From: Yury Norov ynorov@caviumnetworks.com
maillist inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I7WGZU CVE: NA
Reference: https://github.com/norov/linux/commits/ilp32-5.2
--------------------------------
Based on patch of Andrew Pinski.
This patch introduces is_a32_compat_task and is_a32_thread so it is easier to say this is a a32 specific thread or a generic compat thread/task. Corresponding functions are located in <asm/is_compat.h> to avoid mess in headers.
Some files include both <linux/compat.h> and <asm/compat.h>, and this is wrong because <linux/compat.h> has <asm/compat.h> already included. It was fixed too.
Signed-off-by: Yury Norov ynorov@caviumnetworks.com Signed-off-by: Andrew Pinski Andrew.Pinski@caviumnetworks.com Signed-off-by: Bamvor Jian Zhang bamv2005@gmail.com Signed-off-by: Yury Norov ynorov@marvell.com Signed-off-by: Xiongfeng Wang wangxiongfeng2@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com
Conflicts: arch/arm64/include/asm/compat.h arch/arm64/include/asm/thread_info.h arch/arm64/kernel/process.c arch/arm64/kernel/ptrace.c arch/arm64/kernel/traps.c
Signed-off-by: Chen Jiahao chenjiahao16@huawei.com --- arch/arm64/include/asm/compat.h | 18 +--------- arch/arm64/include/asm/elf.h | 10 +++--- arch/arm64/include/asm/ftrace.h | 2 +- arch/arm64/include/asm/is_compat.h | 52 ++++++++++++++++++++++++++++ arch/arm64/include/asm/processor.h | 11 +++--- arch/arm64/include/asm/syscall.h | 2 +- arch/arm64/include/asm/thread_info.h | 2 +- arch/arm64/kernel/hw_breakpoint.c | 8 ++--- arch/arm64/kernel/perf_regs.c | 2 +- arch/arm64/kernel/process.c | 7 ++-- arch/arm64/kernel/ptrace.c | 11 +++--- arch/arm64/kernel/signal.c | 4 +-- arch/arm64/kernel/syscall.c | 2 +- arch/arm64/kernel/traps.c | 1 + 14 files changed, 84 insertions(+), 48 deletions(-) create mode 100644 arch/arm64/include/asm/is_compat.h
diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h index 74575c3d6987..aa45e46afad4 100644 --- a/arch/arm64/include/asm/compat.h +++ b/arch/arm64/include/asm/compat.h @@ -27,6 +27,7 @@ typedef u16 compat_ipc_pid_t; #include <linux/types.h> #include <linux/sched.h> #include <linux/sched/task_stack.h> +#include <asm/is_compat.h>
#ifdef __AARCH64EB__ #define COMPAT_UTS_MACHINE "armv8b\0\0" @@ -86,22 +87,5 @@ struct compat_statfs { #define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current))) #define COMPAT_MINSIGSTKSZ 2048
-static inline int is_compat_task(void) -{ - return test_thread_flag(TIF_32BIT); -} - -static inline int is_compat_thread(struct thread_info *thread) -{ - return test_ti_thread_flag(thread, TIF_32BIT); -} - -#else /* !CONFIG_COMPAT */ - -static inline int is_compat_thread(struct thread_info *thread) -{ - return 0; -} - #endif /* CONFIG_COMPAT */ #endif /* __ASM_COMPAT_H */ diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h index 97932fbf973d..8119fab9bffb 100644 --- a/arch/arm64/include/asm/elf.h +++ b/arch/arm64/include/asm/elf.h @@ -5,6 +5,10 @@ #ifndef __ASM_ELF_H #define __ASM_ELF_H
+#ifndef __ASSEMBLY__ +#include <linux/compat.h> +#endif + #include <asm/hwcap.h>
/* @@ -187,13 +191,9 @@ extern int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp);
/* 1GB of VA */ -#ifdef CONFIG_COMPAT -#define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \ +#define STACK_RND_MASK (is_compat_task() ? \ 0x7ff >> (PAGE_SHIFT - 12) : \ 0x3ffff >> (PAGE_SHIFT - 12)) -#else -#define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12)) -#endif
#ifdef __AARCH64EB__ #define COMPAT_ELF_PLATFORM ("v8b") diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h index b87d70b693c6..9e94da445031 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -175,7 +175,7 @@ static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) { - return is_compat_task(); + return is_a32_compat_task(); }
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME diff --git a/arch/arm64/include/asm/is_compat.h b/arch/arm64/include/asm/is_compat.h new file mode 100644 index 000000000000..d8534d9ec1d0 --- /dev/null +++ b/arch/arm64/include/asm/is_compat.h @@ -0,0 +1,52 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __ASM_IS_COMPAT_H +#define __ASM_IS_COMPAT_H +#ifndef __ASSEMBLY__ + +#include <linux/thread_bits.h> + +#ifdef CONFIG_AARCH32_EL0 + +static inline int is_a32_compat_task(void) +{ + return test_thread_flag(TIF_32BIT); +} + +static inline int is_a32_compat_thread(struct thread_info *thread) +{ + return test_ti_thread_flag(thread, TIF_32BIT); +} + +#else + +static inline int is_a32_compat_task(void) + +{ + return 0; +} + +static inline int is_a32_compat_thread(struct thread_info *thread) +{ + return 0; +} + +#endif /* CONFIG_AARCH32_EL0 */ + +#ifdef CONFIG_COMPAT + +static inline int is_compat_task(void) +{ + return is_a32_compat_task(); +} + +#endif /* CONFIG_COMPAT */ + +static inline int is_compat_thread(struct thread_info *thread) +{ + return is_a32_compat_thread(thread); +} + + +#endif /* !__ASSEMBLY__ */ +#endif /* __ASM_IS_COMPAT_H */ diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h index 49780fb472c1..a71bab4554fe 100644 --- a/arch/arm64/include/asm/processor.h +++ b/arch/arm64/include/asm/processor.h @@ -36,6 +36,7 @@
#include <asm/alternative.h> #include <asm/cpufeature.h> +#include <asm/is_compat.h> #include <asm/hw_breakpoint.h> #include <asm/kasan.h> #include <asm/lse.h> @@ -64,11 +65,11 @@ #else #define TASK_SIZE_32 (UL(0x100000000) - PAGE_SIZE) #endif /* CONFIG_ARM64_64K_PAGES */ -#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ +#define TASK_SIZE (is_compat_task() ? \ TASK_SIZE_32 : TASK_SIZE_64) -#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ +#define TASK_SIZE_OF(tsk) (is_compat_thread(tsk) ? \ TASK_SIZE_32 : TASK_SIZE_64) -#define DEFAULT_MAP_WINDOW (test_thread_flag(TIF_32BIT) ? \ +#define DEFAULT_MAP_WINDOW (is_compat_task() ? \ TASK_SIZE_32 : DEFAULT_MAP_WINDOW_64) #else #define TASK_SIZE TASK_SIZE_64 @@ -85,7 +86,7 @@
#ifdef CONFIG_COMPAT #define AARCH32_VECTORS_BASE 0xffff0000 -#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ +#define STACK_TOP (is_compat_task() ? \ AARCH32_VECTORS_BASE : STACK_TOP_MAX) #else #define STACK_TOP STACK_TOP_MAX @@ -260,7 +261,7 @@ static inline void arch_thread_struct_whitelist(unsigned long *offset, #define task_user_tls(t) \ ({ \ unsigned long *__tls; \ - if (is_compat_thread(task_thread_info(t))) \ + if (is_a32_compat_thread(task_thread_info(t))) \ __tls = &(t)->thread.uw.tp2_value; \ else \ __tls = &(t)->thread.uw.tp_value; \ diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h index 4a838e0de048..2fcc64871267 100644 --- a/arch/arm64/include/asm/syscall.h +++ b/arch/arm64/include/asm/syscall.h @@ -79,7 +79,7 @@ static inline void syscall_get_arguments(struct task_struct *task, */ static inline int syscall_get_arch(struct task_struct *task) { - if (is_compat_thread(task_thread_info(task))) + if (is_a32_compat_thread(task_thread_info(task))) return AUDIT_ARCH_ARM;
return AUDIT_ARCH_AARCH64; diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h index 848739c15de8..558353015259 100644 --- a/arch/arm64/include/asm/thread_info.h +++ b/arch/arm64/include/asm/thread_info.h @@ -77,7 +77,7 @@ int arch_dup_task_struct(struct task_struct *dst, #define TIF_FREEZE 19 #define TIF_RESTORE_SIGMASK 20 #define TIF_SINGLESTEP 21 -#define TIF_32BIT 22 /* 32bit process */ +#define TIF_32BIT 22 /* AARCH32 process */ #define TIF_SVE 23 /* Scalable Vector Extension in use */ #define TIF_SVE_VL_INHERIT 24 /* Inherit SVE vl_onexec across exec */ #define TIF_SSBD 25 /* Wants SSB mitigation */ diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c index b29a311bb055..951e9b366c0c 100644 --- a/arch/arm64/kernel/hw_breakpoint.c +++ b/arch/arm64/kernel/hw_breakpoint.c @@ -157,7 +157,7 @@ enum hw_breakpoint_ops { HW_BREAKPOINT_RESTORE };
-static int is_compat_bp(struct perf_event *bp) +static int is_a32_compat_bp(struct perf_event *bp) { struct task_struct *tsk = bp->hw.target;
@@ -168,7 +168,7 @@ static int is_compat_bp(struct perf_event *bp) * deprecated behaviour if we use unaligned watchpoints in * AArch64 state. */ - return tsk && is_compat_thread(task_thread_info(tsk)); + return tsk && is_a32_compat_thread(task_thread_info(tsk)); }
/** @@ -467,7 +467,7 @@ static int arch_build_bp_info(struct perf_event *bp, * Watchpoints can be of length 1, 2, 4 or 8 bytes. */ if (hw->ctrl.type == ARM_BREAKPOINT_EXECUTE) { - if (is_compat_bp(bp)) { + if (is_a32_compat_bp(bp)) { if (hw->ctrl.len != ARM_BREAKPOINT_LEN_2 && hw->ctrl.len != ARM_BREAKPOINT_LEN_4) return -EINVAL; @@ -525,7 +525,7 @@ int hw_breakpoint_arch_parse(struct perf_event *bp, * AArch32 tasks expect some simple alignment fixups, so emulate * that here. */ - if (is_compat_bp(bp)) { + if (is_a32_compat_bp(bp)) { if (hw->ctrl.len == ARM_BREAKPOINT_LEN_8) alignment_mask = 0x7; else diff --git a/arch/arm64/kernel/perf_regs.c b/arch/arm64/kernel/perf_regs.c index 1497f1b3e2fb..49cde242c086 100644 --- a/arch/arm64/kernel/perf_regs.c +++ b/arch/arm64/kernel/perf_regs.c @@ -92,7 +92,7 @@ int perf_reg_validate(u64 mask)
u64 perf_reg_abi(struct task_struct *task) { - if (is_compat_thread(task_thread_info(task))) + if (is_a32_compat_thread(task_thread_info(task))) return PERF_SAMPLE_REGS_ABI_32; else return PERF_SAMPLE_REGS_ABI_64; diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index a48d2f596c07..cf7a1f7807d3 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -43,7 +43,6 @@ #include <linux/stacktrace.h>
#include <asm/alternative.h> -#include <asm/compat.h> #include <asm/cpufeature.h> #include <asm/cacheflush.h> #include <asm/exec.h> @@ -252,7 +251,7 @@ static void tls_thread_flush(void) if (system_supports_tpidr2()) write_sysreg_s(0, SYS_TPIDR2_EL0);
- if (is_compat_task()) { + if (is_a32_compat_task()) { current->thread.uw.tp_value = 0;
/* @@ -375,7 +374,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) p->thread.tpidr2_el0 = read_sysreg_s(SYS_TPIDR2_EL0);
if (stack_start) { - if (is_compat_thread(task_thread_info(p))) + if (is_a32_compat_thread(task_thread_info(p))) childregs->compat_sp = stack_start; else childregs->sp = stack_start; @@ -427,7 +426,7 @@ static void tls_thread_switch(struct task_struct *next) { tls_preserve_current_state();
- if (is_compat_thread(task_thread_info(next))) + if (is_a32_compat_thread(task_thread_info(next))) write_sysreg(next->thread.uw.tp_value, tpidrro_el0); else if (!arm64_kernel_unmapped_at_el0()) write_sysreg(0, tpidrro_el0); diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 824f8fec9869..a56ac28b1db6 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -29,7 +29,6 @@ #include <linux/regset.h> #include <linux/elf.h>
-#include <asm/compat.h> #include <asm/cpufeature.h> #include <asm/debug-monitors.h> #include <asm/fpsimd.h> @@ -174,7 +173,7 @@ static void ptrace_hbptriggered(struct perf_event *bp, const char *desc = "Hardware breakpoint trap (ptrace)";
#ifdef CONFIG_AARCH32_EL0 - if (is_compat_task()) { + if (is_a32_compat_task()) { int si_errno = 0; int i;
@@ -2102,9 +2101,9 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task) * 32-bit children use an extended user_aarch32_ptrace_view to allow * access to the TLS register. */ - if (is_compat_task()) + if (is_a32_compat_task()) return &user_aarch32_view; - else if (is_compat_thread(task_thread_info(task))) + else if (is_a32_compat_thread(task_thread_info(task))) return &user_aarch32_ptrace_view; #endif return &user_aarch64_view; @@ -2148,7 +2147,7 @@ static void report_syscall(struct pt_regs *regs, enum ptrace_syscall_dir dir) * - Syscall stops behave differently to seccomp and pseudo-step traps * (the latter do not nobble any registers). */ - regno = (is_compat_task() ? 12 : 7); + regno = (is_a32_compat_task() ? 12 : 7); saved_reg = regs->regs[regno]; regs->regs[regno] = dir;
@@ -2284,7 +2283,7 @@ int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task) /* https://lore.kernel.org/lkml/20191118131525.GA4180@willie-the-truck */ user_regs_reset_single_step(regs, task);
- if (is_compat_thread(task_thread_info(task))) + if (is_a32_compat_thread(task_thread_info(task))) return valid_compat_regs(regs); else return valid_native_regs(regs); diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index 1bb556dd823b..a11d092d6580 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -1162,7 +1162,7 @@ static int setup_rt_frame(int usig, struct ksignal *ksig, sigset_t *set,
static void setup_restart_syscall(struct pt_regs *regs) { - if (is_compat_task()) + if (is_a32_compat_task()) a32_setup_restart_syscall(regs); else regs->regs[8] = __NR_restart_syscall; @@ -1182,7 +1182,7 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) /* * Set up the stack frame */ - if (is_compat_task()) { + if (is_a32_compat_task()) { if (ksig->ka.sa.sa_flags & SA_SIGINFO) ret = a32_setup_rt_frame(usig, ksig, oldset, regs); else diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c index 8b1e63f20d86..75a833efd846 100644 --- a/arch/arm64/kernel/syscall.c +++ b/arch/arm64/kernel/syscall.c @@ -23,7 +23,7 @@ static long do_ni_syscall(struct pt_regs *regs, int scno) { #ifdef CONFIG_AARCH32_EL0 long ret; - if (is_compat_task()) { + if (is_a32_compat_task()) { ret = a32_arm_syscall(regs, scno); if (ret != -ENOSYS) return ret; diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index ba469e91f0d8..c7f068574757 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -8,6 +8,7 @@
#include <linux/bug.h> #include <linux/context_tracking.h> +#include <linux/compat.h> #include <linux/signal.h> #include <linux/kallsyms.h> #include <linux/kprobes.h>