On 5/19/22 11:14 AM, Eugene Syromiatnikov wrote:
Check that size would not overflow before calculation (and return -EOVERFLOW if it will), to prevent potential out-of-bounds write with the following copy_from_user. Add the same check to kprobe_multi_resolve_syms in case it will be called from elsewhere in the future. The INT_MAX checks are performed in order to avoid triggering kvmalloc_node warning [1]. [1] https://lore.kernel.org/lkml/cfe6abea-8d00-8f8c-f84c-e6f27753b5d1@xxxxxx/ Fixes: 0dcac272540613d4 ("bpf: Add multi kprobe link") Signed-off-by: Eugene Syromiatnikov <esyr@xxxxxxxxxx>
Acked-by: Yonghong Song <yhs@xxxxxx>
