php-fpm fails to monitor PHP scripts, printing "Operation not permitted" message

Solution Verified - Updated -

Issue

  • On systems executing a HTTP server and php-fpm, php-fpm fails to monitor PHP scripts and prints the following messages in its log file (e.g. /var/opt/rh/rh-php73/log/php-fpm/error.log)

    ERROR: failed to ptrace(ATTACH) child ZZZ: Operation not permitted (1)

    The following AVC can be seen (example with RHEL7 where php-fpm is delivered through Software Collection Library)

    type=AVC msg=audit(...): avc:  denied  { sys_ptrace } for  pid=XXX comm="php-fpm" capability=19  scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:system_r:httpd_t:s0 tclass=capability permissive=0
type=SYSCALL msg=audit(... syscall=101 success=no exit=-1 a0=10 a1=ZZZ a2=0 a3=0 items=0 ppid=1 pid=XXX ... comm="php-fpm" exe="/opt/rh/rh-php73/root/usr/sbin/php-fpm" subj=system_u:system_r:httpd_t:s0 key=(null)

Environment

  • Red Hat Enterprise Linux (RHEL)
    • 7
    • 8
    • 9
  • rh-php73-php-fpm (part of Software Collection Library, only RHEL 7)
  • php-fpm

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