CVE-2021-47618 Information

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 : ecd63af8 ip : 00000004 fp : c0a7c30c r10: 00000000 r9 : c30897f4 r8 : ecd63cd4 r7 : 0000000f r6 : 0000000a r5 : e59fa090 r4 : ecd63c98 r3 : c06ae294 r2 : 00000000 r1 : b7611300 r0 : bf4ec008 Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user Control: 32c5387d Table: 2d546400 DAC: 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)

Reference

https://git.kernel.org/stable/c/1515e72aae803fc6b466adf918e71c4e4c9d5b3d https://git.kernel.org/stable/c/ba1863be105b06e10d0e2f6b1b8a0570801cfc71 https://git.kernel.org/stable/c/8b59b0a53c840921b625378f137e88adfa87647e