From: Hsin-Yi Wang <hsinyi@chromium.org> To: linux-arm-kernel@lists.infradead.org Cc: Rob Herring <robh+dt@kernel.org>, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Frank Rowand <frowand.list@gmail.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Andrew Morton <akpm@linux-foundation.org>, Mike Rapoport <rppt@linux.ibm.com>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Miles Chen <miles.chen@mediatek.com>, Hsin-Yi Wang <hsinyi@chromium.org>, James Morse <james.morse@arm.com>, Andrew Murray <andrew.murray@arm.com>, Mark Rutland <mark.rutland@arm.com>, Jun Yao <yaojun8558363@gmail.com>, Yu Zhao <yuzhao@google.com>, Robin Murphy <robin.murphy@arm.com>, Laura Abbott <labbott@redhat.com>, Stephen Boyd <swboyd@chromium.org>, Kees Cook <keescook@chromium.org> Subject: [PATCH RESEND v7 2/3] fdt: add support for rng-seed Date: Fri, 9 Aug 2019 01:38:05 +0800 [thread overview] Message-ID: <20190808173803.1146-3-hsinyi@chromium.org> (raw) In-Reply-To: <20190808173803.1146-1-hsinyi@chromium.org> Introducing a chosen node, rng-seed, which is an entropy that can be passed to kernel called very early to increase initial device randomness. Bootloader should provide this entropy and the value is read from /chosen/rng-seed in DT. Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Rob Herring <robh@kernel.org> --- drivers/of/fdt.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 9cdf14b9aaab..640c817cf65b 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -24,6 +24,7 @@ #include <linux/debugfs.h> #include <linux/serial_core.h> #include <linux/sysfs.h> +#include <linux/random.h> #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ #include <asm/page.h> @@ -1044,6 +1045,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, { int l; const char *p; + const void *rng_seed; pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); @@ -1078,6 +1080,14 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, pr_debug("Command line is: %s\n", (char*)data); + rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l); + if (rng_seed && l > 0) { + add_device_randomness(rng_seed, l); + + /* try to clear seed so it won't be found. */ + fdt_nop_property(initial_boot_params, node, "rng-seed"); + } + /* break now */ return 1; } -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Hsin-Yi Wang <hsinyi@chromium.org> To: linux-arm-kernel@lists.infradead.org Cc: Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org, Yu Zhao <yuzhao@google.com>, Kees Cook <keescook@chromium.org>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Catalin Marinas <catalin.marinas@arm.com>, Stephen Boyd <swboyd@chromium.org>, Will Deacon <will.deacon@arm.com>, linux-kernel@vger.kernel.org, Mike Rapoport <rppt@linux.ibm.com>, Jun Yao <yaojun8558363@gmail.com>, Miles Chen <miles.chen@mediatek.com>, Rob Herring <robh+dt@kernel.org>, James Morse <james.morse@arm.com>, Hsin-Yi Wang <hsinyi@chromium.org>, Andrew Murray <andrew.murray@arm.com>, Andrew Morton <akpm@linux-foundation.org>, Laura Abbott <labbott@redhat.com>, Frank Rowand <frowand.list@gmail.com>, Robin Murphy <robin.murphy@arm.com> Subject: [PATCH RESEND v7 2/3] fdt: add support for rng-seed Date: Fri, 9 Aug 2019 01:38:05 +0800 [thread overview] Message-ID: <20190808173803.1146-3-hsinyi@chromium.org> (raw) In-Reply-To: <20190808173803.1146-1-hsinyi@chromium.org> Introducing a chosen node, rng-seed, which is an entropy that can be passed to kernel called very early to increase initial device randomness. Bootloader should provide this entropy and the value is read from /chosen/rng-seed in DT. Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Rob Herring <robh@kernel.org> --- drivers/of/fdt.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 9cdf14b9aaab..640c817cf65b 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -24,6 +24,7 @@ #include <linux/debugfs.h> #include <linux/serial_core.h> #include <linux/sysfs.h> +#include <linux/random.h> #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ #include <asm/page.h> @@ -1044,6 +1045,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, { int l; const char *p; + const void *rng_seed; pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); @@ -1078,6 +1080,14 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, pr_debug("Command line is: %s\n", (char*)data); + rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l); + if (rng_seed && l > 0) { + add_device_randomness(rng_seed, l); + + /* try to clear seed so it won't be found. */ + fdt_nop_property(initial_boot_params, node, "rng-seed"); + } + /* break now */ return 1; } -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-08-08 17:39 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-08 17:38 [PATCH RESEND v7 0/3] add support for rng-seed Hsin-Yi Wang 2019-08-08 17:38 ` Hsin-Yi Wang 2019-08-08 17:38 ` [PATCH RESEND v7 1/3] arm64: map FDT as RW for early_init_dt_scan() Hsin-Yi Wang 2019-08-08 17:38 ` Hsin-Yi Wang 2019-08-08 17:38 ` Hsin-Yi Wang [this message] 2019-08-08 17:38 ` [PATCH RESEND v7 2/3] fdt: add support for rng-seed Hsin-Yi Wang 2019-08-08 17:38 ` [PATCH RESEND v7 3/3] arm64: kexec_file: add rng-seed support Hsin-Yi Wang 2019-08-08 17:38 ` Hsin-Yi Wang
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