CVE-2021-47497

一、漏洞信息
 漏洞编号：[CVE-2021-47497](https://nvd.nist.gov/vuln/detail/CVE-2021-47497)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.0,6.1.14,6.1.19,6.1.5,6.1.6,6.1.8,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：0.0 None
  Vector：CVSS：3.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:nvmem: Fix shift-out-of-bound (UBSAN) with byte size cellsIf a cell has  nbits  equal to a multiple of BITS_PER_BYTE the logic *p &= GENMASK((cell->nbits%BITS_PER_BYTE) - 1, 0);will become undefined behavior because nbits modulo BITS_PER_BYTE is 0, and wesubtract one from that making a large number that is then shifted more than thenumber of bits that fit into an unsigned long.UBSAN reports this problem: UBSAN: shift-out-of-bounds in drivers/nvmem/core.c:1386:8 shift exponent 64 is too large for 64-bit type  unsigned long  CPU: 6 PID: 7 Comm: kworker/u16:0 Not tainted 5.15.0-rc3+ #9 Hardware name: Google Lazor (rev3+) with KB Backlight (DT) Workqueue: events_unbound deferred_probe_work_func Call trace:  dump_backtrace+0x0/0x170  show_stack+0x24/0x30  dump_stack_lvl+0x64/0x7c  dump_stack+0x18/0x38  ubsan_epilogue+0x10/0x54  __ubsan_handle_shift_out_of_bounds+0x180/0x194  __nvmem_cell_read+0x1ec/0x21c  nvmem_cell_read+0x58/0x94  nvmem_cell_read_variable_common+0x4c/0xb0  nvmem_cell_read_variable_le_u32+0x40/0x100  a6xx_gpu_init+0x170/0x2f4  adreno_bind+0x174/0x284  component_bind_all+0xf0/0x264  msm_drm_bind+0x1d8/0x7a0  try_to_bring_up_master+0x164/0x1ac  __component_add+0xbc/0x13c  component_add+0x20/0x2c  dp_display_probe+0x340/0x384  platform_probe+0xc0/0x100  really_probe+0x110/0x304  __driver_probe_device+0xb8/0x120  driver_probe_device+0x4c/0xfc  __device_attach_driver+0xb0/0x128  bus_for_each_drv+0x90/0xdc  __device_attach+0xc8/0x174  device_initial_probe+0x20/0x2c  bus_probe_device+0x40/0xa4  deferred_probe_work_func+0x7c/0xb8  process_one_work+0x128/0x21c  process_scheduled_works+0x40/0x54  worker_thread+0x1ec/0x2a8  kthread+0x138/0x158  ret_from_fork+0x10/0x20Fix it by making sure there are any bits to mask out.
 漏洞公开时间：2024-05-22 17:15:11
 漏洞创建时间：2024-05-22 09:27:05
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2021-47497
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/0594f1d048d8dc338eb9a240021b1d00ae1eb082 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/0e822e5413da1af28cca350cb1cb42b6133bdcae |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/2df6c023050205c4d04ffc121bc549f65cb8d1df |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/57e48886401b14cd351423fabfec2cfd18df4f66 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/5d388fa01fa6eb310ac023a363a6cb216d9d8fe9 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/60df06bbdf497e37ed25ad40572c362e5b0998df |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/abcb8d33e4d2215ccde5ab5ccf9f730a59d79d97 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/eb0fc8e7170e61eaf65d28dee4a8baf4e86b19ca |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47497 | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2021-47497 | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://git.kernel.org/stable/c/0594f1d048d8dc338eb9a240021b1d00ae1eb082 | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://git.kernel.org/stable/c/0e822e5413da1af28cca350cb1cb42b6133bdcae | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://git.kernel.org/stable/c/2df6c023050205c4d04ffc121bc549f65cb8d1df | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://git.kernel.org/stable/c/57e48886401b14cd351423fabfec2cfd18df4f66 | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://git.kernel.org/stable/c/5d388fa01fa6eb310ac023a363a6cb216d9d8fe9 | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://git.kernel.org/stable/c/60df06bbdf497e37ed25ad40572c362e5b0998df | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://git.kernel.org/stable/c/abcb8d33e4d2215ccde5ab5ccf9f730a59d79d97 | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://git.kernel.org/stable/c/eb0fc8e7170e61eaf65d28dee4a8baf4e86b19ca | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47497.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2282918 | https://bugzilla.suse.com/show_bug.cgi?id=1225355 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024052242-CVE-2021-47497-449e@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2282918 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2021-47497 | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://git.kernel.org/linus/5d388fa01fa6eb310ac023a363a6cb216d9d8fe9 (5.15-rc6) | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://git.kernel.org/stable/c/abcb8d33e4d2215ccde5ab5ccf9f730a59d79d97 | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://git.kernel.org/stable/c/60df06bbdf497e37ed25ad40572c362e5b0998df | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://git.kernel.org/stable/c/2df6c023050205c4d04ffc121bc549f65cb8d1df | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://git.kernel.org/stable/c/eb0fc8e7170e61eaf65d28dee4a8baf4e86b19ca | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://git.kernel.org/stable/c/0594f1d048d8dc338eb9a240021b1d00ae1eb082 | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://git.kernel.org/stable/c/57e48886401b14cd351423fabfec2cfd18df4f66 | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://git.kernel.org/stable/c/0e822e5413da1af28cca350cb1cb42b6133bdcae | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://git.kernel.org/stable/c/5d388fa01fa6eb310ac023a363a6cb216d9d8fe9 | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2021-47497 | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2021-47497 | https://ubuntu.com/security/CVE-2021-47497 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2021-47497 | https://ubuntu.com/security/CVE-2021-47497 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2021-47497 |

</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  其它
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
| linux |  | https://git.kernel.org/linus/5d388fa01fa6eb310ac023a363a6cb216d9d8fe9 | https://git.kernel.org/linus/69aba7948cbe53f2f1827e84e9dd0ae470a5072e | ubuntu |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
  In the Linux kernel, the following vulnerability has been resolved:nvmem: Fix shift-out-of-bound (UBSAN) with byte size cellsIf a cell has  nbits  equal to a multiple of BITS_PER_BYTE the logic *p &= GENMASK((cell->nbits%BITS_PER_BYTE) - 1, 0);will become undefined behavior because nbits modulo BITS_PER_BYTE is 0, and wesubtract one from that making a large number that is then shifted more than thenumber of bits that fit into an unsigned long.UBSAN reports this problem: UBSAN: shift-out-of-bounds in drivers/nvmem/core.c:1386:8 shift exponent 64 is too large for 64-bit type  unsigned long  CPU: 6 PID: 7 Comm: kworker/u16:0 Not tainted 5.15.0-rc3+ #9 Hardware name: Google Lazor (rev3+) with KB Backlight (DT) Workqueue: events_unbound deferred_probe_work_func Call trace:  dump_backtrace+0x0/0x170  show_stack+0x24/0x30  dump_stack_lvl+0x64/0x7c  dump_stack+0x18/0x38  ubsan_epilogue+0x10/0x54  __ubsan_handle_shift_out_of_bounds+0x180/0x194  __nvmem_cell_read+0x1ec/0x21c  nvmem_cell_read+0x58/0x94  nvmem_cell_read_variable_common+0x4c/0xb0  nvmem_cell_read_variable_le_u32+0x40/0x100  a6xx_gpu_init+0x170/0x2f4  adreno_bind+0x174/0x284  component_bind_all+0xf0/0x264  msm_drm_bind+0x1d8/0x7a0  try_to_bring_up_master+0x164/0x1ac  __component_add+0xbc/0x13c  component_add+0x20/0x2c  dp_display_probe+0x340/0x384  platform_probe+0xc0/0x100  really_probe+0x110/0x304  __driver_probe_device+0xb8/0x120  driver_probe_device+0x4c/0xfc  __device_attach_driver+0xb0/0x128  bus_for_each_drv+0x90/0xdc  __device_attach+0xc8/0x174  device_initial_probe+0x20/0x2c  bus_probe_device+0x40/0xa4  deferred_probe_work_func+0x7c/0xb8  process_one_work+0x128/0x21c  process_scheduled_works+0x40/0x54  worker_thread+0x1ec/0x2a8  kthread+0x138/0x158  ret_from_fork+0x10/0x20Fix it by making sure there are any bits to mask out.
 openEuler评分：
  4.4
 Vector：CVSS：3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-20.03-LTS-SP4(4.19.90):受影响
2.openEuler-22.03-LTS-SP1(5.10.0):不受影响
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响
4.openEuler-22.03-LTS-SP4(5.10.0):不受影响
5.master(6.6.0):不受影响
6.openEuler-24.03-LTS(6.6.0):不受影响
7.openEuler-24.03-LTS-Next(6.6.0):不受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP4(4.19.90):否
2.openEuler-22.03-LTS-SP1(5.10.0):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.master(6.6.0):否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.openEuler-22.03-LTS-SP4(5.10.0):否

原因说明：
  1.master(6.6.0):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP1(5.10.0):
4.openEuler-22.03-LTS-SP3(5.10.0):
5.openEuler-22.03-LTS-SP4(5.10.0):
6.openEuler-24.03-LTS(6.6.0):
7.openEuler-24.03-LTS-Next(6.6.0):

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