cve-2024-35932
Vulnerability from cvelistv5
Published
2024-05-19 10:10
Modified
2024-12-19 08:58
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: don't check if plane->state->fb == state->fb Currently, when using non-blocking commits, we can see the following kernel warning: [ 110.908514] ------------[ cut here ]------------ [ 110.908529] refcount_t: underflow; use-after-free. [ 110.908620] WARNING: CPU: 0 PID: 1866 at lib/refcount.c:87 refcount_dec_not_one+0xb8/0xc0 [ 110.908664] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep hid_logitech_hidpp vc4 brcmfmac hci_uart btbcm brcmutil bluetooth snd_soc_hdmi_codec cfg80211 cec drm_display_helper drm_dma_helper drm_kms_helper snd_soc_core snd_compress snd_pcm_dmaengine fb_sys_fops sysimgblt syscopyarea sysfillrect raspberrypi_hwmon ecdh_generic ecc rfkill libaes i2c_bcm2835 binfmt_misc joydev snd_bcm2835(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_dma_contig snd_pcm bcm2835_v4l2(C) raspberrypi_gpiomem bcm2835_mmal_vchiq(C) videobuf2_v4l2 snd_timer videobuf2_vmalloc videobuf2_memops videobuf2_common snd videodev vc_sm_cma(C) mc hid_logitech_dj uio_pdrv_genirq uio i2c_dev drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6 [ 110.909086] CPU: 0 PID: 1866 Comm: kodi.bin Tainted: G C 6.1.66-v8+ #32 [ 110.909104] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT) [ 110.909114] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 110.909132] pc : refcount_dec_not_one+0xb8/0xc0 [ 110.909152] lr : refcount_dec_not_one+0xb4/0xc0 [ 110.909170] sp : ffffffc00913b9c0 [ 110.909177] x29: ffffffc00913b9c0 x28: 000000556969bbb0 x27: 000000556990df60 [ 110.909205] x26: 0000000000000002 x25: 0000000000000004 x24: ffffff8004448480 [ 110.909230] x23: ffffff800570b500 x22: ffffff802e03a7bc x21: ffffffecfca68c78 [ 110.909257] x20: ffffff8002b42000 x19: ffffff802e03a600 x18: 0000000000000000 [ 110.909283] x17: 0000000000000011 x16: ffffffffffffffff x15: 0000000000000004 [ 110.909308] x14: 0000000000000fff x13: ffffffed577e47e0 x12: 0000000000000003 [ 110.909333] x11: 0000000000000000 x10: 0000000000000027 x9 : c912d0d083728c00 [ 110.909359] x8 : c912d0d083728c00 x7 : 65646e75203a745f x6 : 746e756f63666572 [ 110.909384] x5 : ffffffed579f62ee x4 : ffffffed579eb01e x3 : 0000000000000000 [ 110.909409] x2 : 0000000000000000 x1 : ffffffc00913b750 x0 : 0000000000000001 [ 110.909434] Call trace: [ 110.909441] refcount_dec_not_one+0xb8/0xc0 [ 110.909461] vc4_bo_dec_usecnt+0x4c/0x1b0 [vc4] [ 110.909903] vc4_cleanup_fb+0x44/0x50 [vc4] [ 110.910315] drm_atomic_helper_cleanup_planes+0x88/0xa4 [drm_kms_helper] [ 110.910669] vc4_atomic_commit_tail+0x390/0x9dc [vc4] [ 110.911079] commit_tail+0xb0/0x164 [drm_kms_helper] [ 110.911397] drm_atomic_helper_commit+0x1d0/0x1f0 [drm_kms_helper] [ 110.911716] drm_atomic_commit+0xb0/0xdc [drm] [ 110.912569] drm_mode_atomic_ioctl+0x348/0x4b8 [drm] [ 110.913330] drm_ioctl_kernel+0xec/0x15c [drm] [ 110.914091] drm_ioctl+0x24c/0x3b0 [drm] [ 110.914850] __arm64_sys_ioctl+0x9c/0xd4 [ 110.914873] invoke_syscall+0x4c/0x114 [ 110.914897] el0_svc_common+0xd0/0x118 [ 110.914917] do_el0_svc+0x38/0xd0 [ 110.914936] el0_svc+0x30/0x8c [ 110.914958] el0t_64_sync_handler+0x84/0xf0 [ 110.914979] el0t_64_sync+0x18c/0x190 [ 110.914996] ---[ end trace 0000000000000000 ]--- This happens because, although `prepare_fb` and `cleanup_fb` are perfectly balanced, we cannot guarantee consistency in the check plane->state->fb == state->fb. This means that sometimes we can increase the refcount in `prepare_fb` and don't decrease it in `cleanup_fb`. The opposite can also be true. In fact, the struct drm_plane .state shouldn't be accessed directly but instead, the `drm_atomic_get_new_plane_state()` helper function should be used. So, we could stick to this check, but using `drm_atomic_get_new_plane_state()`. But actually, this check is not re ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
   containers: {
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                  other: {
                     content: {
                        id: "CVE-2024-35932",
                        options: [
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                              Exploitation: "none",
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                           {
                              Automatable: "no",
                           },
                           {
                              "Technical Impact": "partial",
                           },
                        ],
                        role: "CISA Coordinator",
                        timestamp: "2024-06-17T17:38:26.855561Z",
                        version: "2.0.3",
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                     type: "ssvc",
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               dateUpdated: "2024-06-17T17:40:48.456Z",
               orgId: "134c704f-9b21-4f2e-91b3-4a467353bcc0",
               shortName: "CISA-ADP",
            },
            title: "CISA ADP Vulnrichment",
         },
         {
            providerMetadata: {
               dateUpdated: "2024-08-02T03:21:48.974Z",
               orgId: "af854a3a-2127-422b-91ae-364da2661108",
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            title: "CVE Program Container",
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      cna: {
         affected: [
            {
               defaultStatus: "unaffected",
               product: "Linux",
               programFiles: [
                  "drivers/gpu/drm/vc4/vc4_plane.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     lessThan: "48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40",
                     status: "affected",
                     version: "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                     versionType: "git",
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                     lessThan: "d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c",
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                     versionType: "git",
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                  {
                     lessThan: "5343f724c912c77541029123f47ecd3d2ea63bdd",
                     status: "affected",
                     version: "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                     versionType: "git",
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                  {
                     lessThan: "5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9",
                     status: "affected",
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                     versionType: "git",
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            {
               defaultStatus: "affected",
               product: "Linux",
               programFiles: [
                  "drivers/gpu/drm/vc4/vc4_plane.c",
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               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     lessThanOrEqual: "6.1.*",
                     status: "unaffected",
                     version: "6.1.86",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.6.*",
                     status: "unaffected",
                     version: "6.6.27",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.8.*",
                     status: "unaffected",
                     version: "6.8.6",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "*",
                     status: "unaffected",
                     version: "6.9",
                     versionType: "original_commit_for_fix",
                  },
               ],
            },
         ],
         descriptions: [
            {
               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: don't check if plane->state->fb == state->fb\n\nCurrently, when using non-blocking commits, we can see the following\nkernel warning:\n\n[  110.908514] ------------[ cut here ]------------\n[  110.908529] refcount_t: underflow; use-after-free.\n[  110.908620] WARNING: CPU: 0 PID: 1866 at lib/refcount.c:87 refcount_dec_not_one+0xb8/0xc0\n[  110.908664] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep hid_logitech_hidpp vc4 brcmfmac hci_uart btbcm brcmutil bluetooth snd_soc_hdmi_codec cfg80211 cec drm_display_helper drm_dma_helper drm_kms_helper snd_soc_core snd_compress snd_pcm_dmaengine fb_sys_fops sysimgblt syscopyarea sysfillrect raspberrypi_hwmon ecdh_generic ecc rfkill libaes i2c_bcm2835 binfmt_misc joydev snd_bcm2835(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_dma_contig snd_pcm bcm2835_v4l2(C) raspberrypi_gpiomem bcm2835_mmal_vchiq(C) videobuf2_v4l2 snd_timer videobuf2_vmalloc videobuf2_memops videobuf2_common snd videodev vc_sm_cma(C) mc hid_logitech_dj uio_pdrv_genirq uio i2c_dev drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6\n[  110.909086] CPU: 0 PID: 1866 Comm: kodi.bin Tainted: G         C         6.1.66-v8+ #32\n[  110.909104] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT)\n[  110.909114] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[  110.909132] pc : refcount_dec_not_one+0xb8/0xc0\n[  110.909152] lr : refcount_dec_not_one+0xb4/0xc0\n[  110.909170] sp : ffffffc00913b9c0\n[  110.909177] x29: ffffffc00913b9c0 x28: 000000556969bbb0 x27: 000000556990df60\n[  110.909205] x26: 0000000000000002 x25: 0000000000000004 x24: ffffff8004448480\n[  110.909230] x23: ffffff800570b500 x22: ffffff802e03a7bc x21: ffffffecfca68c78\n[  110.909257] x20: ffffff8002b42000 x19: ffffff802e03a600 x18: 0000000000000000\n[  110.909283] x17: 0000000000000011 x16: ffffffffffffffff x15: 0000000000000004\n[  110.909308] x14: 0000000000000fff x13: ffffffed577e47e0 x12: 0000000000000003\n[  110.909333] x11: 0000000000000000 x10: 0000000000000027 x9 : c912d0d083728c00\n[  110.909359] x8 : c912d0d083728c00 x7 : 65646e75203a745f x6 : 746e756f63666572\n[  110.909384] x5 : ffffffed579f62ee x4 : ffffffed579eb01e x3 : 0000000000000000\n[  110.909409] x2 : 0000000000000000 x1 : ffffffc00913b750 x0 : 0000000000000001\n[  110.909434] Call trace:\n[  110.909441]  refcount_dec_not_one+0xb8/0xc0\n[  110.909461]  vc4_bo_dec_usecnt+0x4c/0x1b0 [vc4]\n[  110.909903]  vc4_cleanup_fb+0x44/0x50 [vc4]\n[  110.910315]  drm_atomic_helper_cleanup_planes+0x88/0xa4 [drm_kms_helper]\n[  110.910669]  vc4_atomic_commit_tail+0x390/0x9dc [vc4]\n[  110.911079]  commit_tail+0xb0/0x164 [drm_kms_helper]\n[  110.911397]  drm_atomic_helper_commit+0x1d0/0x1f0 [drm_kms_helper]\n[  110.911716]  drm_atomic_commit+0xb0/0xdc [drm]\n[  110.912569]  drm_mode_atomic_ioctl+0x348/0x4b8 [drm]\n[  110.913330]  drm_ioctl_kernel+0xec/0x15c [drm]\n[  110.914091]  drm_ioctl+0x24c/0x3b0 [drm]\n[  110.914850]  __arm64_sys_ioctl+0x9c/0xd4\n[  110.914873]  invoke_syscall+0x4c/0x114\n[  110.914897]  el0_svc_common+0xd0/0x118\n[  110.914917]  do_el0_svc+0x38/0xd0\n[  110.914936]  el0_svc+0x30/0x8c\n[  110.914958]  el0t_64_sync_handler+0x84/0xf0\n[  110.914979]  el0t_64_sync+0x18c/0x190\n[  110.914996] ---[ end trace 0000000000000000 ]---\n\nThis happens because, although `prepare_fb` and `cleanup_fb` are\nperfectly balanced, we cannot guarantee consistency in the check\nplane->state->fb == state->fb. This means that sometimes we can increase\nthe refcount in `prepare_fb` and don't decrease it in `cleanup_fb`. The\nopposite can also be true.\n\nIn fact, the struct drm_plane .state shouldn't be accessed directly\nbut instead, the `drm_atomic_get_new_plane_state()` helper function should\nbe used. So, we could stick to this check, but using\n`drm_atomic_get_new_plane_state()`. But actually, this check is not re\n---truncated---",
            },
         ],
         providerMetadata: {
            dateUpdated: "2024-12-19T08:58:32.123Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               url: "https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40",
            },
            {
               url: "https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c",
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            {
               url: "https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd",
            },
            {
               url: "https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9",
            },
         ],
         title: "drm/vc4: don't check if plane->state->fb == state->fb",
         x_generator: {
            engine: "bippy-5f407fcff5a0",
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2024-35932",
      datePublished: "2024-05-19T10:10:40.353Z",
      dateReserved: "2024-05-17T13:50:33.130Z",
      dateUpdated: "2024-12-19T08:58:32.123Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2024-35932\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-19T11:15:49.203\",\"lastModified\":\"2024-11-21T09:21:13.957\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/vc4: don't check if plane->state->fb == state->fb\\n\\nCurrently, when using non-blocking commits, we can see the following\\nkernel warning:\\n\\n[  110.908514] ------------[ cut here ]------------\\n[  110.908529] refcount_t: underflow; use-after-free.\\n[  110.908620] WARNING: CPU: 0 PID: 1866 at lib/refcount.c:87 refcount_dec_not_one+0xb8/0xc0\\n[  110.908664] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep hid_logitech_hidpp vc4 brcmfmac hci_uart btbcm brcmutil bluetooth snd_soc_hdmi_codec cfg80211 cec drm_display_helper drm_dma_helper drm_kms_helper snd_soc_core snd_compress snd_pcm_dmaengine fb_sys_fops sysimgblt syscopyarea sysfillrect raspberrypi_hwmon ecdh_generic ecc rfkill libaes i2c_bcm2835 binfmt_misc joydev snd_bcm2835(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_dma_contig snd_pcm bcm2835_v4l2(C) raspberrypi_gpiomem bcm2835_mmal_vchiq(C) videobuf2_v4l2 snd_timer videobuf2_vmalloc videobuf2_memops videobuf2_common snd videodev vc_sm_cma(C) mc hid_logitech_dj uio_pdrv_genirq uio i2c_dev drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6\\n[  110.909086] CPU: 0 PID: 1866 Comm: kodi.bin Tainted: G         C         6.1.66-v8+ #32\\n[  110.909104] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT)\\n[  110.909114] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\\n[  110.909132] pc : refcount_dec_not_one+0xb8/0xc0\\n[  110.909152] lr : refcount_dec_not_one+0xb4/0xc0\\n[  110.909170] sp : ffffffc00913b9c0\\n[  110.909177] x29: ffffffc00913b9c0 x28: 000000556969bbb0 x27: 000000556990df60\\n[  110.909205] x26: 0000000000000002 x25: 0000000000000004 x24: ffffff8004448480\\n[  110.909230] x23: ffffff800570b500 x22: ffffff802e03a7bc x21: ffffffecfca68c78\\n[  110.909257] x20: ffffff8002b42000 x19: ffffff802e03a600 x18: 0000000000000000\\n[  110.909283] x17: 0000000000000011 x16: ffffffffffffffff x15: 0000000000000004\\n[  110.909308] x14: 0000000000000fff x13: ffffffed577e47e0 x12: 0000000000000003\\n[  110.909333] x11: 0000000000000000 x10: 0000000000000027 x9 : c912d0d083728c00\\n[  110.909359] x8 : c912d0d083728c00 x7 : 65646e75203a745f x6 : 746e756f63666572\\n[  110.909384] x5 : ffffffed579f62ee x4 : ffffffed579eb01e x3 : 0000000000000000\\n[  110.909409] x2 : 0000000000000000 x1 : ffffffc00913b750 x0 : 0000000000000001\\n[  110.909434] Call trace:\\n[  110.909441]  refcount_dec_not_one+0xb8/0xc0\\n[  110.909461]  vc4_bo_dec_usecnt+0x4c/0x1b0 [vc4]\\n[  110.909903]  vc4_cleanup_fb+0x44/0x50 [vc4]\\n[  110.910315]  drm_atomic_helper_cleanup_planes+0x88/0xa4 [drm_kms_helper]\\n[  110.910669]  vc4_atomic_commit_tail+0x390/0x9dc [vc4]\\n[  110.911079]  commit_tail+0xb0/0x164 [drm_kms_helper]\\n[  110.911397]  drm_atomic_helper_commit+0x1d0/0x1f0 [drm_kms_helper]\\n[  110.911716]  drm_atomic_commit+0xb0/0xdc [drm]\\n[  110.912569]  drm_mode_atomic_ioctl+0x348/0x4b8 [drm]\\n[  110.913330]  drm_ioctl_kernel+0xec/0x15c [drm]\\n[  110.914091]  drm_ioctl+0x24c/0x3b0 [drm]\\n[  110.914850]  __arm64_sys_ioctl+0x9c/0xd4\\n[  110.914873]  invoke_syscall+0x4c/0x114\\n[  110.914897]  el0_svc_common+0xd0/0x118\\n[  110.914917]  do_el0_svc+0x38/0xd0\\n[  110.914936]  el0_svc+0x30/0x8c\\n[  110.914958]  el0t_64_sync_handler+0x84/0xf0\\n[  110.914979]  el0t_64_sync+0x18c/0x190\\n[  110.914996] ---[ end trace 0000000000000000 ]---\\n\\nThis happens because, although `prepare_fb` and `cleanup_fb` are\\nperfectly balanced, we cannot guarantee consistency in the check\\nplane->state->fb == state->fb. This means that sometimes we can increase\\nthe refcount in `prepare_fb` and don't decrease it in `cleanup_fb`. The\\nopposite can also be true.\\n\\nIn fact, the struct drm_plane .state shouldn't be accessed directly\\nbut instead, the `drm_atomic_get_new_plane_state()` helper function should\\nbe used. So, we could stick to this check, but using\\n`drm_atomic_get_new_plane_state()`. But actually, this check is not re\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/vc4: no comprobar si plano->estado->fb == estado->fb Actualmente, al usar confirmaciones sin bloqueo, podemos ver la siguiente advertencia del kernel : [110.908514] ------------[ cortar aquí ]------------ [ 110.908529] refcount_t: subdesbordamiento; uso después de la liberación. [110.908620] ADVERTENCIA: CPU: 0 PID: 1866 en lib/refcount.c:87 refcount_dec_not_one+0xb8/0xc0 [110.908664] Módulos vinculados en: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device cmac algif_hash aes _arm64 aes_generic algif_skcipher af_alg bnep hid_logitech_hidpp vc4 brcmfmac hci_uart btbcm brcmutil bluetooth snd_soc_hdmi_codec cfg80211 cec drm_display_helper drm_dma_helper drm_kms_helper snd_soc_core snd_compress snd_pcm_dmaengine fb_sys_fops sysimgblt syscopyarea sysfillrect raspberrypi_hwmon ecdh_generic ecc rfkill libaes i2c_bcm 2835 binfmt_misc joydev snd_bcm2835(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_dma_contig snd_pcm bcm2835_v4l2(C) raspberrypi_gpiomem bcm2835_mmal_vchiq(C) 2 snd_timer videobuf2_vmalloc videobuf2_memops videobuf2_common snd videodev vc_sm_cma(C) mc hid_logitech_dj uio_pdrv_genirq uio i2c_dev drm fuse dm_mod drm_panel_orientation_quirks retroiluminación ip_tables x_tables ipv6 [110.909086] CPU: 0 PID: 1866 Comm: kodi.bin Contaminado: GC 6.1.66 -v8+ #32 [110.909104] Nombre del hardware: Frambuesa Pi 3 Modelo B Rev 1.2 (DT) [ 110.909114] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 110.909132] pc : refcount_dec_not_one+0xb8/0xc0 [ 110.909152] lr : refcount_dec_not_one + 0xb4/0xc0 [ 110.909170] sp : ffffffc00913b9c0 [ 110.909177] x29: ffffffc00913b9c0 x28: 000000556969bbb0 x27: 000000556990df60 [ 110.909205 ] x26: 0000000000000002 x25: 00000000000000004 x24: ffffff8004448480 [ 110.909230] x23: ffffff800570b500 x22: ffffff802e03a7bc x21: [110.909257] x20: ffffff8002b42000 x19: ffffff802e03a600 x18: 0000000000000000 [ 110.909283] x17: 00000000000000011 x16: ffffffffffffffff x15: 0000000000000004 [ 110.909308] x14: 0000000000000fff x13: ffffffed577e47e0 x12: 0000000000000003 [ 110.909333] x11: 0000000000000000 x10: 00000000000000027 x9: c912d0d083728c00 [110.909359] x8: c912d0d083728c00 x7 : 65646e75203a745f x6 : 746e756f63666572 [ 110.909384] x5 : ffffffed579f62ee x4 : ffffffed579eb01e x3 : 00000000000000000 [ 110.909409] x2 : 00000000000 x1: ffffffc00913b750 x0: 0000000000000001 [110.909434] Rastreo de llamadas: [110.909441] refcount_dec_not_one+0xb8/0xc0 [110.909461] / 0x1b0 [vc4] [ 110.909903] vc4_cleanup_fb+0x44/0x50 [vc4] [ 110.910315] drm_atomic_helper_cleanup_planes+0x88/0xa4 [drm_kms_helper] [ 110.910669] 0/0x9dc [vc4] [110.911079] commit_tail+0xb0/0x164 [drm_kms_helper] [110.911397 ] drm_atomic_helper_commit+0x1d0/0x1f0 [drm_kms_helper] [ 110.911716] drm_atomic_commit+0xb0/0xdc [drm] [ 110.912569] drm_mode_atomic_ioctl+0x348/0x4b8 [drm] [ 110.913330 ] drm_ioctl_kernel+0xec/0x15c [drm] [ 110.914091] drm_ioctl+0x24c/0x3b0 [drm] [ 110.914850] __arm64_sys_ioctl+0x9c/0xd4 [ 110.914873] invoke_syscall+0x4c/0x114 [ 110.914897] el0_svc_common+0xd0/0x118 [ 110.914917] svc+0x38/0xd0 [ 110.914936] el0_svc+0x30/0x8c [ 110.914958] el0t_64_sync_handler+0x84/ 0xf0 [ 110.914979] el0t_64_sync+0x18c/0x190 [ 110.914996] ---[ end trace 0000000000000000 ]--- Esto sucede porque, aunque `prepare_fb` y `cleanup_fb` están perfectamente equilibrados, no podemos garantizar la coherencia en el plano de verificación->estado ->fb == estado->fb. Esto significa que a veces podemos aumentar el recuento en `prepare_fb` y no disminuirlo en `cleanup_fb`. Lo contrario también puede ser cierto. De hecho, no se debe acceder directamente a la estructura drm_plane .state, sino que se debe utilizar la función auxiliar `drm_atomic_get_new_plane_state()`. Entonces, podríamos ceñirnos a esta verificación, pero usando `drm_atomic_get_new_plane_state()`. Pero en realidad, esta verificación no se re---trunca---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T03:21:48.974Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-35932\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-17T17:38:26.855561Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-17T17:38:27.816Z\"}}], \"cna\": {\"title\": \"drm/vc4: don't check if plane->state->fb == state->fb\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"5343f724c912c77541029123f47ecd3d2ea63bdd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/gpu/drm/vc4/vc4_plane.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"6.1.86\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.27\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/gpu/drm/vc4/vc4_plane.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/48bfb4b03c5ff6e1fa1dc73fb915e150b0968c40\"}, {\"url\": \"https://git.kernel.org/stable/c/d6b2fe2db1d0927b2d7df5c763eba55d0e1def3c\"}, {\"url\": \"https://git.kernel.org/stable/c/5343f724c912c77541029123f47ecd3d2ea63bdd\"}, {\"url\": \"https://git.kernel.org/stable/c/5ee0d47dcf33efd8950b347dcf4d20bab12a3fa9\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/vc4: don't check if plane->state->fb == state->fb\\n\\nCurrently, when using non-blocking commits, we can see the following\\nkernel warning:\\n\\n[  110.908514] ------------[ cut here ]------------\\n[  110.908529] refcount_t: underflow; use-after-free.\\n[  110.908620] WARNING: CPU: 0 PID: 1866 at lib/refcount.c:87 refcount_dec_not_one+0xb8/0xc0\\n[  110.908664] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep hid_logitech_hidpp vc4 brcmfmac hci_uart btbcm brcmutil bluetooth snd_soc_hdmi_codec cfg80211 cec drm_display_helper drm_dma_helper drm_kms_helper snd_soc_core snd_compress snd_pcm_dmaengine fb_sys_fops sysimgblt syscopyarea sysfillrect raspberrypi_hwmon ecdh_generic ecc rfkill libaes i2c_bcm2835 binfmt_misc joydev snd_bcm2835(C) bcm2835_codec(C) bcm2835_isp(C) v4l2_mem2mem videobuf2_dma_contig snd_pcm bcm2835_v4l2(C) raspberrypi_gpiomem bcm2835_mmal_vchiq(C) videobuf2_v4l2 snd_timer videobuf2_vmalloc videobuf2_memops videobuf2_common snd videodev vc_sm_cma(C) mc hid_logitech_dj uio_pdrv_genirq uio i2c_dev drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6\\n[  110.909086] CPU: 0 PID: 1866 Comm: kodi.bin Tainted: G         C         6.1.66-v8+ #32\\n[  110.909104] Hardware name: Raspberry Pi 3 Model B Rev 1.2 (DT)\\n[  110.909114] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\\n[  110.909132] pc : refcount_dec_not_one+0xb8/0xc0\\n[  110.909152] lr : refcount_dec_not_one+0xb4/0xc0\\n[  110.909170] sp : ffffffc00913b9c0\\n[  110.909177] x29: ffffffc00913b9c0 x28: 000000556969bbb0 x27: 000000556990df60\\n[  110.909205] x26: 0000000000000002 x25: 0000000000000004 x24: ffffff8004448480\\n[  110.909230] x23: ffffff800570b500 x22: ffffff802e03a7bc x21: ffffffecfca68c78\\n[  110.909257] x20: ffffff8002b42000 x19: ffffff802e03a600 x18: 0000000000000000\\n[  110.909283] x17: 0000000000000011 x16: ffffffffffffffff x15: 0000000000000004\\n[  110.909308] x14: 0000000000000fff x13: ffffffed577e47e0 x12: 0000000000000003\\n[  110.909333] x11: 0000000000000000 x10: 0000000000000027 x9 : c912d0d083728c00\\n[  110.909359] x8 : c912d0d083728c00 x7 : 65646e75203a745f x6 : 746e756f63666572\\n[  110.909384] x5 : ffffffed579f62ee x4 : ffffffed579eb01e x3 : 0000000000000000\\n[  110.909409] x2 : 0000000000000000 x1 : ffffffc00913b750 x0 : 0000000000000001\\n[  110.909434] Call trace:\\n[  110.909441]  refcount_dec_not_one+0xb8/0xc0\\n[  110.909461]  vc4_bo_dec_usecnt+0x4c/0x1b0 [vc4]\\n[  110.909903]  vc4_cleanup_fb+0x44/0x50 [vc4]\\n[  110.910315]  drm_atomic_helper_cleanup_planes+0x88/0xa4 [drm_kms_helper]\\n[  110.910669]  vc4_atomic_commit_tail+0x390/0x9dc [vc4]\\n[  110.911079]  commit_tail+0xb0/0x164 [drm_kms_helper]\\n[  110.911397]  drm_atomic_helper_commit+0x1d0/0x1f0 [drm_kms_helper]\\n[  110.911716]  drm_atomic_commit+0xb0/0xdc [drm]\\n[  110.912569]  drm_mode_atomic_ioctl+0x348/0x4b8 [drm]\\n[  110.913330]  drm_ioctl_kernel+0xec/0x15c [drm]\\n[  110.914091]  drm_ioctl+0x24c/0x3b0 [drm]\\n[  110.914850]  __arm64_sys_ioctl+0x9c/0xd4\\n[  110.914873]  invoke_syscall+0x4c/0x114\\n[  110.914897]  el0_svc_common+0xd0/0x118\\n[  110.914917]  do_el0_svc+0x38/0xd0\\n[  110.914936]  el0_svc+0x30/0x8c\\n[  110.914958]  el0t_64_sync_handler+0x84/0xf0\\n[  110.914979]  el0t_64_sync+0x18c/0x190\\n[  110.914996] ---[ end trace 0000000000000000 ]---\\n\\nThis happens because, although `prepare_fb` and `cleanup_fb` are\\nperfectly balanced, we cannot guarantee consistency in the check\\nplane->state->fb == state->fb. This means that sometimes we can increase\\nthe refcount in `prepare_fb` and don't decrease it in `cleanup_fb`. The\\nopposite can also be true.\\n\\nIn fact, the struct drm_plane .state shouldn't be accessed directly\\nbut instead, the `drm_atomic_get_new_plane_state()` helper function should\\nbe used. So, we could stick to this check, but using\\n`drm_atomic_get_new_plane_state()`. But actually, this check is not re\\n---truncated---\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:58:32.123Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-35932\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:58:32.123Z\", \"dateReserved\": \"2024-05-17T13:50:33.130Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-19T10:10:40.353Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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