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The ia64 handling of failure to setup a signal frame has been trying to set overlapping fields in struct siginfo since 2.3.43. The si_pid and si_uid fields are stomped when the si_addr field is set. The si_code of SI_KERNEL indicates that si_pid and si_uid should be valid, and that si_addr does not exist. Being at odds with the definition of SI_KERNEL and with nothing to indicate that this was a signal frame setup failure there is no way for userspace to know that si_addr was filled out instead. In practice failure to setup a signal frame is rare, and si_pid and si_uid are always set to 0 when si_code is SI_KERNEL so I expect no one has looked closely enough before to see this weirdness. Further the only difference between force_sigsegv_info and the generic force_sigsegv other than the return code is that force_sigsegv_info stomps the si_uid and si_pid fields. Remove the bug and simplify the code by using force_sigsegv in this case just like other architectures. Fixes: 2.3.43 Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: linux-ia64@vger.kernel.org Acked-by: Tony Luck <tony.luck@intel.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> |
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