| Message ID | Yyy31OuBza1FJCXP@work |
|---|---|
| State | New |
| Headers | show |
| Series | scsi: pm8001: Replace one-element array with flexible-array member | expand |
On Thu, Sep 22, 2022 at 9:30 PM Gustavo A. R. Silva <gustavoars@kernel.org> wrote: > > One-element arrays are deprecated, and we are replacing them with flexible > array members instead. So, replace one-element array with flexible-array > member in struct fw_control_info. > > This helps with the ongoing efforts to tighten the FORTIFY_SOURCE > routines on memcpy() and help us make progress towards globally > enabling -fstrict-flex-arrays=3 [1]. > > Link: https://github.com/KSPP/linux/issues/79 > Link: https://github.com/KSPP/linux/issues/207 > Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 [1] > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Acked-by: Jack Wang <jinpu.wang@ionos.com> > --- > drivers/scsi/pm8001/pm8001_sas.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h > index c5e3f380a01c..b08f52673889 100644 > --- a/drivers/scsi/pm8001/pm8001_sas.h > +++ b/drivers/scsi/pm8001/pm8001_sas.h > @@ -612,7 +612,7 @@ struct fw_control_info { > operations.*/ > u32 reserved;/* padding required for 64 bit > alignment */ > - u8 buffer[1];/* Start of buffer */ > + u8 buffer[];/* Start of buffer */ > }; > struct fw_control_ex { > struct fw_control_info *fw_control; > -- > 2.34.1 >
On Thu, Sep 22, 2022 at 02:30:28PM -0500, Gustavo A. R. Silva wrote: > One-element arrays are deprecated, and we are replacing them with flexible > array members instead. So, replace one-element array with flexible-array > member in struct fw_control_info. I think this changelog should include some explanation of why this change is safe. As far as I can see, it would be: This is the only change needed; struct fw_control_info is only ever used for casting to existing allocations. No sizeof() is used on any of the resulting variables. > This helps with the ongoing efforts to tighten the FORTIFY_SOURCE > routines on memcpy() and help us make progress towards globally > enabling -fstrict-flex-arrays=3 [1]. > > Link: https://github.com/KSPP/linux/issues/79 > Link: https://github.com/KSPP/linux/issues/207 > Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 [1] > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Another one down! :) Reviewed-by: Kees Cook <keescook@chromium.org>
Gustavo, > One-element arrays are deprecated, and we are replacing them with > flexible array members instead. So, replace one-element array with > flexible-array member in struct fw_control_info. Applied to 6.1/scsi-staging, thanks!
diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h index c5e3f380a01c..b08f52673889 100644 --- a/drivers/scsi/pm8001/pm8001_sas.h +++ b/drivers/scsi/pm8001/pm8001_sas.h @@ -612,7 +612,7 @@ struct fw_control_info { operations.*/ u32 reserved;/* padding required for 64 bit alignment */ - u8 buffer[1];/* Start of buffer */ + u8 buffer[];/* Start of buffer */ }; struct fw_control_ex { struct fw_control_info *fw_control;
One-element arrays are deprecated, and we are replacing them with flexible array members instead. So, replace one-element array with flexible-array member in struct fw_control_info. This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines on memcpy() and help us make progress towards globally enabling -fstrict-flex-arrays=3 [1]. Link: https://github.com/KSPP/linux/issues/79 Link: https://github.com/KSPP/linux/issues/207 Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 [1] Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> --- drivers/scsi/pm8001/pm8001_sas.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)