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random: add and use memzero_explicit() for clearing data 

commit d4c5efdb97 upstream.

zatimend has reported that in his environment (3.16/gcc4.8.3/corei7)
memset() calls which clear out sensitive data in extract_{buf,entropy,
entropy_user}() in random driver are being optimized away by gcc.

Add a helper memzero_explicit() (similarly as explicit_bzero() variants)
that can be used in such cases where a variable with sensitive data is
being cleared out in the end. Other use cases might also be in crypto
code. [ I have put this into lib/string.c though, as it's always built-in
and doesn't need any dependencies then. ]

Fixes kernel bugzilla: 82041

Reported-by: zatimend@hotmail.co.uk
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
[lizf: Backported to 3.4:
 - adjust context
 - another memset() in extract_buf() needs to be converted]
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Daniel Borkmann 2014-08-26 23:16:35 -04:00 committed by Zefan Li
parent e4425815a8
commit 6a16b0d080
3 changed files with 24 additions and 6 deletions
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10
drivers/char/random.c
View File

@ -932,8 +932,8 @@ static void extract_buf(struct entropy_store *r, __u8 *out)
* pool while mixing, and hash one final time.
*/
sha_transform(hash.w, extract, workspace);
memset(extract, 0, sizeof(extract));
memset(workspace, 0, sizeof(workspace));
memzero_explicit(extract, sizeof(extract));
memzero_explicit(workspace, sizeof(workspace));
/*
* In case the hash function has some recognizable output
@ -956,7 +956,7 @@ static void extract_buf(struct entropy_store *r, __u8 *out)
}
memcpy(out, &hash, EXTRACT_SIZE);
memset(&hash, 0, sizeof(hash));
memzero_explicit(&hash, sizeof(hash));
}
static ssize_t extract_entropy(struct entropy_store *r, void *buf,
@ -989,7 +989,7 @@ static ssize_t extract_entropy(struct entropy_store *r, void *buf,
}
/* Wipe data just returned from memory */
memset(tmp, 0, sizeof(tmp));
memzero_explicit(tmp, sizeof(tmp));
return ret;
}
@ -1027,7 +1027,7 @@ static ssize_t extract_entropy_user(struct entropy_store *r, void __user *buf,
}
/* Wipe data just returned from memory */
memset(tmp, 0, sizeof(tmp));
memzero_explicit(tmp, sizeof(tmp));
return ret;
}

4
include/linux/string.h
View File

@ -133,7 +133,7 @@ int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) __printf(3, 4);
#endif
extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
const void *from, size_t available);
const void *from, size_t available);
/**
* strstarts - does @str start with @prefix?
@ -144,5 +144,7 @@ static inline bool strstarts(const char *str, const char *prefix)
{
return strncmp(str, prefix, strlen(prefix)) == 0;
}
void memzero_explicit(void *s, size_t count);
#endif
#endif /* _LINUX_STRING_H_ */

16
lib/string.c
View File

@ -586,6 +586,22 @@ void *memset(void *s, int c, size_t count)
EXPORT_SYMBOL(memset);
#endif
/**
* memzero_explicit - Fill a region of memory (e.g. sensitive
* keying data) with 0s.
* @s: Pointer to the start of the area.
* @count: The size of the area.
*
* memzero_explicit() doesn't need an arch-specific version as
* it just invokes the one of memset() implicitly.
*/
void memzero_explicit(void *s, size_t count)
{
memset(s, 0, count);
OPTIMIZER_HIDE_VAR(s);
}
EXPORT_SYMBOL(memzero_explicit);
#ifndef __HAVE_ARCH_MEMCPY
/**
* memcpy - Copy one area of memory to another