SUSE: CVE-2021-47618: SUSE Linux Security Advisory

SUSE: CVE-2021-47618: SUSE Linux Security Advisory

Severity

4

CVSS

(AV:L/AC:M/Au:N/C:P/I:P/A:P)

Published

06/20/2024

Created

08/16/2024

Added

08/09/2024

Modified

08/09/2024

Description

In the Linux kernel, the following vulnerability has been resolved: ARM: 9170/1: fix panic when kasan and kprobe are enabled arm32 uses software to simulate the instruction replaced by kprobe. some instructions may be simulated by constructing assembly functions. therefore, before executing instruction simulation, it is necessary to construct assembly function execution environment in C language through binding registers. after kasan is enabled, the register binding relationship will be destroyed, resulting in instruction simulation errors and causing kernel panic. the kprobe emulate instruction function is distributed in three files: actions-common.c actions-arm.c actions-thumb.c, so disable KASAN when compiling these files. for example, use kprobe insert on cap_capable+20 after kasan enabled, the cap_capable assembly code is as follows: <cap_capable>: e92d47f0 push {r4, r5, r6, r7, r8, r9, sl, lr} e1a05000 mov r5, r0 e280006c add r0, r0, #108; 0x6c e1a04001 mov r4, r1 e1a06002 mov r6, r2 e59fa090 ldr sl, [pc, #144]; ebfc7bf8 bl c03aa4b4 <__asan_load4> e595706c ldr r7, [r5, #108]; 0x6c e2859014 add r9, r5, #20 ...... The emulate_ldr assembly code after enabling kasan is as follows: c06f1384 <emulate_ldr>: e92d47f0 push {r4, r5, r6, r7, r8, r9, sl, lr} e282803c add r8, r2, #60 ; 0x3c e1a05000 mov r5, r0 e7e37855 ubfx r7, r5, #16, #4 e1a00008 mov r0, r8 e1a09001 mov r9, r1 e1a04002 mov r4, r2 ebf35462 bl c03c6530 <__asan_load4> e357000f cmp r7, #15 e7e36655 ubfx r6, r5, #12, #4 e205a00f and sl, r5, #15 0a000001 beq c06f13bc <emulate_ldr+0x38> e0840107 add r0, r4, r7, lsl #2 ebf3545c bl c03c6530 <__asan_load4> e084010a add r0, r4, sl, lsl #2 ebf3545a bl c03c6530 <__asan_load4> e2890010 add r0, r9, #16 ebf35458 bl c03c6530 <__asan_load4> e5990010 ldr r0, [r9, #16] e12fff30 blx r0 e356000f cm r6, #15 1a000014 bne c06f1430 <emulate_ldr+0xac> e1a06000 mov r6, r0 e2840040 add r0, r4, #64 ; 0x40 ...... when running in emulate_ldr to simulate the ldr instruction, panic occurred, and the log is as follows: Unable to handle kernel NULL pointer dereference at virtual address 00000090 pgd = ecb46400 [00000090] *pgd=2e0fa003, *pmd=00000000 Internal error: Oops: 206 [#1] SMP ARM PC is at cap_capable+0x14/0xb0 LR is at emulate_ldr+0x50/0xc0 psr: 600d0293 sp : ecd63af8ip : 00000004fp : c0a7c30c r10: 00000000r9 : c30897f4r8 : ecd63cd4 r7 : 0000000fr6 : 0000000ar5 : e59fa090r4 : ecd63c98 r3 : c06ae294r2 : 00000000r1 : b7611300r0 : bf4ec008 Flags: nZCvIRQs offFIQs onMode SVC_32ISA ARMSegment user Control: 32c5387dTable: 2d546400DAC: 55555555 Process bash (pid: 1643, stack limit = 0xecd60190) (cap_capable) from (kprobe_handler+0x218/0x340) (kprobe_handler) from (kprobe_trap_handler+0x24/0x48) (kprobe_trap_handler) from (do_undefinstr+0x13c/0x364) (do_undefinstr) from (__und_svc_finish+0x0/0x30) (__und_svc_finish) from (cap_capable+0x18/0xb0) (cap_capable) from (cap_vm_enough_memory+0x38/0x48) (cap_vm_enough_memory) from (security_vm_enough_memory_mm+0x48/0x6c) (security_vm_enough_memory_mm) from (copy_process.constprop.5+0x16b4/0x25c8) (copy_process.constprop.5) from (_do_fork+0xe8/0x55c) (_do_fork) from (SyS_clone+0x1c/0x24) (SyS_clone) from (__sys_trace_return+0x0/0x10) Code: 0050a0e1 6c0080e2 0140a0e1 0260a0e1 (f801f0e7)

Solution(s)

• suse-upgrade-cluster-md-kmp-azure
• suse-upgrade-cluster-md-kmp-rt
• suse-upgrade-dlm-kmp-azure
• suse-upgrade-dlm-kmp-rt
• suse-upgrade-gfs2-kmp-azure
• suse-upgrade-gfs2-kmp-rt
• suse-upgrade-kernel-64kb
• suse-upgrade-kernel-64kb-devel
• suse-upgrade-kernel-azure
• suse-upgrade-kernel-azure-devel
• suse-upgrade-kernel-azure-extra
• suse-upgrade-kernel-azure-livepatch-devel
• suse-upgrade-kernel-azure-optional
• suse-upgrade-kernel-azure-vdso
• suse-upgrade-kernel-default
• suse-upgrade-kernel-default-base
• suse-upgrade-kernel-default-devel
• suse-upgrade-kernel-devel
• suse-upgrade-kernel-devel-azure
• suse-upgrade-kernel-devel-rt
• suse-upgrade-kernel-docs
• suse-upgrade-kernel-macros
• suse-upgrade-kernel-obs-build
• suse-upgrade-kernel-preempt
• suse-upgrade-kernel-preempt-devel
• suse-upgrade-kernel-rt
• suse-upgrade-kernel-rt-devel
• suse-upgrade-kernel-rt-extra
• suse-upgrade-kernel-rt-livepatch
• suse-upgrade-kernel-rt-livepatch-devel
• suse-upgrade-kernel-rt-optional
• suse-upgrade-kernel-rt-vdso
• suse-upgrade-kernel-rt_debug
• suse-upgrade-kernel-rt_debug-devel
• suse-upgrade-kernel-rt_debug-livepatch-devel
• suse-upgrade-kernel-rt_debug-vdso
• suse-upgrade-kernel-source
• suse-upgrade-kernel-source-azure
• suse-upgrade-kernel-source-rt
• suse-upgrade-kernel-syms
• suse-upgrade-kernel-syms-azure
• suse-upgrade-kernel-syms-rt
• suse-upgrade-kernel-zfcpdump
• suse-upgrade-kselftests-kmp-azure
• suse-upgrade-kselftests-kmp-rt
• suse-upgrade-ocfs2-kmp-azure
• suse-upgrade-ocfs2-kmp-rt
• suse-upgrade-reiserfs-kmp-azure
• suse-upgrade-reiserfs-kmp-default
• suse-upgrade-reiserfs-kmp-rt

References

• https://attackerkb.com/topics/cve-2021-47618
• CVE - 2021-47618