Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-11 14:42:24 +00:00
Code Issues Packages Projects Releases Wiki Activity

powerpc: Rate-limit users spamming kernel log buffer

Browse Source 
The facility unavailable exception can be triggered from userspace by
accessing PMU registers when EBB is not enabled.  This causes the
included pr_err() to run, hence spamming the kernel log buffer.

This avoids this by rate limiting these messages.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2014-03-14 17:03:58 +11:00 committed by Benjamin Herrenschmidt
parent e9aaac1ac3
commit ee4ed6fa5a
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/powerpc/kernel/traps.c
View File

@ -1379,8 +1379,9 @@ void facility_unavailable_exception(struct pt_regs *regs)
if (!arch_irq_disabled_regs(regs)) if (!arch_irq_disabled_regs(regs))
local_irq_enable(); local_irq_enable();
pr_err("%sFacility '%s' unavailable, exception at 0x%lx, MSR=%lx\n", pr_err_ratelimited(
hv ? "Hypervisor " : "", facility, regs->nip, regs->msr); "%sFacility '%s' unavailable, exception at 0x%lx, MSR=%lx\n",
hv ? "Hypervisor " : "", facility, regs->nip, regs->msr);
if (user_mode(regs)) { if (user_mode(regs)) {
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip); _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);