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| author | Bobby Bingham <koorogi@koorogi.info> | 2014-04-03 14:46:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-03 16:20:52 -0700 |
| commit | a3c195144e162097c42e4284323ed6d386de105d (patch) | |
| tree | beae07ac4a12e2bee76f3160a8f4b5725f8a00ad /arch/sh/kernel | |
| parent | 7caf62de25554da3af00c92c11afa95dcc3592c4 (diff) | |
| download | linux-a3c195144e162097c42e4284323ed6d386de105d.tar.gz linux-a3c195144e162097c42e4284323ed6d386de105d.tar.bz2 linux-a3c195144e162097c42e4284323ed6d386de105d.zip | |
sh: don't pass saved userspace state to exception handlers
The compiler is permitted to generate code which overwrites the
parameters to a function. If those parameters include the only saved
copy we have of userspace's registers, we're in trouble.
Signed-off-by: Bobby Bingham <koorogi@koorogi.info>
Cc: Paul Mundt <paul.mundt@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sh/kernel')
| -rw-r--r-- | arch/sh/kernel/traps_32.c | 23 |
1 files changed, 7 insertions, 16 deletions
diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c index 68e99f09171d..ff639342a8be 100644 --- a/arch/sh/kernel/traps_32.c +++ b/arch/sh/kernel/traps_32.c @@ -594,9 +594,7 @@ int is_dsp_inst(struct pt_regs *regs) #endif /* CONFIG_SH_DSP */ #ifdef CONFIG_CPU_SH2A -asmlinkage void do_divide_error(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs __regs) +asmlinkage void do_divide_error(unsigned long r4) { siginfo_t info; @@ -613,11 +611,9 @@ asmlinkage void do_divide_error(unsigned long r4, unsigned long r5, } #endif -asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs __regs) +asmlinkage void do_reserved_inst(void) { - struct pt_regs *regs = RELOC_HIDE(&__regs, 0); + struct pt_regs *regs = current_pt_regs(); unsigned long error_code; struct task_struct *tsk = current; @@ -701,11 +697,9 @@ static int emulate_branch(unsigned short inst, struct pt_regs *regs) } #endif -asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs __regs) +asmlinkage void do_illegal_slot_inst(void) { - struct pt_regs *regs = RELOC_HIDE(&__regs, 0); + struct pt_regs *regs = current_pt_regs(); unsigned long inst; struct task_struct *tsk = current; @@ -730,15 +724,12 @@ asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5, die_if_no_fixup("illegal slot instruction", regs, inst); } -asmlinkage void do_exception_error(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs __regs) +asmlinkage void do_exception_error(void) { - struct pt_regs *regs = RELOC_HIDE(&__regs, 0); long ex; ex = lookup_exception_vector(); - die_if_kernel("exception", regs, ex); + die_if_kernel("exception", current_pt_regs(), ex); } void per_cpu_trap_init(void) |