Description
In the Linux kernel, the following vulnerability has been resolved: futex/pi: Plug private futex exec() race The check for private futexes whether the waiter's mm, which is stored in the futex_key and copied into the pi_state, is the same as the owner's mm is not sufficient for exec(). exec() has a gap where the mm check fails to give the correct answer: exec() ... exec_release_mm() futex_exec_release() tsk::futex::exit_state = EXITING; cleanup_robust_list(); 1) tsk::futex::exit_state = OK; ... old_mm = tsk::mm; 2) tsk::mm = ->mm; Between #1 and #2 the check for the mm is wrong as that mm is about to be swapped out and eventually freed. Plug this gap by: 1) Setting tsk::futex::exit_state to FUTEX_STATE_DEAD in futex_exec_release() 2) Setting tsk::futex::exit_state to FUTEX_STATE_OK after the mm has been switched. From a futex point of view the task is dead after it finished the robust list cleanup up to the point where it sets the state to OK again.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
80367ad01d93ac781b0e1df246edaf006928002f to < fdf538b2e69653ff740e84042245018e5680cd7baffected80367ad01d93ac781b0e1df246edaf006928002f to < 0478bc6bf197629fea0331d65b39eeea043c6cf0affected80367ad01d93ac781b0e1df246edaf006928002f to < d7944cee62ec6cca1c90780a766960a57d3b4bb8affected80367ad01d93ac781b0e1df246edaf006928002f to < c5f0bc9fd1cec4a00400cc727fcde03e0fde17ccaffected
Linux Linux
Default version status: affected
6.16affected0 to < 6.16unaffected6.18.47 to ≤ 6.18.*unaffected7.1.11 to ≤ 7.1.*unaffected7.2.1 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected