CVE-2021-47346

coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()

State: Published
Severity: 7.1 High
Published: May 21, 2024
Updated: Aug 5, 2026
Reserved: May 21, 2024

Description

In the Linux kernel, the following vulnerability has been resolved:

coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()

commit 6f755e85c332 ("coresight: Add helper for inserting synchronization packets") removed trailing '\0' from barrier_pkt array and updated the call sites like etb_update_buffer() to have proper checks for barrier_pkt size before read but missed updating tmc_update_etf_buffer() which still reads barrier_pkt past the array size resulting in KASAN out-of-bounds bug. Fix this by adding a check for barrier_pkt size before accessing like it is done in etb_update_buffer().

BUG: KASAN: global-out-of-bounds in tmc_update_etf_buffer+0x4b8/0x698 Read of size 4 at addr ffffffd05b7d1030 by task perf/2629

Call trace: dump_backtrace+0x0/0x27c show_stack+0x20/0x2c dump_stack+0x11c/0x188 print_address_description+0x3c/0x4a4 __kasan_report+0x140/0x164 kasan_report+0x10/0x18 __asan_report_load4_noabort+0x1c/0x24 tmc_update_etf_buffer+0x4b8/0x698 etm_event_stop+0x248/0x2d8 etm_event_del+0x20/0x2c event_sched_out+0x214/0x6f0 group_sched_out+0xd0/0x270 ctx_sched_out+0x2ec/0x518 __perf_event_task_sched_out+0x4fc/0xe6c __schedule+0x1094/0x16a0 preempt_schedule_irq+0x88/0x170 arm64_preempt_schedule_irq+0xf0/0x18c el1_irq+0xe8/0x180 perf_event_exec+0x4d8/0x56c setup_new_exec+0x204/0x400 load_elf_binary+0x72c/0x18c0 search_binary_handler+0x13c/0x420 load_script+0x500/0x6c4 search_binary_handler+0x13c/0x420 exec_binprm+0x118/0x654 __do_execve_file+0x77c/0xba4 __arm64_compat_sys_execve+0x98/0xac el0_svc_common+0x1f8/0x5e0 el0_svc_compat_handler+0x84/0xb0 el0_svc_compat+0x10/0x50

The buggy address belongs to the variable: barrier_pkt+0x10/0x40

Memory state around the buggy address: ffffffd05b7d0f00: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00 ffffffd05b7d0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffd05b7d1000: 00 00 00 00 00 00 fa fa fa fa fa fa 00 00 00 03 ^ ffffffd05b7d1080: fa fa fa fa 00 02 fa fa fa fa fa fa 03 fa fa fa ffffffd05b7d1100: fa fa fa fa 00 00 00 00 05 fa fa fa fa fa fa fa ==================================================================

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before 04bd77ef4f4d9fc6102023b85f4590fc2130aac5Affected 0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before ef0a06acc6b16388640ad367eedfa2a17f1945dbAffected 0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before 35c1c4bd2d59ad734129d4e232af9d1098023918Affected 0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before 733d4d95c0101d5f277b8e4910411d016e49a9dcAffected 0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before 0115687be7b13993066aef602253a53d55f5b11fAffected 0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before 5fae8a946ac2df879caf3f79a193d4766d00239bAffected
LinuxLinux	4.14Affected before 4.14Not affected 4.19.198 through 4.19.Not affected 5.4.133 through 5.4.Not affected 5.10.51 through 5.10.Not affected 5.12.18 through 5.12.Not affected 5.13.3 through 5.13.*Not affected 5.14 and laterNot affected

Product

Versions

LinuxLinux

0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before 04bd77ef4f4d9fc6102023b85f4590fc2130aac5Affected
0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before ef0a06acc6b16388640ad367eedfa2a17f1945dbAffected
0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before 35c1c4bd2d59ad734129d4e232af9d1098023918Affected
0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before 733d4d95c0101d5f277b8e4910411d016e49a9dcAffected
0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before 0115687be7b13993066aef602253a53d55f5b11fAffected
0c3fc4d5fa26092853278145aca9b21fa52a3e93 to before 5fae8a946ac2df879caf3f79a193d4766d00239bAffected

LinuxLinux

4.14Affected
before 4.14Not affected
4.19.198 through 4.19.*Not affected
5.4.133 through 5.4.*Not affected
5.10.51 through 5.10.*Not affected
5.12.18 through 5.12.*Not affected
5.13.3 through 5.13.*Not affected
5.14 and laterNot affected

References

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