path: root/arch/unicore32/kernel/fpu-ucf64.c
diff options
authorEric W. Biederman <ebiederm@xmission.com>2018-04-19 17:07:27 -0500
committerEric W. Biederman <ebiederm@xmission.com>2018-04-25 10:40:56 -0500
commitd8f7f3228a4b88d238d6a749e9a31eef37b270ea (patch)
tree65142c93ef21e97a23ff8281f261f68cf07d2e5e /arch/unicore32/kernel/fpu-ucf64.c
parentsignal/powerpc: Replace FPE_FIXME with FPE_FLTUNK (diff)
signal/unicore32: Use FPE_FLTUNK instead of 0 in ucf64_raise_sigfpe
The si_code of 0 (aka SI_USER) has fields si_pid and si_uid not si_addr so it so only by luck would the appropriate fields by copied to userspace by copy_siginfo_to_user. This is just broken and wrong. Make it obvious what is happening by moving the si_code from a parameter of the one call to ucf64_raise_sigfpe to a constant value that info.si_code gets set to. Explicitly set the si_code to FPE_FLTUNK the newly reserved floating point si_code for an unknown floating point exception. It looks like there is a fair chance that this is a code path that has never been used in real life on unicore32. The bad si_code and the print statement that calls it an unhandled exception. So I really don't expect anyone will mind if this just gets fixed. In similar situations on more popular architectures the conclusion was just fix it. Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Arnd Bergmann <arnd@arndb.de> Fixes: d9bc15794d12 ("unicore32 additional architecture files: float point handling") Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to '')
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/unicore32/kernel/fpu-ucf64.c b/arch/unicore32/kernel/fpu-ucf64.c
index d785955e1c29..8594b168f25e 100644
--- a/arch/unicore32/kernel/fpu-ucf64.c
+++ b/arch/unicore32/kernel/fpu-ucf64.c
@@ -52,14 +52,14 @@
* Raise a SIGFPE for the current process.
* sicode describes the signal being raised.
-void ucf64_raise_sigfpe(unsigned int sicode, struct pt_regs *regs)
+void ucf64_raise_sigfpe(struct pt_regs *regs)
siginfo_t info;
info.si_signo = SIGFPE;
- info.si_code = sicode;
+ info.si_code = FPE_FLTUNK;
info.si_addr = (void __user *)(instruction_pointer(regs) - 4);
@@ -94,7 +94,7 @@ void ucf64_exchandler(u32 inst, u32 fpexc, struct pt_regs *regs)
pr_debug("UniCore-F64 FPSCR 0x%08x INST 0x%08x\n",
cff(FPSCR), inst);
- ucf64_raise_sigfpe(0, regs);
+ ucf64_raise_sigfpe(regs);