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authorAndy Lutomirski <luto@kernel.org>2015-07-23 15:37:48 -0700
committerThomas Gleixner <tglx@linutronix.de>2018-03-23 21:10:36 +0100
commitd8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9 (patch)
treefa7b9596ae52c9d63e25a151aff370a468192f68 /arch/x86/kernel/idt.c
parent06ace26f4e6fcf747e890a39193be811777a048a (diff)
downloadlinux-d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9.tar.bz2
x86/entry/64: Don't use IST entry for #BP stack
There's nothing IST-worthy about #BP/int3. We don't allow kprobes in the small handful of places in the kernel that run at CPL0 with an invalid stack, and 32-bit kernels have used normal interrupt gates for #BP forever. Furthermore, we don't allow kprobes in places that have usergs while in kernel mode, so "paranoid" is also unnecessary. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org
Diffstat (limited to 'arch/x86/kernel/idt.c')
-rw-r--r--arch/x86/kernel/idt.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index 56d99be3706a..50bee5fe1140 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -160,7 +160,6 @@ static const __initconst struct idt_data early_pf_idts[] = {
*/
static const __initconst struct idt_data dbg_idts[] = {
INTG(X86_TRAP_DB, debug),
- INTG(X86_TRAP_BP, int3),
};
#endif
@@ -183,7 +182,6 @@ gate_desc debug_idt_table[IDT_ENTRIES] __page_aligned_bss;
static const __initconst struct idt_data ist_idts[] = {
ISTG(X86_TRAP_DB, debug, DEBUG_STACK),
ISTG(X86_TRAP_NMI, nmi, NMI_STACK),
- SISTG(X86_TRAP_BP, int3, DEBUG_STACK),
ISTG(X86_TRAP_DF, double_fault, DOUBLEFAULT_STACK),
#ifdef CONFIG_X86_MCE
ISTG(X86_TRAP_MC, &machine_check, MCE_STACK),