XPost: linux.debian.kernel

Control: tags -1 + fixed-upstream

On Fri, Feb 21, 2025 at 09:43:34PM +0000, Martin Kelly wrote:

On Fri, 2025-02-21 at 21:03 +0100, Salvatore Bonaccorso wrote:

Essentially this has to do with ftrace and weak functions.

As I understand this is still an issue in 6.12.15-1.

That's correct; 6.12.15 should still be impacted, as long as CONFIG_X86_KERNEL_IBT is set. CONFIG_X86_KERNEL_IBT changes the
function prologue in a way that causes this issue when combined with an certain fentry bug.

I confirmed this issue is fixed with this patch series: https://lore.kernel.org/bpf/20250218195918.255228630@goodmis.org/
Since that fixes the underlying fentry bug.

I would guess that series will merge into 6.15, but we'll have to see.

AFAICS, this has been merged for 6.15-rc1 with https://git.kernel.org/linus/dd161f74f8198c62f9bcf893f72c64bbb0d68b25

Not sure they will be backported down to 6.12.y.

Regards,
Salvatore

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