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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2023-01-19 12:56:12 +0300 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2023-01-19 12:56:12 +0300 |
| commit | 6f84981772535e670e4e2df051a672af229b6694 (patch) | |
| tree | 407cec2ba38b75fc2a1bdefae5b6d3c6405be435 /include/linux/stackprotector.h | |
| parent | cba83c1fc38612c3d2c7b1bfed9d882e4848fb0d (diff) | |
| parent | 0b45ac1170ea6416bc1d36798414c04870cd356d (diff) | |
| download | linux-6f84981772535e670e4e2df051a672af229b6694.tar.xz | |
Merge drm/drm-next into drm-misc-next
Backmerging into drm-misc-next to get DRM accelerator infrastructure,
which is required by ipuv driver.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Diffstat (limited to 'include/linux/stackprotector.h')
| -rw-r--r-- | include/linux/stackprotector.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/stackprotector.h b/include/linux/stackprotector.h index 4c678c4fec58..9c88707d9a0f 100644 --- a/include/linux/stackprotector.h +++ b/include/linux/stackprotector.h @@ -6,6 +6,25 @@ #include <linux/sched.h> #include <linux/random.h> +/* + * On 64-bit architectures, protect against non-terminated C string overflows + * by zeroing out the first byte of the canary; this leaves 56 bits of entropy. + */ +#ifdef CONFIG_64BIT +# ifdef __LITTLE_ENDIAN +# define CANARY_MASK 0xffffffffffffff00UL +# else /* big endian, 64 bits: */ +# define CANARY_MASK 0x00ffffffffffffffUL +# endif +#else /* 32 bits: */ +# define CANARY_MASK 0xffffffffUL +#endif + +static inline unsigned long get_random_canary(void) +{ + return get_random_long() & CANARY_MASK; +} + #if defined(CONFIG_STACKPROTECTOR) || defined(CONFIG_ARM64_PTR_AUTH) # include <asm/stackprotector.h> #else |