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| author |   Andy Lutomirski <luto@kernel.org> | 2015-07-23 15:37:48 -0700 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2018-03-23 21:10:36 +0100 |
| commit | d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9 (patch) | |
| tree | fa7b9596ae52c9d63e25a151aff370a468192f68 /arch/x86/kernel/idt.c | |
| parent | x86/efi: Free efi_pgd with free_pages() (diff) | |
| download | linux-dev-d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9.tar.xz linux-dev-d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9.zip | |
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.c | 2 |
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), |