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| author |   Max Filippov <jcmvbkbc@gmail.com> | 2017-12-17 14:43:15 -0800 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2017-12-17 15:34:57 -0800 |
| commit | 57358ba9564a0520f870dc14a0f91e7dacc18236 (patch) | |
| tree | 616be15e6bbe43bbf7539a359b3485b070f62920 /arch/xtensa | |
| parent | xtensa: use __memset in __xtensa_clear_user (diff) | |
| download | linux-dev-57358ba9564a0520f870dc14a0f91e7dacc18236.tar.xz linux-dev-57358ba9564a0520f870dc14a0f91e7dacc18236.zip | |
xtensa: use generic strncpy_from_user with KASAN
This enables KASAN check of the destination buffer.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa')
| -rw-r--r-- | arch/xtensa/Kconfig | 1 | ||||
| -rw-r--r-- | arch/xtensa/include/asm/uaccess.h | 7 | ||||
| -rw-r--r-- | arch/xtensa/kernel/xtensa_ksyms.c | 2 |
3 files changed, 10 insertions, 0 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index f9f95d6e8da8..e2afffb71a6b 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -15,6 +15,7 @@ config XTENSA select GENERIC_IRQ_SHOW select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK + select GENERIC_STRNCPY_FROM_USER if KASAN select HAVE_ARCH_KASAN if MMU select HAVE_CC_STACKPROTECTOR select HAVE_DEBUG_KMEMLEAK diff --git a/arch/xtensa/include/asm/uaccess.h b/arch/xtensa/include/asm/uaccess.h index 18bbe1caad94..f1158b4c629c 100644 --- a/arch/xtensa/include/asm/uaccess.h +++ b/arch/xtensa/include/asm/uaccess.h @@ -44,6 +44,8 @@ #define __access_ok(addr, size) (__kernel_ok || __user_ok((addr), (size))) #define access_ok(type, addr, size) __access_ok((unsigned long)(addr), (size)) +#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE) + /* * These are the main single-value transfer routines. They * automatically use the right size if we just have the right pointer @@ -277,6 +279,8 @@ clear_user(void *addr, unsigned long size) #define __clear_user __xtensa_clear_user +#ifndef CONFIG_GENERIC_STRNCPY_FROM_USER + extern long __strncpy_user(char *, const char *, long); static inline long @@ -286,6 +290,9 @@ strncpy_from_user(char *dst, const char *src, long count) return __strncpy_user(dst, src, count); return -EFAULT; } +#else +long strncpy_from_user(char *dst, const char *src, long count); +#endif /* * Return the size of a string (including the ending 0!) diff --git a/arch/xtensa/kernel/xtensa_ksyms.c b/arch/xtensa/kernel/xtensa_ksyms.c index 3a443f83ae87..04f19de46700 100644 --- a/arch/xtensa/kernel/xtensa_ksyms.c +++ b/arch/xtensa/kernel/xtensa_ksyms.c @@ -44,7 +44,9 @@ EXPORT_SYMBOL(memmove); EXPORT_SYMBOL(__memset); EXPORT_SYMBOL(__memcpy); EXPORT_SYMBOL(__memmove); +#ifndef CONFIG_GENERIC_STRNCPY_FROM_USER EXPORT_SYMBOL(__strncpy_user); +#endif EXPORT_SYMBOL(clear_page); EXPORT_SYMBOL(copy_page); |