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Message-ID: <202310031645.FBD5955@keescook> Date: Tue, 3 Oct 2023 16:45:52 -0700 From: Kees Cook <keescook@...omium.org> To: Justin Stitt <justinstitt@...gle.com> Cc: Sathya Prakash <sathya.prakash@...adcom.com>, Sreekanth Reddy <sreekanth.reddy@...adcom.com>, Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>, MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH v2] scsi: message: fusion: replace deprecated strncpy with strscpy On Tue, Oct 03, 2023 at 10:15:45PM +0000, Justin Stitt wrote: > `strncpy` is deprecated for use on NUL-terminated destination strings > [1] and as such we should prefer more robust and less ambiguous string > interfaces. > > The only caller of mptsas_exp_repmanufacture_info() is > mptsas_probe_one_phy() which can allocate rphy in either > sas_end_device_alloc() or sas_expander_alloc(). Both of which > zero-allocate: > | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); > ... this is supplied to mptsas_exp_repmanufacture_info() as edev meaning > that no future NUL-padding of edev members is needed. > > Considering the above, a suitable replacement is `strscpy` [2] due to > the fact that it guarantees NUL-termination on the destination buffer > without unnecessarily NUL-padding. > > Also use the more idiomatic strscpy pattern of (dest, src, sizeof(dest)) > > Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] > Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] > Link: https://github.com/KSPP/linux/issues/90 > Cc: linux-hardening@...r.kernel.org > Cc: Kees Cook <keescook@...omium.org> > Signed-off-by: Justin Stitt <justinstitt@...gle.com> Thanks for adjusting the sizes. Looks good! Reviewed-by: Kees Cook <keescook@...omium.org> -- Kees Cook
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