bpf: fix bpf_prog_get_info_by_fd to return 0 func_lens for unpriv

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[ Upstream commit 28c2fae726 ]

While dbecd73884 ("bpf: get kernel symbol addresses via syscall")
zeroed info.nr_jited_ksyms in bpf_prog_get_info_by_fd() for queries
from unprivileged users, commit 815581c11c ("bpf: get JITed image
lengths of functions via syscall") forgot about doing so and therefore
returns the #elems of the user set up buffer which is incorrect. It
also needs to indicate a info.nr_jited_func_lens of zero.

Fixes: 815581c11c ("bpf: get JITed image lengths of functions via syscall")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Sandipan Das <sandipan@linux.vnet.ibm.com>
Cc: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Daniel Borkmann 2018-11-02 11:35:46 +01:00 • committed by Greg Kroah-Hartman

parent 5e4ad7cec8

commit 1a7ccf42cb

1 changed files with 1 additions and 0 deletions

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kernel/bpf/syscall.c

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