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| author | Adam Zabrocki <pi3@pi3.com.pl> | 2022-04-22 18:40:27 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-04-26 16:09:36 +0200 |
| commit | 1d661ed54d8613c97bcff2c7d6181c61e482a1da (patch) | |
| tree | f126c3bcc98255dfed064c1ac7a95fc58e771613 /include/net/xsk_buff_pool.h | |
| parent | b02d196c44ead1a5949729be9ff08fe781c3e48a (diff) | |
| download | lwn-1d661ed54d8613c97bcff2c7d6181c61e482a1da.tar.gz lwn-1d661ed54d8613c97bcff2c7d6181c61e482a1da.zip | |
kprobes: Fix KRETPROBES when CONFIG_KRETPROBE_ON_RETHOOK is set
The recent kernel change in 73f9b911faa7 ("kprobes: Use rethook for kretprobe
if possible"), introduced a potential NULL pointer dereference bug in the
KRETPROBE mechanism. The official Kprobes documentation defines that "Any or
all handlers can be NULL". Unfortunately, there is a missing return handler
verification to fulfill these requirements and can result in a NULL pointer
dereference bug.
This patch adds such verification in kretprobe_rethook_handler() function.
Fixes: 73f9b911faa7 ("kprobes: Use rethook for kretprobe if possible")
Signed-off-by: Adam Zabrocki <pi3@pi3.com.pl>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.ibm.com>
Cc: Anil S. Keshavamurthy <anil.s.keshavamurthy@intel.com>
Link: https://lore.kernel.org/bpf/20220422164027.GA7862@pi3.com.pl
Diffstat (limited to 'include/net/xsk_buff_pool.h')
0 files changed, 0 insertions, 0 deletions