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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-07-23 00:00:00 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-07-24 15:04:57 +0200 |
| commit | 8d5ea35c5e9139dbd19a3d73985d008d36c9968f (patch) | |
| tree | c37a3e2b024d6b85e0e1475a55bdc2608e1d6d82 /arch/x86/entry/common.c | |
| parent | Merge branch 'core/entry' into x86/entry (diff) | |
| download | linux-8d5ea35c5e9139dbd19a3d73985d008d36c9968f.tar.xz linux-8d5ea35c5e9139dbd19a3d73985d008d36c9968f.zip | |
x86/entry: Consolidate check_user_regs()
The user register sanity check is sprinkled all over the place. Move it
into enter_from_user_mode().
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20200722220519.943016204@linutronix.de
Diffstat (limited to 'arch/x86/entry/common.c')
| -rw-r--r-- | arch/x86/entry/common.c | 24 |
1 files changed, 9 insertions, 15 deletions
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 4eae4c1f254d..ab6cb8602c0b 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -82,10 +82,11 @@ static noinstr void check_user_regs(struct pt_regs *regs) * 2) Invoke context tracking if enabled to reactivate RCU * 3) Trace interrupts off state */ -static noinstr void enter_from_user_mode(void) +static noinstr void enter_from_user_mode(struct pt_regs *regs) { enum ctx_state state = ct_state(); + check_user_regs(regs); lockdep_hardirqs_off(CALLER_ADDR0); user_exit_irqoff(); @@ -95,8 +96,9 @@ static noinstr void enter_from_user_mode(void) instrumentation_end(); } #else -static __always_inline void enter_from_user_mode(void) +static __always_inline void enter_from_user_mode(struct pt_regs *regs) { + check_user_regs(regs); lockdep_hardirqs_off(CALLER_ADDR0); instrumentation_begin(); trace_hardirqs_off_finish(); @@ -369,9 +371,7 @@ __visible noinstr void do_syscall_64(unsigned long nr, struct pt_regs *regs) { struct thread_info *ti; - check_user_regs(regs); - - enter_from_user_mode(); + enter_from_user_mode(regs); instrumentation_begin(); local_irq_enable(); @@ -434,9 +434,7 @@ static void do_syscall_32_irqs_on(struct pt_regs *regs) /* Handles int $0x80 */ __visible noinstr void do_int80_syscall_32(struct pt_regs *regs) { - check_user_regs(regs); - - enter_from_user_mode(); + enter_from_user_mode(regs); instrumentation_begin(); local_irq_enable(); @@ -487,8 +485,6 @@ __visible noinstr long do_fast_syscall_32(struct pt_regs *regs) vdso_image_32.sym_int80_landing_pad; bool success; - check_user_regs(regs); - /* * SYSENTER loses EIP, and even SYSCALL32 needs us to skip forward * so that 'regs->ip -= 2' lands back on an int $0x80 instruction. @@ -496,7 +492,7 @@ __visible noinstr long do_fast_syscall_32(struct pt_regs *regs) */ regs->ip = landing_pad; - enter_from_user_mode(); + enter_from_user_mode(regs); instrumentation_begin(); local_irq_enable(); @@ -599,8 +595,7 @@ idtentry_state_t noinstr idtentry_enter(struct pt_regs *regs) }; if (user_mode(regs)) { - check_user_regs(regs); - enter_from_user_mode(); + enter_from_user_mode(regs); return ret; } @@ -733,8 +728,7 @@ void noinstr idtentry_exit(struct pt_regs *regs, idtentry_state_t state) */ void noinstr idtentry_enter_user(struct pt_regs *regs) { - check_user_regs(regs); - enter_from_user_mode(); + enter_from_user_mode(regs); } /** |