The arm mmap2 syscall takes the offset in units of 4K, thus with 64K pages the offset needs to be scaled to units of pages.
Signed-off-by: Andreas Schwab <sch...@suse.de> --- arch/arm64/include/asm/unistd32.h | 2 +- arch/arm64/kernel/entry32.S | 18 ++++++++++++++++++ arch/arm64/kernel/sys32.c | 6 ++++++ 3 files changed, 25 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h index 2722442..cef934a 100644 --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -406,7 +406,7 @@ __SYSCALL(__NR_vfork, sys_vfork) #define __NR_ugetrlimit 191 /* SuS compliant getrlimit */ __SYSCALL(__NR_ugetrlimit, compat_sys_getrlimit) /* SuS compliant getrlimit */ #define __NR_mmap2 192 -__SYSCALL(__NR_mmap2, sys_mmap_pgoff) +__SYSCALL(__NR_mmap2, compat_sys_mmap2_wrapper) #define __NR_truncate64 193 __SYSCALL(__NR_truncate64, compat_sys_truncate64_wrapper) #define __NR_ftruncate64 194 diff --git a/arch/arm64/kernel/entry32.S b/arch/arm64/kernel/entry32.S index 9a8f6ae..17f3296 100644 --- a/arch/arm64/kernel/entry32.S +++ b/arch/arm64/kernel/entry32.S @@ -19,9 +19,12 @@ */ #include <linux/linkage.h> +#include <linux/const.h> #include <asm/assembler.h> #include <asm/asm-offsets.h> +#include <asm/errno.h> +#include <asm/page.h> /* * System call wrappers for the AArch32 compatibility layer. @@ -54,6 +57,21 @@ ENTRY(compat_sys_fstatfs64_wrapper) ENDPROC(compat_sys_fstatfs64_wrapper) /* + * Note: off_4k (w5) is always units of 4K. If we can't do the requested + * offset, we return EINVAL. + */ +#if PAGE_SHIFT > 12 +ENTRY(compat_sys_mmap2_wrapper) + tst w5, #~PAGE_MASK >> 12 + b.ne 1f + lsr w5, w5, #PAGE_SHIFT - 12 + b sys_mmap_pgoff +1: mov x0, #-EINVAL + ret lr +ENDPROC(compat_sys_mmap2_wrapper) +#endif + +/* * Wrappers for AArch32 syscalls that either take 64-bit parameters * in registers or that take 32-bit parameters which require sign * extension. diff --git a/arch/arm64/kernel/sys32.c b/arch/arm64/kernel/sys32.c index 2d5ab3c..7800bb1 100644 --- a/arch/arm64/kernel/sys32.c +++ b/arch/arm64/kernel/sys32.c @@ -24,6 +24,7 @@ #include <linux/compiler.h> #include <linux/syscalls.h> +#include <asm/page.h> asmlinkage long compat_sys_sigreturn_wrapper(void); asmlinkage long compat_sys_rt_sigreturn_wrapper(void); @@ -37,6 +38,11 @@ asmlinkage long compat_sys_readahead_wrapper(void); asmlinkage long compat_sys_fadvise64_64_wrapper(void); asmlinkage long compat_sys_sync_file_range2_wrapper(void); asmlinkage long compat_sys_fallocate_wrapper(void); +#if PAGE_SHIFT > 12 +asmlinkage long compat_sys_mmap2_wrapper(void); +#else +#define compat_sys_mmap2_wrapper sys_mmap_pgoff +#endif #undef __SYSCALL #define __SYSCALL(nr, sym) [nr] = sym, -- 2.3.2 -- Andreas Schwab, SUSE Labs, sch...@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different." -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
