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Message-ID: <TYVPR01MB11245A06AA4A22CE6A1B5676792D0A@TYVPR01MB11245.jpnprd01.prod.outlook.com> Date: Sun, 15 Oct 2023 22:50:25 +0000 From: <nobuhiro1.iwamatsu@...hiba.co.jp> To: <gustavoars@...nel.org>, <mturquette@...libre.com>, <sboyd@...nel.org> CC: <keescook@...omium.org>, <linux-clk@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org> Subject: RE: [PATCH 2/2][next] clk: visconti: Add bounds-checking coverage for struct visconti_pll_provider Hi Gustavo A. R. Silva, Thanks for your patch! > -----Original Message----- > From: Gustavo A. R. Silva <gustavoars@...nel.org> > Sent: Thursday, October 12, 2023 11:19 AM > To: Michael Turquette <mturquette@...libre.com>; Stephen Boyd > <sboyd@...nel.org>; iwamatsu nobuhiro(岩松 信洋 ○DITC□DIT○O > ST) <nobuhiro1.iwamatsu@...hiba.co.jp> > Cc: Kees Cook <keescook@...omium.org>; linux-clk@...r.kernel.org; > linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; Gustavo A. > R. Silva <gustavoars@...nel.org>; linux-hardening@...r.kernel.org > Subject: [PATCH 2/2][next] clk: visconti: Add bounds-checking coverage for > struct visconti_pll_provider > > In order to gain the bounds-checking coverage that __counted_by provides to > flexible-array members at run-time via CONFIG_UBSAN_BOUNDS (for array > indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family > functions), we must make sure that the counter member, in this particular case > `num`, is updated before the first access to the flex-array member, in this > particular case array `hws`. See below: > > commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with > __counted_by") introduced `__counted_by` for `struct clk_hw_onecell_data` > together with changes to relocate some of assignments of counter `num` > before `hws` is accessed: > > include/linux/clk-provider.h: > 1380 struct clk_hw_onecell_data { > 1381 unsigned int num; > 1382 struct clk_hw *hws[] __counted_by(num); > 1383 }; > > However, this structure is used as a member in other structs, in this case in > `struct visconti_pll_provider`: > > drivers/clk/visconti/pll.h: > 16 struct visconti_pll_provider { > 17 void __iomem *reg_base; > 18 struct device_node *node; > 19 > 20 /* Must be last */ > 21 struct clk_hw_onecell_data clk_data; > 22 }; > > Hence, we need to move the assignments to `ctx->clk_data.num` after > allocation for `struct visconti_pll_provider` and before accessing the flexible > array `ctx->clk_data.hws`. And, as assignments for all members in `struct > visconti_pll_provider` are originally adjacent to each other, relocate all > assignments together, so we don't split up `ctx->clk_data.hws = nr_plls` from > the rest. :) > > Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org> Acked-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp> Best regards, Nobuhiro
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