diff options
| author | Pratyush Anand <panand@redhat.com> | 2016-11-02 14:40:44 +0530 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-11-07 18:15:21 +0000 |
| commit | 53d07e21854de064d9625853b8303357482b25b1 (patch) | |
| tree | 36bfe1e2bfc3fe814b3f17762fb0d7856db36c5c /arch/arm64/kernel/debug-monitors.c | |
| parent | 3fb69640fed1dd4d8f5b81b2ee7ccaf82e369bf5 (diff) | |
| download | linux-53d07e21854de064d9625853b8303357482b25b1.tar.bz2 | |
arm64: Handle TRAP_BRKPT for user mode as well
uprobe is registered at break_hook with a unique ESR code. So, when a
TRAP_BRKPT occurs, call_break_hook checks if it was for uprobe. If not,
then send a SIGTRAP to user.
Signed-off-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/debug-monitors.c')
| -rw-r--r-- | arch/arm64/kernel/debug-monitors.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index a8f8de012250..605df76f0a06 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -306,16 +306,20 @@ NOKPROBE_SYMBOL(call_break_hook); static int brk_handler(unsigned long addr, unsigned int esr, struct pt_regs *regs) { - if (user_mode(regs)) { - send_user_sigtrap(TRAP_BRKPT); - } + bool handler_found = false; + #ifdef CONFIG_KPROBES - else if ((esr & BRK64_ESR_MASK) == BRK64_ESR_KPROBES) { - if (kprobe_breakpoint_handler(regs, esr) != DBG_HOOK_HANDLED) - return -EFAULT; + if ((esr & BRK64_ESR_MASK) == BRK64_ESR_KPROBES) { + if (kprobe_breakpoint_handler(regs, esr) == DBG_HOOK_HANDLED) + handler_found = true; } #endif - else if (call_break_hook(regs, esr) != DBG_HOOK_HANDLED) { + if (!handler_found && call_break_hook(regs, esr) == DBG_HOOK_HANDLED) + handler_found = true; + + if (!handler_found && user_mode(regs)) { + send_user_sigtrap(TRAP_BRKPT); + } else if (!handler_found) { pr_warn("Unexpected kernel BRK exception at EL1\n"); return -EFAULT; } |