CVE-2022-50266

Summary

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

kprobes: Fix check for probe enabled in kill_kprobe()

In kill_kprobe(), the check whether disarm_kprobe_ftrace() needs to be called always fails. This is because before that we set the KPROBE_FLAG_GONE flag for kprobe so that "!kprobe_disabled(p)" is always false.

The disarm_kprobe_ftrace() call introduced by commit:

0cb2f1372baa ("kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler")

to fix the NULL pointer reference problem. When the probe is enabled, if we do not disarm it, this problem still exists.

Fix it by putting the probe enabled check before setting the KPROBE_FLAG_GONE flag.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3031313eb3d549b7ad6f9fbcc52ba04412e3eb9e < f20a067f13106565816b4b6a6b665b2088a63824affected
LinuxLinux3031313eb3d549b7ad6f9fbcc52ba04412e3eb9e < c909985dd0c0f74b61e3f8f0e04bf8aa9c8b97c7affected
LinuxLinux3031313eb3d549b7ad6f9fbcc52ba04412e3eb9e < 0c76ef3f26d5ef2ac2c21b47e7620cff35809fbbaffected
LinuxLinux3c5f8d371b7fef3e3714c4a062c7f3b4aa41d122affected
LinuxLinux9b55d84deec88c02b053a819acf08a6d471dda02affected
LinuxLinux2295608b44c91df767a5c68027f9c9e52ecb28e7affected
LinuxLinuxce7ff920092130f249b75f9fe177edb3362fefe8affected
LinuxLinux3995f7a60feceba6c8f762f4aff3184f90a1291daffected
LinuxLinux247c62ebdfae450bb76dd89cd4724df6be07df75affected
LinuxLinux4.4.238 < 4.5affected
LinuxLinux4.9.238 < 4.10affected
LinuxLinux4.14.200 < 4.15affected
LinuxLinux4.19.149 < 4.20affected
LinuxLinux5.4.69 < 5.5affected
LinuxLinux5.8.13 < 5.9affected
LinuxLinux5.9affected
LinuxLinux0 < 5.9unaffected
LinuxLinux6.0.16 <= 6.0.*unaffected
LinuxLinux6.1.2 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

References