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authorEric W. Biederman <ebiederm@xmission.com>2018-04-16 13:55:53 -0500
committerEric W. Biederman <ebiederm@xmission.com>2018-09-27 21:58:04 +0200
commitb92adb74adde62d9a9780ff2977d63dcb21aeaa6 (patch)
treec7eee18a7b093092223997b45368d334a80c42f6 /arch/ia64
parentsignal/ia64: Use the generic force_sigsegv in setup_frame (diff)
downloadlinux-dev-b92adb74adde62d9a9780ff2977d63dcb21aeaa6.tar.xz
linux-dev-b92adb74adde62d9a9780ff2977d63dcb21aeaa6.zip
signal/ia64: Use the force_sig(SIGSEGV,...) in ia64_rt_sigreturn
The ia64 handling of failure to return from a signal frame has been trying to set overlapping fields in struct siginfo since 2.3.43. The si_code corresponds to the fields that were stomped (not the field that is actually written), so I can not imagine a piece of userspace code making sense of the signal frame if it looks closely. In practice failure to return from a signal frame is a rare event that almost never happens. Someone using an alternate signal stack to recover and looking in detail is even more rare. So I presume no one has ever noticed and reported this ia64 nonsense. Sort this out by causing ia64 to use force_sig(SIGSEGV) 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>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/signal.c10
1 files changed, 1 insertions, 9 deletions
diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index 01fc133b2e4c..9a960829a01d 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -110,7 +110,6 @@ ia64_rt_sigreturn (struct sigscratch *scr)
{
extern char ia64_strace_leave_kernel, ia64_leave_kernel;
struct sigcontext __user *sc;
- struct siginfo si;
sigset_t set;
long retval;
@@ -153,14 +152,7 @@ ia64_rt_sigreturn (struct sigscratch *scr)
return retval;
give_sigsegv:
- clear_siginfo(&si);
- si.si_signo = SIGSEGV;
- si.si_errno = 0;
- si.si_code = SI_KERNEL;
- si.si_pid = task_pid_vnr(current);
- si.si_uid = from_kuid_munged(current_user_ns(), current_uid());
- si.si_addr = sc;
- force_sig_info(SIGSEGV, &si, current);
+ force_sig(SIGSEGV, current);
return retval;
}