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Date: Mon, 16 May 2016 18:20:25 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jann Horn <jannh@...gle.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 4.5 020/101] bpf: fix double-fdput in replace_map_fd_with_map_ptr() 4.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jann Horn <jannh@...gle.com> [ Upstream commit 8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7 ] When bpf(BPF_PROG_LOAD, ...) was invoked with a BPF program whose bytecode references a non-map file descriptor as a map file descriptor, the error handling code called fdput() twice instead of once (in __bpf_map_get() and in replace_map_fd_with_map_ptr()). If the file descriptor table of the current task is shared, this causes f_count to be decremented too much, allowing the struct file to be freed while it is still in use (use-after-free). This can be exploited to gain root privileges by an unprivileged user. This bug was introduced in commit 0246e64d9a5f ("bpf: handle pseudo BPF_LD_IMM64 insn"), but is only exploitable since commit 1be7f75d1668 ("bpf: enable non-root eBPF programs") because previously, CAP_SYS_ADMIN was required to reach the vulnerable code. (posted publicly according to request by maintainer) Signed-off-by: Jann Horn <jannh@...gle.com> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Acked-by: Alexei Starovoitov <ast@...nel.org> Acked-by: Daniel Borkmann <daniel@...earbox.net> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- kernel/bpf/verifier.c | 1 - 1 file changed, 1 deletion(-) --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -2004,7 +2004,6 @@ static int replace_map_fd_with_map_ptr(s if (IS_ERR(map)) { verbose("fd %d is not pointing to valid bpf_map\n", insn->imm); - fdput(f); return PTR_ERR(map); }
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