Hari Bathini wrote:
Running program with bpf-to-bpf function calls results in data access
exception (0x300) with the below call trace:
[c000000000113f28] bpf_int_jit_compile+0x238/0x750 (unreliable)
[c00000000037d2f8] bpf_check+0x2008/0x2710
[c000000000360050] bpf_prog_load+0xb00/0x13a0
[c000000000361d94] __sys_bpf+0x6f4/0x27c0
[c000000000363f0c] sys_bpf+0x2c/0x40
[c000000000032434] system_call_exception+0x164/0x330
[c00000000000c1e8] system_call_vectored_common+0xe8/0x278
as bpf_int_jit_compile() tries writing to write protected JIT code
location during the extra pass.
Fix it by holding off write protection of JIT code until the extra
pass, where branch target addresses fixup happens.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 62e3d4210ac9 ("powerpc/bpf: Write protect JIT code")
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxx>
---
arch/powerpc/net/bpf_jit_comp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Thanks for the fix!
Reviewed-by: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
