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ARM: probes: avoid adding kprobes to sensitive kernel-entry/exit code

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Avoid adding kprobes to any of the kernel entry/exit or startup
assembly code, or code in the identity-mapped region.  This code does
not conform to the standard C conventions, which means that the
expectations of the kprobes code is not forfilled.

Placing kprobes at some of these locations results in the kernel trying
to return to userspace addresses while retaining the CPU in kernel mode.

Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King
2017-11-24 23:54:22 +00:00
parent 75fea300d7
commit c608906165
11 changed files with 47 additions and 45 deletions
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4
arch/arm/kernel/traps.c
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@@ -72,7 +72,7 @@ void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long
printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from);
#endif
if (in_exception_text(where))
if (in_entry_text(from))
dump_mem("", "Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
}
@@ -433,7 +433,7 @@ static int call_undef_hook(struct pt_regs *regs, unsigned int instr)
return fn ? fn(regs, instr) : 1;
}
asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
asmlinkage void do_undefinstr(struct pt_regs *regs)
{
unsigned int instr;
siginfo_t info;