APPLIED: [SRU][N/Q][PATCH 0/1] Fix net:tap.c error "buffer overflow detected"

[Stefan Bader]

On 07/01/2026 19:21, Alice C. Munduruca wrote:
> [ Impact ]
> 
> Currently the kernel testing infrastructure fails consistently
> on net:tap.c, since our C toolchain defaults to
> `-D_FORTIFY_SOURCE=3`. This causes some issues when checked
> functions such as strcpy() are used on kernel objects which do
> not match the standard object model expected by the glibc checked
> functions.
> 
> Use an unchecked function such as memcpy() instead so that none
> of the issues described above manifest.
> 
> [ Fix ]
> 
> resolute: Will be pulled in from upstream
> questing: Cherry picked from 6.19-rc4
> noble: Cherry picked from 6.19-rc4
> jammy: N/A
> 
> [ Tests ]
> 
> Compiled and pass-tested on amd64.
> 
> [ Where problems could occur ]
> 
> No real kernel regression potential as this is a kselftest,
> although, since the original test author did not respond for
> comment during the patch review process, it is possible that
> the merge of `rtattr_add_str` and `rtattr_add_strsz` would
> cause some issues, although this is discussed in the commit
> message.
> 
> Alice C. Munduruca (1):
>    selftests: net: fix "buffer overflow detected" for tap.c
> 
>   tools/testing/selftests/net/tap.c | 16 +++++-----------
>   1 file changed, 5 insertions(+), 11 deletions(-)
> 


Applied to questing,noble:linux/master-next. Thanks.

-Stefan

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