Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 60/60] MIPS: Send SIGILL for BPOSGE32 in `__compute_return_epc_for_insn | Date | Tue, 25 Jul 2017 12:16:51 -0700 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Maciej W. Rozycki <macro@imgtec.com>
commit 7b82c1058ac1f8f8b9f2b8786b1f710a57a870a8 upstream.
Fix commit e50c0a8fa60d ("Support the MIPS32 / MIPS64 DSP ASE.") and send SIGILL rather than SIGBUS whenever an unimplemented BPOSGE32 DSP ASE instruction has been encountered in `__compute_return_epc_for_insn' as our Reserved Instruction exception handler would in response to an attempt to actually execute the instruction. Sending SIGBUS only makes sense for the unaligned PC case, since moved to `__compute_return_epc'. Adjust function documentation accordingly, correct formatting and use `pr_info' rather than `printk' as the other exit path already does.
Fixes: e50c0a8fa60d ("Support the MIPS32 / MIPS64 DSP ASE.") Signed-off-by: Maciej W. Rozycki <macro@imgtec.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Cc: stable@vger.kernel.org # 2.6.14+ Patchwork: https://patchwork.linux-mips.org/patch/16396/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/mips/kernel/branch.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/arch/mips/kernel/branch.c +++ b/arch/mips/kernel/branch.c @@ -396,7 +396,7 @@ int __MIPS16e_compute_return_epc(struct * * @regs: Pointer to pt_regs * @insn: branch instruction to decode - * @returns: -EFAULT on error and forces SIGBUS, and on success + * @returns: -EFAULT on error and forces SIGILL, and on success * returns 0 or BRANCH_LIKELY_TAKEN as appropriate after * evaluating the branch. */ @@ -633,8 +633,9 @@ int __compute_return_epc_for_insn(struct return ret; sigill: - printk("%s: DSP branch but not DSP ASE - sending SIGBUS.\n", current->comm); - force_sig(SIGBUS, current); + pr_info("%s: DSP branch but not DSP ASE - sending SIGILL.\n", + current->comm); + force_sig(SIGILL, current); return -EFAULT; } EXPORT_SYMBOL_GPL(__compute_return_epc_for_insn);
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