Re: [PATCH] bpf: Fix backport of "bpf: restrict unknown scalars of mixed signed bounds for unprivileged"

Yonghong Song
2021-04-20T00:37:34Z

On 4/19/21 4:56 PM, Samuel Mendoza-Jonas wrote:
> The 4.14 backport of 9d7eceede ("bpf: restrict unknown scalars of mixed
> signed bounds for unprivileged") adds the PTR_TO_MAP_VALUE check to the
> wrong location in adjust_ptr_min_max_vals(), most likely because 4.14
> doesn't include the commit that updates the if-statement to a
> switch-statement (aad2eeaf4 "bpf: Simplify ptr_min_max_vals adjustment").
>
> Move the check to the proper location in adjust_ptr_min_max_vals().
>
> Fixes: 17efa65350c5a ("bpf: restrict unknown scalars of mixed signed bounds for unprivileged")
> Signed-off-by: Samuel Mendoza-Jonas <samjonas@amazon.com>
> Reviewed-by: Frank van der Linden <fllinden@amazon.com>
> Reviewed-by: Ethan Chen <yishache@amazon.com>

Just to be clear, the patch is for 4.14 stable branch.

Acked-by: Yonghong Song <yhs@fb.com>