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Commit e0129ef9 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
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ptrace: PTRACE_GETFDPIC: fix the unsafe usage of child->mm



Now that Mike Frysinger unified the FDPIC ptrace code, we can fix the
unsafe usage of child->mm in ptrace_request(PTRACE_GETFDPIC).

We have the reference to task_struct, and ptrace_check_attach() verified
the tracee is stopped.  But nothing can protect from SIGKILL after that,
we must not assume child->mm != NULL.

Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
Acked-by: default avatarMike Frysinger <vapier.adi@gmail.com>
Acked-by: default avatarDavid Howells <dhowells@redhat.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Greg Ungerer <gerg@snapgear.com>
Acked-by: default avatarRoland McGrath <roland@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9c1a1259
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