mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-17 09:43:59 +08:00
signal/m68k: Use force_sigsegv(SIGSEGV) in fpsp040_die
In the fpsp040 code when copyin or copyout fails call force_sigsegv(SIGSEGV) instead of do_exit(SIGSEGV). This solves a couple of problems. Because do_exit embeds the ptrace stop PTRACE_EVENT_EXIT a complete stack frame needs to be present for that to work correctly. There is always the information needed for a ptrace stop where get_signal is called. So exiting with a signal solves the ptrace issue. Further exiting with a signal ensures that all of the threads in a process are killed not just the thread that malfunctioned. Which avoids confusing userspace. To make force_sigsegv(SIGSEGV) work in fpsp040_die modify the code to save all of the registers and jump to ret_from_exception (which ultimately calls get_signal) after fpsp040_die returns. v2: Updated the branches to use gas's pseudo ops that automatically calculate the best branch instruction to use for the purpose. v1: https://lkml.kernel.org/r/87a6m8kgtx.fsf_-_@disp2133 Link: https://lkml.kernel.org/r/87tukghjfs.fsf_-_@disp2133 Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
parent
b48c7236b1
commit
a3616a3c02
@ -502,7 +502,8 @@ in_ea:
|
||||
.section .fixup,#alloc,#execinstr
|
||||
.even
|
||||
1:
|
||||
jbra fpsp040_die
|
||||
jbsr fpsp040_die
|
||||
jbra .Lnotkern
|
||||
|
||||
.section __ex_table,#alloc
|
||||
.align 4
|
||||
|
@ -1150,7 +1150,7 @@ asmlinkage void set_esp0(unsigned long ssp)
|
||||
*/
|
||||
asmlinkage void fpsp040_die(void)
|
||||
{
|
||||
do_exit(SIGSEGV);
|
||||
force_sigsegv(SIGSEGV);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_M68KFPU_EMU
|
||||
|
Loading…
Reference in New Issue
Block a user