Vulnerability CVE-2024-35905

Vulnerability CVE-2024-35905

Published: 2024-05-19

Description:

In the Linux kernel, the following vulnerability has been resolved:

bpf: Protect against int overflow for stack access size

This patch re-introduces protection against the size of access to stack
memory being negative; the access size can appear negative as a result
of overflowing its signed int representation. This should not actually
happen, as there are other protections along the way, but we should
protect against it anyway. One code path was missing such protections
(fixed in the previous patch in the series), causing out-of-bounds array
accesses in check_stack_range_initialized(). This patch causes the
verification of a program with such a non-sensical access size to fail.

This check used to exist in a more indirect way, but was inadvertendly
removed in a833a17aeac7.

References:

https://git.kernel.org/stable/c/9970e059af471478455f9534e8c3db82f8c5496d

https://git.kernel.org/stable/c/37dc1718dc0c4392dbfcb9adec22a776e745dd69

https://git.kernel.org/stable/c/98cdac206b112bec63852e94802791e316acc2c1

https://git.kernel.org/stable/c/3f0784b2f1eb9147973d8c43ba085c5fdf44ff69

https://git.kernel.org/stable/c/203a68151e8eeb331d4a64ab78303f3a15faf103

https://git.kernel.org/stable/c/ecc6a2101840177e57c925c102d2d29f260d37c8

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