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author | Jiri Olsa <olsajiri@gmail.com> | 2024-01-03 20:05:46 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-01-25 15:35:46 -0800 |
commit | 8c8bcd45e9b10eef12321f08d2e5be33d615509c (patch) | |
tree | dcb5a8a527f8ff0a303ae679020a6a79e8842406 /scripts/makelst | |
parent | f56e715ef1c19c42c6aa6cb9280947dea13aab2e (diff) | |
download | linux-stable-8c8bcd45e9b10eef12321f08d2e5be33d615509c.tar.gz linux-stable-8c8bcd45e9b10eef12321f08d2e5be33d615509c.tar.bz2 linux-stable-8c8bcd45e9b10eef12321f08d2e5be33d615509c.zip |
bpf: Fix re-attachment branch in bpf_tracing_prog_attach
commit 715d82ba636cb3629a6e18a33bb9dbe53f9936ee upstream.
The following case can cause a crash due to missing attach_btf:
1) load rawtp program
2) load fentry program with rawtp as target_fd
3) create tracing link for fentry program with target_fd = 0
4) repeat 3
In the end we have:
- prog->aux->dst_trampoline == NULL
- tgt_prog == NULL (because we did not provide target_fd to link_create)
- prog->aux->attach_btf == NULL (the program was loaded with attach_prog_fd=X)
- the program was loaded for tgt_prog but we have no way to find out which one
BUG: kernel NULL pointer dereference, address: 0000000000000058
Call Trace:
<TASK>
? __die+0x20/0x70
? page_fault_oops+0x15b/0x430
? fixup_exception+0x22/0x330
? exc_page_fault+0x6f/0x170
? asm_exc_page_fault+0x22/0x30
? bpf_tracing_prog_attach+0x279/0x560
? btf_obj_id+0x5/0x10
bpf_tracing_prog_attach+0x439/0x560
__sys_bpf+0x1cf4/0x2de0
__x64_sys_bpf+0x1c/0x30
do_syscall_64+0x41/0xf0
entry_SYSCALL_64_after_hwframe+0x6e/0x76
Return -EINVAL in this situation.
Fixes: f3a95075549e0 ("bpf: Allow trampoline re-attach for tracing and lsm programs")
Cc: stable@vger.kernel.org
Signed-off-by: Jiri Olsa <olsajiri@gmail.com>
Acked-by: Jiri Olsa <olsajiri@gmail.com>
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Dmitrii Dolgov <9erthalion6@gmail.com>
Link: https://lore.kernel.org/r/20240103190559.14750-4-9erthalion6@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts/makelst')
0 files changed, 0 insertions, 0 deletions