Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:ACPI: PAD: fix crash in exit_round_robin()The kernel occasionally crashes in cpumask_clear_cpu(), which is calledwit
hin exit_round_robin(), because when executing clear_bit(nr, addr) withnr set to 0xffffffff, the address calculation may cause misalignment withinthe memory, leading to access to an i
nvalid memory address.----------BUG: unable to handle kernel paging request at ffffffffe0740618        ...CPU: 3 PID: 2919323 Comm: acpi_pad/14 Kdump: loaded Tainted: G           OE  
X --------- -  - 4.18.0-425.19.2.el8_7.x86_64 #1        ...RIP: 0010:power_saving_thread+0x313/0x411 [acpi_pad]Code: 89 cd 48 89 d3 eb d1 48 c7 c7 55 70 72 c0 e8 64 86 b0 e4 c6 05 0d 
a1 02 00 01 e9 bc fd ff ff 45 89 e4 42 8b 04 a5 20 82 72 c0 <f0> 48 0f b3 05 f4 9c 01 00 42 c7 04 a5 20 82 72 c0 ff ff ff ff 31RSP: 0018:ff72a5d51fa77ec8 EFLAGS: 00010202RAX: 00000000
ffffffff RBX: ff462981e5d8cb80 RCX: 0000000000000000RDX: 0000000000000000 RSI: 0000000000000246 RDI: 0000000000000246RBP: ff46297556959d80 R08: 0000000000000382 R09: ff46297c8d0f38d8R
10: 0000000000000000 R11: 0000000000000001 R12: 000000000000000eR13: 0000000000000000 R14: ffffffffffffffff R15: 000000000000000eFS:  0000000000000000(0000) GS:ff46297a800c0000(0000) 
knlGS:0000000000000000CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: ffffffffe0740618 CR3: 0000007e20410004 CR4: 0000000000771ee0DR0: 0000000000000000 DR1: 0000000000000000 DR2
: 0000000000000000DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400PKRU: 55555554Call Trace: ? acpi_pad_add+0x120/0x120 [acpi_pad] kthread+0x10b/0x130 ? set_kthread_st
ruct+0x50/0x50 ret_from_fork+0x1f/0x40        ...CR2: ffffffffe0740618crash> dis -lr ffffffffc0726923        .../usr/src/debug/kernel-4.18.0-425.19.2.el8_7/linux-4.18.0-425.19.2.el8_7
.x86_64/./include/linux/cpumask.h: 1140xffffffffc0726918 <power_saving_thread+776>:     mov    %r12d,%r12d/usr/src/debug/kernel-4.18.0-425.19.2.el8_7/linux-4.18.0-425.19.2.el8_7.x86_6
4/./include/linux/cpumask.h: 3250xffffffffc072691b <power_saving_thread+779>:   mov    -0x3f8d7de0(,%r12,4),%eax/usr/src/debug/kernel-4.18.0-425.19.2.el8_7/linux-4.18.0-425.19.2.el8_7
.x86_64/./arch/x86/include/asm/bitops.h: 800xffffffffc0726923 <power_saving_thread+787>:        lock btr %rax,0x19cf4(%rip)        # 0xffffffffc0740620 <pad_busy_cpus_bits>crash> px t
sk_in_cpu[14]$66 = 0xffffffffcrash> px 0xffffffffc072692c+0x19cf4$99 = 0xffffffffc0740620crash> sym 0xffffffffc0740620ffffffffc0740620 (b) pad_busy_cpus_bits [acpi_pad]crash> px pad_b
usy_cpus_bits[0]$42 = 0xfffc0----------To fix this, ensure that tsk_in_cpu[tsk_index] != -1 before callingcpumask_clear_cpu() in exit_round_robin(), just as it is done inround_robin_c
pu().[ rjw: Subject edit, avoid updates to the same value ]

CVEs

• CVE-2024-49935