From: Yury Norov ynorov@caviumnetworks.com
maillist inclusion category: feature bugzilla: 46790 CVE: NA
Reference: https://github.com/norov/linux/commits/ilp32-5.2
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According to userspace/kernel ABI, userspace off_t is passed in register pair just like in aarch32. In this patch corresponding aarch32 handlers are shared to ilp32 code.
Signed-off-by: Yury Norov ynorov@caviumnetworks.com Signed-off-by: Yury Norov ynorov@marvell.com Signed-off-by: Xiongfeng Wang wangxiongfeng2@huawei.com --- arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/sys32.c | 102 ----------------------------- arch/arm64/kernel/sys32_common.c | 106 +++++++++++++++++++++++++++++++ 3 files changed, 107 insertions(+), 102 deletions(-) create mode 100644 arch/arm64/kernel/sys32_common.c
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 2ffa09cbef65..79f5c37abe13 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -30,6 +30,7 @@ obj-$(CONFIG_AARCH32_EL0) += binfmt_elf32.o sys32.o signal32.o \ obj-$(CONFIG_AARCH32_EL0) += sigreturn32.o obj-$(CONFIG_KUSER_HELPERS) += kuser32.o obj-$(CONFIG_ARM64_ILP32) += binfmt_ilp32.o +obj-$(CONFIG_COMPAT) += sys32_common.o obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o entry-ftrace.o obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_ARM64_MODULE_PLTS) += module-plts.o diff --git a/arch/arm64/kernel/sys32.c b/arch/arm64/kernel/sys32.c index 3c3c13a9dde3..7577acaae911 100644 --- a/arch/arm64/kernel/sys32.c +++ b/arch/arm64/kernel/sys32.c @@ -20,108 +20,6 @@ asmlinkage long compat_sys_sigreturn(void); asmlinkage long compat_sys_rt_sigreturn(void);
-COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname, - compat_size_t, sz, struct compat_statfs64 __user *, buf) -{ - /* - * 32-bit ARM applies an OABI compatibility fixup to statfs64 and - * fstatfs64 regardless of whether OABI is in use, and therefore - * arbitrary binaries may rely upon it, so we must do the same. - * For more details, see commit: - * - * 713c481519f19df9 ("[ARM] 3108/2: old ABI compat: statfs64 and - * fstatfs64") - */ - if (sz == 88) - sz = 84; - - return kcompat_sys_statfs64(pathname, sz, buf); -} - -COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64, unsigned int, fd, compat_size_t, sz, - struct compat_statfs64 __user *, buf) -{ - /* see aarch32_statfs64 */ - if (sz == 88) - sz = 84; - - return kcompat_sys_fstatfs64(fd, sz, buf); -} - -/* - * Note: off_4k is always in units of 4K. If we can't do the - * requested offset because it is not page-aligned, we return -EINVAL. - */ -COMPAT_SYSCALL_DEFINE6(aarch32_mmap2, unsigned long, addr, unsigned long, len, - unsigned long, prot, unsigned long, flags, - unsigned long, fd, unsigned long, off_4k) -{ - if (off_4k & (~PAGE_MASK >> 12)) - return -EINVAL; - - off_4k >>= (PAGE_SHIFT - 12); - - return ksys_mmap_pgoff(addr, len, prot, flags, fd, off_4k); -} - -#ifdef CONFIG_CPU_BIG_ENDIAN -#define arg_u32p(name) u32, name##_hi, u32, name##_lo -#else -#define arg_u32p(name) u32, name##_lo, u32, name##_hi -#endif - -#define arg_u64(name) (((u64)name##_hi << 32) | name##_lo) - -COMPAT_SYSCALL_DEFINE6(aarch32_pread64, unsigned int, fd, char __user *, buf, - size_t, count, u32, __pad, arg_u32p(pos)) -{ - return ksys_pread64(fd, buf, count, arg_u64(pos)); -} - -COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64, unsigned int, fd, - const char __user *, buf, size_t, count, u32, __pad, - arg_u32p(pos)) -{ - return ksys_pwrite64(fd, buf, count, arg_u64(pos)); -} - -COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname, - u32, __pad, arg_u32p(length)) -{ - return ksys_truncate(pathname, arg_u64(length)); -} - -COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad, - arg_u32p(length)) -{ - return ksys_ftruncate(fd, arg_u64(length)); -} - -COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad, - arg_u32p(offset), size_t, count) -{ - return ksys_readahead(fd, arg_u64(offset), count); -} - -COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64, int, fd, int, advice, - arg_u32p(offset), arg_u32p(len)) -{ - return ksys_fadvise64_64(fd, arg_u64(offset), arg_u64(len), advice); -} - -COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2, int, fd, unsigned int, flags, - arg_u32p(offset), arg_u32p(nbytes)) -{ - return ksys_sync_file_range(fd, arg_u64(offset), arg_u64(nbytes), - flags); -} - -COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode, - arg_u32p(offset), arg_u32p(len)) -{ - return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len)); -} - #undef __SYSCALL #define __SYSCALL(nr, sym) asmlinkage long __arm64_##sym(const struct pt_regs *); #include <asm/unistd32.h> diff --git a/arch/arm64/kernel/sys32_common.c b/arch/arm64/kernel/sys32_common.c new file mode 100644 index 000000000000..bbf81d8991ba --- /dev/null +++ b/arch/arm64/kernel/sys32_common.c @@ -0,0 +1,106 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/compat.h> +#include <linux/syscalls.h> + +COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname, + compat_size_t, sz, struct compat_statfs64 __user *, buf) +{ + /* + * 32-bit ARM applies an OABI compatibility fixup to statfs64 and + * fstatfs64 regardless of whether OABI is in use, and therefore + * arbitrary binaries may rely upon it, so we must do the same. + * For more details, see commit: + * + * 713c481519f19df9 ("[ARM] 3108/2: old ABI compat: statfs64 and + * fstatfs64") + */ + if (sz == 88) + sz = 84; + + return kcompat_sys_statfs64(pathname, sz, buf); +} + +COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64, unsigned int, fd, compat_size_t, sz, + struct compat_statfs64 __user *, buf) +{ + /* see aarch32_statfs64 */ + if (sz == 88) + sz = 84; + + return kcompat_sys_fstatfs64(fd, sz, buf); +} + +/* + * Note: off_4k is always in units of 4K. If we can't do the + * requested offset because it is not page-aligned, we return -EINVAL. + */ +COMPAT_SYSCALL_DEFINE6(aarch32_mmap2, unsigned long, addr, unsigned long, len, + unsigned long, prot, unsigned long, flags, + unsigned long, fd, unsigned long, off_4k) +{ + if (off_4k & (~PAGE_MASK >> 12)) + return -EINVAL; + + off_4k >>= (PAGE_SHIFT - 12); + + return ksys_mmap_pgoff(addr, len, prot, flags, fd, off_4k); +} + +#ifdef CONFIG_CPU_BIG_ENDIAN +#define arg_u32p(name) u32, name##_hi, u32, name##_lo +#else +#define arg_u32p(name) u32, name##_lo, u32, name##_hi +#endif + +#define arg_u64(name) (((u64)name##_hi << 32) | name##_lo) + +COMPAT_SYSCALL_DEFINE6(aarch32_pread64, unsigned int, fd, char __user *, buf, + size_t, count, u32, __pad, arg_u32p(pos)) +{ + return ksys_pread64(fd, buf, count, arg_u64(pos)); +} + +COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64, unsigned int, fd, + const char __user *, buf, size_t, count, u32, __pad, + arg_u32p(pos)) +{ + return ksys_pwrite64(fd, buf, count, arg_u64(pos)); +} + +COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname, + u32, __pad, arg_u32p(length)) +{ + return ksys_truncate(pathname, arg_u64(length)); +} + +COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad, + arg_u32p(length)) +{ + return ksys_ftruncate(fd, arg_u64(length)); +} + +COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad, + arg_u32p(offset), size_t, count) +{ + return ksys_readahead(fd, arg_u64(offset), count); +} + +COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64, int, fd, int, advice, + arg_u32p(offset), arg_u32p(len)) +{ + return ksys_fadvise64_64(fd, arg_u64(offset), arg_u64(len), advice); +} + +COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2, int, fd, unsigned int, flags, + arg_u32p(offset), arg_u32p(nbytes)) +{ + return ksys_sync_file_range(fd, arg_u64(offset), arg_u64(nbytes), + flags); +} + +COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode, + arg_u32p(offset), arg_u32p(len)) +{ + return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len)); +}