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abacd2fe3c
set_dumpable() updates MMF_DUMPABLE_MASK in a non-trivial way to ensure that get_dumpable() can't observe the intermediate state, but this all can't help if multiple threads call set_dumpable() at the same time. And in theory commit_creds()->set_dumpable(SUID_DUMP_ROOT) racing with sys_prctl()->set_dumpable(SUID_DUMP_DISABLE) can result in SUID_DUMP_USER. Change this code to update both bits atomically via cmpxchg(). Note: this assumes that it is safe to mix bitops and cmpxchg. IOW, if, say, an architecture implements cmpxchg() using the locking (like arch/parisc/lib/bitops.c does), then it should use the same locks for set_bit/etc. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Alex Kelly <alex.page.kelly@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Petr Matousek <pmatouse@redhat.com> Cc: Vasily Kulikov <segoon@openwall.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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