From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx49RkFO2nQESLKNYOPiLBoUvzz1t6/dTfRwjrfMxUnhFEKb+o6NvyQPqICpfLv3rl3lI334Z ARC-Seal: i=1; a=rsa-sha256; t=1523021862; cv=none; d=google.com; s=arc-20160816; b=RZHxs+SQzHUJZthTNImUwQrCDMP3iuoEX+7j+Z9rfy4FcTjrRyGZdplp36bh8GlGq8 0fRu40u9I+6TKHuUl0MHliy2/PRYVDtij8atuGYUJ77f3P2saM0p+GTIMM+v5kjB+dcH XUITjl7HkvYhgQQo8dfAGwO5mWdYqZhEwvdARHX3RQD6YLOkCwwFlKDLF8GL75MWSZKA 0u6IQ/WsYD/DEQe5hZU0kGQomf+4A6P8aiqlf4KxAmOkLnCOjVjjaMlC8xOcjFwL7673 VcA1BmXWJ3BvfBgUqmbdg/EenkagkTlVzg1RuneysVrktb4wms0sPQuEPUON17oKK2b+ QURA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=k1wJwr5cuM1NqXytwitgMQFdWybisSAm3QcuE0QbKUs=; b=pD9NPmsZGR016IRB+Nb6oyvC27V8RGEVNGG6oeafxZIy4OptxDo+P0K16GB6Xy7qwA Li4FyJeEqZep39fyBTonr8MRTaig/6QZHomm2pPSOGZMQhm5IfJwJ5cDZx6MGrDa7qJ0 /jCUqYjOldqQ33SXbgg24V5DmKBJWjLlvaJiJp/jCeMQBgZgRa/78ijYaHKas/u9fZrW ine/KHyCS+aHVbvimVcxc1/M84Z+ZjfuGpfpoAuLWf2HRIuiPRGuORUHj/2ZncZkuul8 hPRQ+aS+knQbjvttaBGJDWd7VoXqRMRIPMDxlbmckLIHfWEazCVcMbVk3C81twO0u/5i C/Gw== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Gerlach , Pavel Machek , Tony Lindgren Subject: [PATCH 4.14 01/67] ARM: OMAP: Fix SRAM W+X mapping Date: Fri, 6 Apr 2018 15:23:31 +0200 Message-Id: <20180406084341.408171508@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180406084341.225558262@linuxfoundation.org> References: <20180406084341.225558262@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1597004172006406380?= X-GMAIL-MSGID: =?utf-8?q?1597004172006406380?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tony Lindgren commit eb85a355c3afd9379f5953cfe2df73632d14c884 upstream. We are still using custom SRAM code for some SoCs and are not marking the PM code mapped to SRAM as read-only and executable after we're done. With CONFIG_DEBUG_WX=y, we will get "Found insecure W+X mapping at address" warning. Let's fix this issue the same way as commit 728bbe75c82f ("misc: sram: Introduce support code for protect-exec sram type") is doing for drivers/misc/sram-exec.c. On omap3, we need to restore SRAM when returning from off mode after idle, so init time configuration is not enough. And as we no longer have users for omap_sram_push_address() we can make it static while at it. Note that eventually we should be using sram-exec.c for all SoCs. Cc: stable@vger.kernel.org # v4.12+ Cc: Dave Gerlach Reported-by: Pavel Machek Signed-off-by: Tony Lindgren Signed-off-by: Greg Kroah-Hartman --- arch/arm/plat-omap/include/plat/sram.h | 11 ---------- arch/arm/plat-omap/sram.c | 36 ++++++++++++++++++++++++++++++++- 2 files changed, 36 insertions(+), 11 deletions(-) --- a/arch/arm/plat-omap/include/plat/sram.h +++ b/arch/arm/plat-omap/include/plat/sram.h @@ -5,13 +5,4 @@ void omap_map_sram(unsigned long start, unsigned long skip, int cached); void omap_sram_reset(void); -extern void *omap_sram_push_address(unsigned long size); - -/* Macro to push a function to the internal SRAM, using the fncpy API */ -#define omap_sram_push(funcp, size) ({ \ - typeof(&(funcp)) _res = NULL; \ - void *_sram_address = omap_sram_push_address(size); \ - if (_sram_address) \ - _res = fncpy(_sram_address, &(funcp), size); \ - _res; \ -}) +extern void *omap_sram_push(void *funcp, unsigned long size); --- a/arch/arm/plat-omap/sram.c +++ b/arch/arm/plat-omap/sram.c @@ -23,6 +23,7 @@ #include #include #include +#include #include @@ -42,7 +43,7 @@ static void __iomem *omap_sram_ceil; * Note that fncpy requires the returned address to be aligned * to an 8-byte boundary. */ -void *omap_sram_push_address(unsigned long size) +static void *omap_sram_push_address(unsigned long size) { unsigned long available, new_ceil = (unsigned long)omap_sram_ceil; @@ -60,6 +61,30 @@ void *omap_sram_push_address(unsigned lo return (void *)omap_sram_ceil; } +void *omap_sram_push(void *funcp, unsigned long size) +{ + void *sram; + unsigned long base; + int pages; + void *dst = NULL; + + sram = omap_sram_push_address(size); + if (!sram) + return NULL; + + base = (unsigned long)sram & PAGE_MASK; + pages = PAGE_ALIGN(size) / PAGE_SIZE; + + set_memory_rw(base, pages); + + dst = fncpy(sram, funcp, size); + + set_memory_ro(base, pages); + set_memory_x(base, pages); + + return dst; +} + /* * The SRAM context is lost during off-idle and stack * needs to be reset. @@ -75,6 +100,9 @@ void omap_sram_reset(void) void __init omap_map_sram(unsigned long start, unsigned long size, unsigned long skip, int cached) { + unsigned long base; + int pages; + if (size == 0) return; @@ -95,4 +123,10 @@ void __init omap_map_sram(unsigned long */ memset_io(omap_sram_base + omap_sram_skip, 0, omap_sram_size - omap_sram_skip); + + base = (unsigned long)omap_sram_base; + pages = PAGE_ALIGN(omap_sram_size) / PAGE_SIZE; + + set_memory_ro(base, pages); + set_memory_x(base, pages); }