable-v5.10.231 commit 70f3de869865f9c3da0508a5ea29f6f4c1889057 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEAPP CVE: CVE-2024-56615 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- commit ab244dd7cf4c291f82faacdc50b45cc0f55b674d upstream. Jordy reported issue against XSKMAP which also applies to DEVMAP - the index used for accessing map entry, due to being a signed integer, causes the OOB writes. Fix is simple as changing the type from int to u32, however, when compared to XSKMAP case, one more thing needs to be addressed. When map is released from system via dev_map_free(), we iterate through all of the entries and an iterator variable is also an int, which implies OOB accesses. Again, change it to be u32. Example splat below: [ 160.724676] BUG: unable to handle page fault for address: ffffc8fc2c001000 [ 160.731662] #PF: supervisor read access in kernel mode [ 160.736876] #PF: error_code(0x0000) - not-present page [ 160.742095] PGD 0 P4D 0 [ 160.744678] Oops: Oops: 0000 [#1] PREEMPT SMP [ 160.749106] CPU: 1 UID: 0 PID: 520 Comm: kworker/u145:12 Not tainted 6.12.0-rc1+ #487 [ 160.757050] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [ 160.767642] Workqueue: events_unbound bpf_map_free_deferred [ 160.773308] RIP: 0010:dev_map_free+0x77/0x170 [ 160.777735] Code: 00 e8 fd 91 ed ff e8 b8 73 ed ff 41 83 7d 18 19 74 6e 41 8b 45 24 49 8b bd f8 00 00 00 31 db 85 c0 74 48 48 63 c3 48 8d 04 c7 <48> 8b 28 48 85 ed 74 30 48 8b 7d 18 48 85 ff 74 05 e8 b3 52 fa ff [ 160.796777] RSP: 0018:ffffc9000ee1fe38 EFLAGS: 00010202 [ 160.802086] RAX: ffffc8fc2c001000 RBX: 0000000080000000 RCX: 0000000000000024 [ 160.809331] RDX: 0000000000000000 RSI: 0000000000000024 RDI: ffffc9002c001000 [ 160.816576] RBP: 0000000000000000 R08: 0000000000000023 R09: 0000000000000001 [ 160.823823] R10: 0000000000000001 R11: 00000000000ee6b2 R12: dead000000000122 [ 160.831066] R13: ffff88810c928e00 R14: ffff8881002df405 R15: 0000000000000000 [ 160.838310] FS: 0000000000000000(0000) GS:ffff8897e0c40000(0000) knlGS:0000000000000000 [ 160.846528] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 160.852357] CR2: ffffc8fc2c001000 CR3: 0000000005c32006 CR4: 00000000007726f0 [ 160.859604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 160.866847] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 160.874092] PKRU: 55555554 [ 160.876847] Call Trace: [ 160.879338] <TASK> [ 160.881477] ? __die+0x20/0x60 [ 160.884586] ? page_fault_oops+0x15a/0x450 [ 160.888746] ? search_extable+0x22/0x30 [ 160.892647] ? search_bpf_extables+0x5f/0x80 [ 160.896988] ? exc_page_fault+0xa9/0x140 [ 160.900973] ? asm_exc_page_fault+0x22/0x30 [ 160.905232] ? dev_map_free+0x77/0x170 [ 160.909043] ? dev_map_free+0x58/0x170 [ 160.912857] bpf_map_free_deferred+0x51/0x90 [ 160.917196] process_one_work+0x142/0x370 [ 160.921272] worker_thread+0x29e/0x3b0 [ 160.925082] ? rescuer_thread+0x4b0/0x4b0 [ 160.929157] kthread+0xd4/0x110 [ 160.932355] ? kthread_park+0x80/0x80 [ 160.936079] ret_from_fork+0x2d/0x50 [ 160.943396] ? kthread_park+0x80/0x80 [ 160.950803] ret_from_fork_asm+0x11/0x20 [ 160.958482] </TASK> Fixes: 546ac1ffb70d ("bpf: add devmap, a map for storing net device references") CC: stable(a)vger.kernel.org Reported-by: Jordy Zomer <jordyzomer(a)google.com> Suggested-by: Jordy Zomer <jordyzomer(a)google.com> Reviewed-by: Toke Høiland-Jørgensen <toke(a)redhat.com> Acked-by: John Fastabend <john.fastabend(a)gmail.com> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski(a)intel.com> Link: https://lore.kernel.org/r/20241122121030.716788-3-maciej.fijalkowski@intel.… Signed-off-by: Alexei Starovoitov <ast(a)kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Tengda Wu <wutengda2(a)huawei.com> --- kernel/bpf/devmap.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 7eb1282edc8e..e805811ac2c9 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -198,7 +198,7 @@ static struct bpf_map *dev_map_alloc(union bpf_attr *attr) static void dev_map_free(struct bpf_map *map) { struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map); - int i; + u32 i; /* At this point bpf_prog->aux->refcnt == 0 and this map->refcnt == 0, * so the programs (can be more than one that used this map) were @@ -557,7 +557,7 @@ static int dev_map_delete_elem(struct bpf_map *map, void *key) { struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map); struct bpf_dtab_netdev *old_dev; - int k = *(u32 *)key; + u32 k = *(u32 *)key; if (k >= map->max_entries) return -EINVAL; @@ -579,7 +579,7 @@ static int dev_map_hash_delete_elem(struct bpf_map *map, void *key) { struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map); struct bpf_dtab_netdev *old_dev; - int k = *(u32 *)key; + u32 k = *(u32 *)key; unsigned long flags; int ret = -ENOENT; -- 2.34.1

2 1

[PATCH OLK-5.10] bpf: fix OOB devmap writes when deleting elements
by Tengda Wu 31 Dec '24

31 Dec '24

From: Maciej Fijalkowski <maciej.fijalkowski(a)intel.com> stable inclusion from stable-v5.10.231 commit 70f3de869865f9c3da0508a5ea29f6f4c1889057 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEAPP CVE: CVE-2024-56615 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- commit ab244dd7cf4c291f82faacdc50b45cc0f55b674d upstream. Jordy reported issue against XSKMAP which also applies to DEVMAP - the index used for accessing map entry, due to being a signed integer, causes the OOB writes. Fix is simple as changing the type from int to u32, however, when compared to XSKMAP case, one more thing needs to be addressed. When map is released from system via dev_map_free(), we iterate through all of the entries and an iterator variable is also an int, which implies OOB accesses. Again, change it to be u32. Example splat below: [ 160.724676] BUG: unable to handle page fault for address: ffffc8fc2c001000 [ 160.731662] #PF: supervisor read access in kernel mode [ 160.736876] #PF: error_code(0x0000) - not-present page [ 160.742095] PGD 0 P4D 0 [ 160.744678] Oops: Oops: 0000 [#1] PREEMPT SMP [ 160.749106] CPU: 1 UID: 0 PID: 520 Comm: kworker/u145:12 Not tainted 6.12.0-rc1+ #487 [ 160.757050] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [ 160.767642] Workqueue: events_unbound bpf_map_free_deferred [ 160.773308] RIP: 0010:dev_map_free+0x77/0x170 [ 160.777735] Code: 00 e8 fd 91 ed ff e8 b8 73 ed ff 41 83 7d 18 19 74 6e 41 8b 45 24 49 8b bd f8 00 00 00 31 db 85 c0 74 48 48 63 c3 48 8d 04 c7 <48> 8b 28 48 85 ed 74 30 48 8b 7d 18 48 85 ff 74 05 e8 b3 52 fa ff [ 160.796777] RSP: 0018:ffffc9000ee1fe38 EFLAGS: 00010202 [ 160.802086] RAX: ffffc8fc2c001000 RBX: 0000000080000000 RCX: 0000000000000024 [ 160.809331] RDX: 0000000000000000 RSI: 0000000000000024 RDI: ffffc9002c001000 [ 160.816576] RBP: 0000000000000000 R08: 0000000000000023 R09: 0000000000000001 [ 160.823823] R10: 0000000000000001 R11: 00000000000ee6b2 R12: dead000000000122 [ 160.831066] R13: ffff88810c928e00 R14: ffff8881002df405 R15: 0000000000000000 [ 160.838310] FS: 0000000000000000(0000) GS:ffff8897e0c40000(0000) knlGS:0000000000000000 [ 160.846528] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 160.852357] CR2: ffffc8fc2c001000 CR3: 0000000005c32006 CR4: 00000000007726f0 [ 160.859604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 160.866847] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 160.874092] PKRU: 55555554 [ 160.876847] Call Trace: [ 160.879338] <TASK> [ 160.881477] ? __die+0x20/0x60 [ 160.884586] ? page_fault_oops+0x15a/0x450 [ 160.888746] ? search_extable+0x22/0x30 [ 160.892647] ? search_bpf_extables+0x5f/0x80 [ 160.896988] ? exc_page_fault+0xa9/0x140 [ 160.900973] ? asm_exc_page_fault+0x22/0x30 [ 160.905232] ? dev_map_free+0x77/0x170 [ 160.909043] ? dev_map_free+0x58/0x170 [ 160.912857] bpf_map_free_deferred+0x51/0x90 [ 160.917196] process_one_work+0x142/0x370 [ 160.921272] worker_thread+0x29e/0x3b0 [ 160.925082] ? rescuer_thread+0x4b0/0x4b0 [ 160.929157] kthread+0xd4/0x110 [ 160.932355] ? kthread_park+0x80/0x80 [ 160.936079] ret_from_fork+0x2d/0x50 [ 160.943396] ? kthread_park+0x80/0x80 [ 160.950803] ret_from_fork_asm+0x11/0x20 [ 160.958482] </TASK> Fixes: 546ac1ffb70d ("bpf: add devmap, a map for storing net device references") CC: stable(a)vger.kernel.org Reported-by: Jordy Zomer <jordyzomer(a)google.com> Suggested-by: Jordy Zomer <jordyzomer(a)google.com> Reviewed-by: Toke Høiland-Jørgensen <toke(a)redhat.com> Acked-by: John Fastabend <john.fastabend(a)gmail.com> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski(a)intel.com> Link: https://lore.kernel.org/r/20241122121030.716788-3-maciej.fijalkowski@intel.… Signed-off-by: Alexei Starovoitov <ast(a)kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Tengda Wu <wutengda2(a)huawei.com> --- kernel/bpf/devmap.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 7eb1282edc8e..e805811ac2c9 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -198,7 +198,7 @@ static struct bpf_map *dev_map_alloc(union bpf_attr *attr) static void dev_map_free(struct bpf_map *map) { struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map); - int i; + u32 i; /* At this point bpf_prog->aux->refcnt == 0 and this map->refcnt == 0, * so the programs (can be more than one that used this map) were @@ -557,7 +557,7 @@ static int dev_map_delete_elem(struct bpf_map *map, void *key) { struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map); struct bpf_dtab_netdev *old_dev; - int k = *(u32 *)key; + u32 k = *(u32 *)key; if (k >= map->max_entries) return -EINVAL; @@ -579,7 +579,7 @@ static int dev_map_hash_delete_elem(struct bpf_map *map, void *key) { struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map); struct bpf_dtab_netdev *old_dev; - int k = *(u32 *)key; + u32 k = *(u32 *)key; unsigned long flags; int ret = -ENOENT; -- 2.34.1

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