Patch "kasan, fortify: properly rename memintrinsics" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    kasan, fortify: properly rename memintrinsics

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kasan-fortify-properly-rename-memintrinsics.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d6e02b2d0b33316fc7884555e6bd888c291085c3
Author: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Date:   Fri May 17 15:01:18 2024 +0200

    kasan, fortify: properly rename memintrinsics
    
    [ Upstream commit 2e577732e8d28b9183df701fb90cb7943aa4ed16 ]
    
    After commit 69d4c0d32186 ("entry, kasan, x86: Disallow overriding mem*()
    functions") and the follow-up fixes, with CONFIG_FORTIFY_SOURCE enabled,
    even though the compiler instruments meminstrinsics by generating calls to
    __asan/__hwasan_ prefixed functions, FORTIFY_SOURCE still uses
    uninstrumented memset/memmove/memcpy as the underlying functions.
    
    As a result, KASAN cannot detect bad accesses in memset/memmove/memcpy.
    This also makes KASAN tests corrupt kernel memory and cause crashes.
    
    To fix this, use __asan_/__hwasan_memset/memmove/memcpy as the underlying
    functions whenever appropriate.  Do this only for the instrumented code
    (as indicated by __SANITIZE_ADDRESS__).
    
    Link: https://lkml.kernel.org/r/20240517130118.759301-1-andrey.konovalov@xxxxxxxxx
    Fixes: 69d4c0d32186 ("entry, kasan, x86: Disallow overriding mem*() functions")
    Fixes: 51287dcb00cc ("kasan: emit different calls for instrumentable memintrinsics")
    Fixes: 36be5cba99f6 ("kasan: treat meminstrinsic as builtins in uninstrumented files")
    Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxx>
    Reported-by: Erhard Furtner <erhard_f@xxxxxxxxxxx>
    Reported-by: Nico Pache <npache@xxxxxxxxxx>
    Closes: https://lore.kernel.org/all/20240501144156.17e65021@xxxxxxxxxxxxx/
    Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
    Tested-by: Nico Pache <npache@xxxxxxxxxx>
    Acked-by: Nico Pache <npache@xxxxxxxxxx>
    Cc: Alexander Potapenko <glider@xxxxxxxxxx>
    Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
    Cc: Daniel Axtens <dja@xxxxxxxxxx>
    Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
    Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/include/linux/fortify-string.h b/include/linux/fortify-string.h
index da51a83b28293..f7e1895367fa1 100644
--- a/include/linux/fortify-string.h
+++ b/include/linux/fortify-string.h
@@ -31,17 +31,30 @@ void __write_overflow_field(size_t avail, size_t wanted) __compiletime_warning("
 	__ret;							\
 })
 
-#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
+#if defined(__SANITIZE_ADDRESS__)
+
+#if !defined(CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX) && !defined(CONFIG_GENERIC_ENTRY)
+extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset);
+extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove);
+extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
+#elif defined(CONFIG_KASAN_GENERIC)
+extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(__asan_memset);
+extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(__asan_memmove);
+extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(__asan_memcpy);
+#else /* CONFIG_KASAN_SW_TAGS */
+extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(__hwasan_memset);
+extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(__hwasan_memmove);
+extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(__hwasan_memcpy);
+#endif
+
 extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr);
 extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp);
-extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
-extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove);
-extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset);
 extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat);
 extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy);
 extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen);
 extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat);
 extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy);
+
 #else
 
 #if defined(__SANITIZE_MEMORY__)
@@ -66,6 +79,7 @@ extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size)
 #define __underlying_strlen	__builtin_strlen
 #define __underlying_strncat	__builtin_strncat
 #define __underlying_strncpy	__builtin_strncpy
+
 #endif
 
 /**




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