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Alexei Starovoitov
a27e89673a
Toke Høiland-Jørgensen says: ==================== Fix hash bucket overflow checks for 32-bit arches Syzbot managed to trigger a crash by creating a DEVMAP_HASH map with a large number of buckets because the overflow check relies on well-defined behaviour that is only correct on 64-bit arches. Fix the overflow checks to happen before values are rounded up in all the affected map types. v3: - Keep the htab->n_buckets > U32_MAX / sizeof(struct bucket) check - Use 1UL << 31 instead of U32_MAX / 2 + 1 as the constant to check against - Add patch to fix stackmap.c v2: - Fix off-by-one error in overflow check - Apply the same fix to hashtab, where the devmap_hash code was copied from (John) Toke Høiland-Jørgensen (3): bpf: Fix DEVMAP_HASH overflow check on 32-bit arches bpf: Fix hashtab overflow check on 32-bit arches bpf: Fix stackmap overflow check on 32-bit arches kernel/bpf/devmap.c | 11 ++++++----- kernel/bpf/hashtab.c | 14 +++++++++----- kernel/bpf/stackmap.c | 9 ++++++--- 3 files changed, 21 insertions(+), 13 deletions(-) ==================== Link: https://lore.kernel.org/r/20240307120340.99577-1-toke@redhat.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.