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Re: [PATCH] xen/spinlock: Fix UBSAN "load of address with insufficient space" in lock_prof_init()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Mon, 14 Oct 2024 17:12:04 +0200
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- Cc: Jan Beulich <JBeulich@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 14 Oct 2024 15:12:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.10.24 16:57, Andrew Cooper wrote:
UBSAN complains:
(XEN)
================================================================================
(XEN) UBSAN: Undefined behaviour in common/spinlock.c:794:10
(XEN) load of address ffff82d040ae24c8 with insufficient space
(XEN) for an object of type 'struct lock_profile *'
(XEN) ----[ Xen-4.20-unstable x86_64 debug=y ubsan=y Tainted: C ]----
This shows up with GCC-14, but not with GCC-12. I have not bisected further.
Either way, the types for __lock_profile_{start,end} are incorrect.
They are an array of struct lock_profile pointers. Correct the extern's
types, and adjust the loop to match.
No practical change.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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