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Andreas Schwab 59c73a0acf m68k: Define asmlinkage_protect ... commit 8474ba7419 upstream. Make sure the compiler does not modify arguments of syscall functions. This can happen if the compiler generates a tailcall to another function. For example, without asmlinkage_protect sys_openat is compiled into this function: sys_openat: clr.l %d0 move.w 18(%sp),%d0 move.l %d0,16(%sp) jbra do_sys_open Note how the fourth argument is modified in place, modifying the register %d4 that gets restored from this stack slot when the function returns to user-space. The caller may expect the register to be unmodified across system calls. Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2015-10-22 14:43:25 -07:00
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asm	m68k: Define asmlinkage_protect	2015-10-22 14:43:25 -07:00
uapi/asm	m68k: Wire up execveat	2015-01-11 11:14:14 +01:00