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authorOmar Sandoval <osandov@osandov.com>2014-08-01 18:14:06 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-08-02 15:20:30 +0100
commit6bf755db4d5e7ccea61fb17727a183b9bd8945b1 (patch)
tree74ca99a04770e5ff8598bbf63e30a1d9025dc338
parentc5cc87fa8ddf971682fc5dd112e2dfacb11f30cd (diff)
downloadlinux-6bf755db4d5e7ccea61fb17727a183b9bd8945b1.tar.gz
ARM: 8124/1: don't enter kgdb when userspace executes a kgdb break instruction
The kgdb breakpoint hooks (kgdb_brk_fn and kgdb_compiled_brk_fn) should only be entered when a kgdb break instruction is executed from the kernel. Otherwise, if kgdb is enabled, a userspace program can cause the kernel to drop into the debugger by executing either KGDB_BREAKINST or KGDB_COMPILED_BREAK. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Omar Sandoval <osandov@osandov.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/kernel/kgdb.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
index 778c2f7024f..a74b53c1b7d 100644
--- a/arch/arm/kernel/kgdb.c
+++ b/arch/arm/kernel/kgdb.c
@@ -160,12 +160,16 @@ static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int instr)
static struct undef_hook kgdb_brkpt_hook = {
.instr_mask = 0xffffffff,
.instr_val = KGDB_BREAKINST,
+ .cpsr_mask = MODE_MASK,
+ .cpsr_val = SVC_MODE,
.fn = kgdb_brk_fn
};
static struct undef_hook kgdb_compiled_brkpt_hook = {
.instr_mask = 0xffffffff,
.instr_val = KGDB_COMPILED_BREAK,
+ .cpsr_mask = MODE_MASK,
+ .cpsr_val = SVC_MODE,
.fn = kgdb_compiled_brk_fn
};