The patch titled
Subject: fortify: use WARN instead of BUG for now
has been removed from the -mm tree. Its filename was
fortify-use-warn-instead-of-bug-for-now.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: fortify: use WARN instead of BUG for now
While CONFIG_FORTIFY_SOURCE continues to shake out, don't unconditionally
use BUG(), opting instead for WARN(). This also renames fortify_panic()
to fortify_overflow() which better matches what it is being called for.
[akpm@xxxxxxxxxxxxxxxxxxxx: remove fortify_overflow from tools/objtool/check.c:global_noreturns, per Josh]
Link: http://lkml.kernel.org/r/20170726185219.GA57833@beast
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Daniel Micay <danielmicay@xxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/boot/compressed/misc.c | 2 +-
include/linux/string.h | 30 +++++++++++++++---------------
lib/string.c | 7 +++----
tools/objtool/check.c | 1 -
4 files changed, 19 insertions(+), 21 deletions(-)
diff -puN arch/x86/boot/compressed/misc.c~fortify-use-warn-instead-of-bug-for-now arch/x86/boot/compressed/misc.c
--- a/arch/x86/boot/compressed/misc.c~fortify-use-warn-instead-of-bug-for-now
+++ a/arch/x86/boot/compressed/misc.c
@@ -412,7 +412,7 @@ asmlinkage __visible void *extract_kerne
return output;
}
-void fortify_panic(const char *name)
+void fortify_overflow(const char *name)
{
error("detected buffer overflow");
}
diff -puN include/linux/string.h~fortify-use-warn-instead-of-bug-for-now include/linux/string.h
--- a/include/linux/string.h~fortify-use-warn-instead-of-bug-for-now
+++ a/include/linux/string.h
@@ -197,7 +197,7 @@ static inline const char *kbasename(cons
#define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline))
#define __RENAME(x) __asm__(#x)
-void fortify_panic(const char *name) __noreturn __cold;
+void fortify_overflow(const char *name) __cold;
void __read_overflow(void) __compiletime_error("detected read beyond size of object passed as 1st parameter");
void __read_overflow2(void) __compiletime_error("detected read beyond size of object passed as 2nd parameter");
void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter");
@@ -209,7 +209,7 @@ __FORTIFY_INLINE char *strncpy(char *p,
if (__builtin_constant_p(size) && p_size < size)
__write_overflow();
if (p_size < size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return __builtin_strncpy(p, q, size);
}
@@ -219,7 +219,7 @@ __FORTIFY_INLINE char *strcat(char *p, c
if (p_size == (size_t)-1)
return __builtin_strcat(p, q);
if (strlcat(p, q, p_size) >= p_size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return p;
}
@@ -231,7 +231,7 @@ __FORTIFY_INLINE __kernel_size_t strlen(
return __builtin_strlen(p);
ret = strnlen(p, p_size);
if (p_size <= ret)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return ret;
}
@@ -241,7 +241,7 @@ __FORTIFY_INLINE __kernel_size_t strnlen
size_t p_size = __builtin_object_size(p, 0);
__kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size);
if (p_size <= ret && maxlen != ret)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return ret;
}
@@ -260,7 +260,7 @@ __FORTIFY_INLINE size_t strlcpy(char *p,
if (__builtin_constant_p(len) && len >= p_size)
__write_overflow();
if (len >= p_size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
__builtin_memcpy(p, q, len);
p[len] = '\0';
}
@@ -278,7 +278,7 @@ __FORTIFY_INLINE char *strncat(char *p,
p_len = strlen(p);
copy_len = strnlen(q, count);
if (p_size < p_len + copy_len + 1)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
__builtin_memcpy(p + p_len, q, copy_len);
p[p_len + copy_len] = '\0';
return p;
@@ -290,7 +290,7 @@ __FORTIFY_INLINE void *memset(void *p, i
if (__builtin_constant_p(size) && p_size < size)
__write_overflow();
if (p_size < size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return __builtin_memset(p, c, size);
}
@@ -305,7 +305,7 @@ __FORTIFY_INLINE void *memcpy(void *p, c
__read_overflow2();
}
if (p_size < size || q_size < size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return __builtin_memcpy(p, q, size);
}
@@ -320,7 +320,7 @@ __FORTIFY_INLINE void *memmove(void *p,
__read_overflow2();
}
if (p_size < size || q_size < size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return __builtin_memmove(p, q, size);
}
@@ -331,7 +331,7 @@ __FORTIFY_INLINE void *memscan(void *p,
if (__builtin_constant_p(size) && p_size < size)
__read_overflow();
if (p_size < size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return __real_memscan(p, c, size);
}
@@ -346,7 +346,7 @@ __FORTIFY_INLINE int memcmp(const void *
__read_overflow2();
}
if (p_size < size || q_size < size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return __builtin_memcmp(p, q, size);
}
@@ -356,7 +356,7 @@ __FORTIFY_INLINE void *memchr(const void
if (__builtin_constant_p(size) && p_size < size)
__read_overflow();
if (p_size < size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return __builtin_memchr(p, c, size);
}
@@ -367,7 +367,7 @@ __FORTIFY_INLINE void *memchr_inv(const
if (__builtin_constant_p(size) && p_size < size)
__read_overflow();
if (p_size < size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return __real_memchr_inv(p, c, size);
}
@@ -378,7 +378,7 @@ __FORTIFY_INLINE void *kmemdup(const voi
if (__builtin_constant_p(size) && p_size < size)
__read_overflow();
if (p_size < size)
- fortify_panic(__func__);
+ fortify_overflow(__func__);
return __real_kmemdup(p, size, gfp);
}
diff -puN lib/string.c~fortify-use-warn-instead-of-bug-for-now lib/string.c
--- a/lib/string.c~fortify-use-warn-instead-of-bug-for-now
+++ a/lib/string.c
@@ -979,9 +979,8 @@ char *strreplace(char *s, char old, char
}
EXPORT_SYMBOL(strreplace);
-void fortify_panic(const char *name)
+void fortify_overflow(const char *name)
{
- pr_emerg("detected buffer overflow in %s\n", name);
- BUG();
+ WARN(1, "detected buffer overflow in %s\n", name);
}
-EXPORT_SYMBOL(fortify_panic);
+EXPORT_SYMBOL(fortify_overflow);
diff -puN tools/objtool/check.c~fortify-use-warn-instead-of-bug-for-now tools/objtool/check.c
--- a/tools/objtool/check.c~fortify-use-warn-instead-of-bug-for-now
+++ a/tools/objtool/check.c
@@ -156,7 +156,6 @@ static int __dead_end_function(struct ob
"kvm_spurious_fault",
"__reiserfs_panic",
"lbug_with_loc",
- "fortify_panic",
};
if (func->bind == STB_WEAK)
_
Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are
mm-add-slub-free-list-pointer-obfuscation.patch
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