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Bottomley" , Helge Deller Cc: kernel-hardening@lists.openwall.com, linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, Oscar Carter Subject: [PATCH v2] parisc/kernel/ftrace: Remove function callback casts Date: Sat, 4 Jul 2020 17:50:57 +0200 Message-Id: <20200704155057.3959-1-oscar.carter@gmx.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:R5hfiGVWqGDQ+lgUWVBXTSSU4VXpztSPSCW5LLJmeHirtrL6qjS h/OkEOlAmkQWjNgwbAmZBSa18vPP+iqfKLX1U55rOelFaBbimJgHUQ++ryBIxErjaluqiMt RIzTxmbduIX0Te4N5eAl07WmZfV7y8e3KkR/b3vie7Da24pcW5tpc54brxK6iJQd4j0bTmC oYpkkQ5YWFw1jesnCFPEw== X-UI-Out-Filterresults: notjunk:1;V03:K0:KPr6d6wU2Tk=:/XQpyyxWJW59BDAc3HhAH3 IXHbCmVEp97xXSOOgw3mmkjjdvuOjilAakJ42ogmcW37xhPjuG+LBkIujb/40lbDwhI2sKR3o nw2ExcoF2Gfyu1RBajF8GQ9IYcl9gGYABYcHhsjwnYmijWCqvnXsikMaQ1VKSoLZoNx/bu+0F 2CfJLJuMYfg1RisPaW4sJev9yiH0lPeRenDfWG6FC0nIUm2YVMuQd9gJkv3v1Q8L6jeQ2XFzc i5ecrrKCczi+Eekugon/tn200O31pD5v05hvJHXCqNch5DskoOlFNMXA1gtLfoL4oNkCBk84P 95XHMl7bQuoFOLPDFzyPKWlvjRNhcRYAA4aNJx/UnRWPxms5sWppXqL2x+XrXZjnqDpv6Qb0m Hxah4Nysds2rJy04IjB3qQxXBTYMZ0vQuXsjH1DtB64/ANF9Fmhc5ZBp3iGVdL5Ce5taP+0z1 68wHrNOfK9htjl+G4ZFl2fY0qh0PhCBOI1f/sk61sEJsp0rTPTzD1q3CzvymtjwFYorT9ubgk 8iJAe6uOWEIAv1zg2/aorozWcGRGyGpgrZWpubv6OAOay9FZo/HkrwjQ7V0u4R9iRh0fmzWKG BeFKtNXjXeXXgaBXlrrysojX8CfzL8ZKxtUVyhdsZGhwV3qOiKaJ37Wb/YOX5t67DPsJrFC/o EXUA8fhlkNR4GpcgOhmgRS0dJTV7CyvOyrCFSYJgKxPOiRP5fcxq1+j2S6mlLTqiQap5ekY6e 0uZs1XR3k4eMrLdxcTX6kcW22uj00lmKibRTiUIFp60Z1C5ppaM905kN7nRHUR93MYcmLik6a oHubOPv7Fslx49tL+K0EzCuoWpfxSCu2go5L4ZujE9WgmmcSW0n6t1iq/eJlfdlROcVZ5S3Ok wnQVb8V0cyFpjcQOFUgLLChyowo7x3lTATF5jtMIYYtDKliZMh2n2LFVXpLoB8LxL7MwPJRg1 +j1HEHL43UUeox/AocpLz29sVHEfLZc9/8dRDDrCK598eDdcaJBxi0b1QaeN3A+fhTBgQB04B XTOK3vljJGNbTxfl9KkqXfecWjdJI8UHy1dRiYRppNb9lLAl5ogm1xZzroDF7A2MyG40WFtGK VYmOFabofs9uEkQZZF8A0A7mmVbYyDRlCZ+wWbEEZeOrmC2Ikt22MYMhE9PaIFca/CbQqaD4s KprKJSzGlLU8Bt+fqqZwUpqd5pgYHicIJiLEDIfoNKojbL53ODavYRlZ5SZg55XXdaTlBLkXw bsFBe4bDUCsu/sDF+zwCgueVfXEs9SF69YsjqCw== In an effort to enable -Wcast-function-type in the top-level Makefile to support Control Flow Integrity builds, remove all the function callback casts. To do this add an inline function helper to get the address of a function. This helper uses the "dereference_function_descriptor" as the parisc64 architecture uses function descriptors instead of direct addresses for functions. Then, remove the cast to a function pointer type in the comparison statement and use the function helper to get the address of every function in the right and left operand. This can be done since the comparison is against function address (these operands are not function calls). Co-developed-by: Helge Deller Signed-off-by: Helge Deller Signed-off-by: Oscar Carter =2D-- Hi, I have added the Co-develop-by tag and Signed-off-by tag to give credit to Helge Deller if there are no objections. Thanks. Changelog v1->v2 - Use the function "dereference_function_descriptor" to get the function address instead of a direct cast to unsigned long type. - Modify the commit changelog accordingly. - Add the Co-developed-by tag and Signed-off-by tag to give credit to Helg= e Deller. arch/parisc/kernel/ftrace.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c index 1df0f67ed667..c53576890881 100644 =2D-- a/arch/parisc/kernel/ftrace.c +++ b/arch/parisc/kernel/ftrace.c @@ -24,6 +24,11 @@ #define __hot __attribute__ ((__section__ (".text.hot"))) #ifdef CONFIG_FUNCTION_GRAPH_TRACER +static inline unsigned long ftrace_get_function_address(void *function) +{ + return (unsigned long)dereference_function_descriptor(function); +} + /* * Hook the return address and push it in the stack of return addrs * in current thread info. @@ -64,7 +69,8 @@ void notrace __hot ftrace_function_trampoline(unsigned l= ong parent, function_trace_op, regs); #ifdef CONFIG_FUNCTION_GRAPH_TRACER - if (ftrace_graph_return !=3D (trace_func_graph_ret_t) ftrace_stub || + if (ftrace_get_function_address(ftrace_graph_return) !=3D + ftrace_get_function_address(ftrace_stub) || ftrace_graph_entry !=3D ftrace_graph_entry_stub) { unsigned long *parent_rp; =2D- 2.20.1