tree 847e835edec9208565b8116d338f7e45290bccd3
parent 3666b167ea68997b73dd5b78678a1c3f0d6730bb
author Stanislav Fomichev <sdf@google.com> 1629330735 -0700
committer Daniel Borkmann <daniel@iogearbox.net> 1629410978 +0200

bpf: Use kvmalloc for map values in syscall

Use kvmalloc/kvfree for temporary value when manipulating a map via
syscall. kmalloc might not be sufficient for percpu maps where the value
is big (and further multiplied by hundreds of CPUs).

Can be reproduced with netcnt test on qemu with "-smp 255".

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20210818235216.1159202-1-sdf@google.com