user/sven/linux.git/kernel/extable.c, branch v4.9.243

kernel/extable.c: mark core_kernel_text notrace

2017-07-21T05:42:21Z

commit c0d80ddab89916273cb97114889d3f337bc370ae upstream. core_kernel_text is used by MIPS in its function graph trace processing, so having this method traced leads to an infinite set of recursive calls such as: Call Trace: ftrace_return_to_handler+0x50/0x128 core_kernel_text+0x10/0x1b8 prepare_ftrace_return+0x6c/0x114 ftrace_graph_caller+0x20/0x44 return_to_handler+0x10/0x30 return_to_handler+0x0/0x30 return_to_handler+0x0/0x30 ftrace_ops_no_ops+0x114/0x1bc core_kernel_text+0x10/0x1b8 core_kernel_text+0x10/0x1b8 core_kernel_text+0x10/0x1b8 ftrace_ops_no_ops+0x114/0x1bc core_kernel_text+0x10/0x1b8 prepare_ftrace_return+0x6c/0x114 ftrace_graph_caller+0x20/0x44 (...) Mark the function notrace to avoid it being traced. Link: http://lkml.kernel.org/r/1498028607-6765-1-git-send-email-marcin.nowakowski@imgtec.com Signed-off-by: Marcin Nowakowski Reviewed-by: Masami Hiramatsu Cc: Peter Zijlstra Cc: Thomas Meyer Cc: Ingo Molnar Cc: Steven Rostedt Cc: Daniel Borkmann Cc: Paul Gortmaker Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

kernel/extable.c: remove duplicated include

2015-09-10T20:29:01Z

Signed-off-by: Wei Yongjun Acked-by: Steven Rostedt Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ftrace/x86/extable: Add is_ftrace_trampoline() function

2014-11-19T20:25:26Z

Stack traces that happen from function tracing check if the address on the stack is a __kernel_text_address(). That is, is the address kernel code. This calls core_kernel_text() which returns true if the address is part of the builtin kernel code. It also calls is_module_text_address() which returns true if the address belongs to module code. But what is missing is ftrace dynamically allocated trampolines. These trampolines are allocated for individual ftrace_ops that call the ftrace_ops callback functions directly. But if they do a stack trace, the code checking the stack wont detect them as they are neither core kernel code nor module address space. Adding another field to ftrace_ops that also stores the size of the trampoline assigned to it we can create a new function called is_ftrace_trampoline() that returns true if the address is a dynamically allocate ftrace trampoline. Note, it ignores trampolines that are not dynamically allocated as they will return true with the core_kernel_text() function. Link: http://lkml.kernel.org/r/20141119034829.497125839@goodmis.org Cc: Ingo Molnar Cc: "H. Peter Anvin" Acked-by: Thomas Gleixner Signed-off-by: Steven Rostedt

asmlinkage: Make main_extable_sort_needed visible

2014-02-14T02:13:22Z

main_extable_sort_needed is used by the build system and needs to be a normal ELF symbol. Make it visible so that LTO does not remove or mangle it. Signed-off-by: Andi Kleen Link: http://lkml.kernel.org/r/1391845930-28580-8-git-send-email-ak@linux.intel.com Signed-off-by: H. Peter Anvin

kernel/extable: fix address-checks for core_kernel and init areas

2013-11-28T17:49:41Z

The init_kernel_text() and core_kernel_text() functions should not include the labels _einittext and _etext when checking if an address is inside the .text or .init sections. Signed-off-by: Helge Deller Signed-off-by: Linus Torvalds

extable: skip sorting if the table is empty

2013-09-11T22:58:25Z

At least on ARM no-MMU the extable is empty and so there is nothing to sort. So add a check for the table to be empty which effectively only changes that the misleading pr_notice is suppressed. Signed-off-by: Uwe Kleine-König Cc: Ingo Molnar Cc: David Daney Cc: "H. Peter Anvin" Cc: Borislav Petkov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

extable: Flip the sorting message

2013-04-15T11:25:16Z

Now that we do sort the __extable at build time, we actually are interested only in the case where we still do need to sort it. Signed-off-by: Borislav Petkov Cc: David Daney Link: http://lkml.kernel.org/r/1366023109-12098-1-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar

extable: Skip sorting if sorted at build time.

2012-04-19T22:06:55Z

If the build program sortextable has already sorted the exception table, don't sort it again. Signed-off-by: David Daney Link: http://lkml.kernel.org/r/1334872799-14589-3-git-send-email-ddaney.cavm@gmail.com Signed-off-by: H. Peter Anvin

extable, core_kernel_data(): Make sure all archs define _sdata

2011-05-20T06:56:56Z

A new utility function (core_kernel_data()) is used to determine if a passed in address is part of core kernel data or not. It may or may not return true for RO data, but this utility must work for RW data. Thus both _sdata and _edata must be defined and continuous, without .init sections that may later be freed and replaced by volatile memory (memory that can be freed). This utility function is used to determine if data is safe from ever being freed. Thus it should return true for all RW global data that is not in a module or has been allocated, or false otherwise. Also change core_kernel_data() back to the more precise _sdata condition and document the function. Signed-off-by: Steven Rostedt Acked-by: Ralf Baechle Acked-by: Hirokazu Takata Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Cc: Geert Uytterhoeven Cc: Roman Zippel Cc: linux-m68k@lists.linux-m68k.org Cc: Kyle McMartin Cc: Helge Deller Cc: JamesE.J.Bottomley Link: http://lkml.kernel.org/r/1305855298.1465.19.camel@gandalf.stny.rr.com Signed-off-by: Ingo Molnar ---- arch/alpha/kernel/vmlinux.lds.S | 1 + arch/m32r/kernel/vmlinux.lds.S | 1 + arch/m68k/kernel/vmlinux-std.lds | 2 ++ arch/m68k/kernel/vmlinux-sun3.lds | 1 + arch/mips/kernel/vmlinux.lds.S | 1 + arch/parisc/kernel/vmlinux.lds.S | 3 +++ kernel/extable.c | 12 +++++++++++- 7 files changed, 20 insertions(+), 1 deletion(-)

core_kernel_data(): Fix architectures that do not define _sdata

2011-05-19T23:27:16Z

Some architectures such as Alpha do not define _sdata but _data: kernel/built-in.o: In function `core_kernel_data': kernel/extable.c:77: undefined reference to `_sdata' So expand the scope of the data range to the text addresses too, this might be more correct anyway because this way we can cover readonly variables as well. Cc: Paul E. McKenney Cc: Steven Rostedt Link: http://lkml.kernel.org/n/tip-i878c8a0e0g0ep4v7i6vxnhz@git.kernel.org Signed-off-by: Ingo Molnar