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powerpc/signal: Refactor bad frame logging 

The logging of bad frame appears half a dozen of times
and is pretty similar.

Create signal_fault() fonction to perform that logging.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/fa094445c119fc00315e1c13783b493346306c6a.1597770847.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-08-18 17:19:23 +00:00 committed by Michael Ellerman
parent c180cb305c
commit 7fe8f773ee
4 changed files with 21 additions and 43 deletions
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11
arch/powerpc/kernel/signal.c
View File

@ -351,3 +351,14 @@ static unsigned long get_tm_stackpointer(struct task_struct *tsk)
#endif
return ret;
}
static const char fm32[] = KERN_INFO "%s[%d]: bad frame in %s: %p nip %08lx lr %08lx\n";
static const char fm64[] = KERN_INFO "%s[%d]: bad frame in %s: %p nip %016lx lr %016lx\n";
void signal_fault(struct task_struct *tsk, struct pt_regs *regs,
const char *where, void __user *ptr)
{
if (show_unhandled_signals)
printk_ratelimited(regs->msr & MSR_64BIT ? fm64 : fm32, tsk->comm,
task_pid_nr(tsk), where, ptr, regs->nip, regs->link);
}

3
arch/powerpc/kernel/signal.h
View File

@ -93,4 +93,7 @@ static inline int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
#endif /* !defined(CONFIG_PPC64) */
void signal_fault(struct task_struct *tsk, struct pt_regs *regs,
const char *where, void __user *ptr);
#endif /* _POWERPC_ARCH_SIGNAL_H */

35
arch/powerpc/kernel/signal_32.c
View File

@ -835,12 +835,7 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
return 0;
badframe:
if (show_unhandled_signals)
printk_ratelimited(KERN_INFO
"%s[%d]: bad frame in handle_rt_signal32: "
"%p nip %08lx lr %08lx\n",
tsk->comm, tsk->pid,
addr, regs->nip, regs->link);
signal_fault(tsk, regs, "handle_rt_signal32", addr);
return 1;
}
@ -1092,12 +1087,7 @@ SYSCALL_DEFINE0(rt_sigreturn)
return 0;
bad:
if (show_unhandled_signals)
printk_ratelimited(KERN_INFO
"%s[%d]: bad frame in sys_rt_sigreturn: "
"%p nip %08lx lr %08lx\n",
current->comm, current->pid,
rt_sf, regs->nip, regs->link);
signal_fault(current, regs, "sys_rt_sigreturn", rt_sf);
force_sig(SIGSEGV);
return 0;
@ -1181,12 +1171,7 @@ SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx,
* We kill the task with a SIGSEGV in this situation.
*/
if (do_setcontext(ctx, regs, 1)) {
if (show_unhandled_signals)
printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
"sys_debug_setcontext: %p nip %08lx "
"lr %08lx\n",
current->comm, current->pid,
ctx, regs->nip, regs->link);
signal_fault(current, regs, "sys_debug_setcontext", ctx);
force_sig(SIGSEGV);
goto out;
@ -1287,12 +1272,7 @@ int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
return 0;
badframe:
if (show_unhandled_signals)
printk_ratelimited(KERN_INFO
"%s[%d]: bad frame in handle_signal32: "
"%p nip %08lx lr %08lx\n",
tsk->comm, tsk->pid,
frame, regs->nip, regs->link);
signal_fault(tsk, regs, "handle_signal32", frame);
return 1;
}
@ -1363,12 +1343,7 @@ SYSCALL_DEFINE0(sigreturn)
return 0;
badframe:
if (show_unhandled_signals)
printk_ratelimited(KERN_INFO
"%s[%d]: bad frame in sys_sigreturn: "
"%p nip %08lx lr %08lx\n",
current->comm, current->pid,
addr, regs->nip, regs->link);
signal_fault(current, regs, "sys_sigreturn", addr);
force_sig(SIGSEGV);
return 0;

15
arch/powerpc/kernel/signal_64.c
View File

@ -66,11 +66,6 @@ struct rt_sigframe {
char abigap[USER_REDZONE_SIZE];
} __attribute__ ((aligned (16)));
static const char fmt32[] = KERN_INFO \
"%s[%d]: bad frame in %s: %08lx nip %08lx lr %08lx\n";
static const char fmt64[] = KERN_INFO \
"%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n";
/*
* This computes a quad word aligned pointer inside the vmx_reserve array
* element. For historical reasons sigcontext might not be quad word aligned,
@ -801,10 +796,7 @@ SYSCALL_DEFINE0(rt_sigreturn)
return 0;
badframe:
if (show_unhandled_signals)
printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
current->comm, current->pid, "rt_sigreturn",
(long)uc, regs->nip, regs->link);
signal_fault(current, regs, "rt_sigreturn", uc);
force_sig(SIGSEGV);
return 0;
@ -911,10 +903,7 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
return 0;
badframe:
if (show_unhandled_signals)
printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
tsk->comm, tsk->pid, "setup_rt_frame",
(long)frame, regs->nip, regs->link);
signal_fault(current, regs, "handle_rt_signal64", frame);
return 1;
}