For userspace to tell the difference between a random signal and an
exception, the exception must include siginfo information.
Using SEND_SIG_FORCED for SIGILL is thus wrong, and it will result
in userspace seeing si_code == SI_USER (like a random signal) instead
of si_code == SI_KERNEL or a more specific si_code as all exceptions
deliver.
Therefore replace force_sig_info(SIGILL, SEND_SIG_FORCE, current)
with force_sig(SIG_ILL, current) which gets this right and is
shorter and easier to type.
Fixes: 014940bad8e4 ("uprobes/x86: Send SIGILL if arch_uprobe_post_xol() fails")
Fixes: 0b5256c7f173 ("uprobes: Send SIGILL if handle_trampoline() fails")
Signed-off-by: "Eric W. Biederman" <[email protected]>
---
kernel/events/uprobes.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 3207a4d26849..2bf792d22087 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1858,7 +1858,7 @@ static void handle_trampoline(struct pt_regs *regs)
sigill:
uprobe_warn(current, "handle uretprobe, sending SIGILL.");
- force_sig_info(SIGILL, SEND_SIG_FORCED, current);
+ force_sig(SIGILL, current);
}
@@ -1966,7 +1966,7 @@ static void handle_singlestep(struct uprobe_task *utask,
struct pt_regs *regs)
if (unlikely(err)) {
uprobe_warn(current, "execute the probed insn, sending
SIGILL.");
- force_sig_info(SIGILL, SEND_SIG_FORCED, current);
+ force_sig(SIGILL, current);
}
}
--
2.17.1
