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Re: [PATCH 3/7] x86/dom0: placate GCC 12 compile-time errors with UBSAN and PVH_GUEST
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 13 Mar 2025 19:35:37 +0000
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Thu, 13 Mar 2025 19:35:56 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13/03/2025 3:30 pm, Roger Pau Monne wrote:
> When building Xen with GCC 12 with UBSAN and PVH_GUEST both enabled the
> compiler emits the following errors:
>
> arch/x86/setup.c: In function '__start_xen':
> arch/x86/setup.c:1504:19: error: 'consider_modules' reading 40 bytes from a
> region of size 4 [-Werror=stringop-overread]
> 1504 | end = consider_modules(s, e, reloc_size + mask,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 1505 | bi->mods, bi->nr_modules, -1);
> | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/x86/setup.c:1504:19: note: referencing argument 4 of type 'const struct
> boot_module[0]'
> arch/x86/setup.c:686:24: note: in a call to function 'consider_modules'
> 686 | static uint64_t __init consider_modules(
> | ^~~~~~~~~~~~~~~~
> arch/x86/setup.c:1535:19: error: 'consider_modules' reading 40 bytes from a
> region of size 4 [-Werror=stringop-overread]
> 1535 | end = consider_modules(s, e, size, bi->mods,
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 1536 | bi->nr_modules + relocated, j);
> | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/x86/setup.c:1535:19: note: referencing argument 4 of type 'const struct
> boot_module[0]'
> arch/x86/setup.c:686:24: note: in a call to function 'consider_modules'
> 686 | static uint64_t __init consider_modules(
> | ^~~~~~~~~~~~~~~~
>
> This seems to be the result of some function manipulation done by UBSAN
> triggering GCC stringops related errors. Placate the errors by declaring
> the function parameter as `const struct *boot_module` instead of `const
> struct boot_module[]`.
>
> Note that GCC 13 seems to be fixed, and doesn't trigger the error when
> using `[]`.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
(I swear I've seen this before, and already fixed it once by switching
to a pointer...)
|
