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authorChris Metcalf <cmetcalf@ezchip.com>2015-10-06 12:37:41 -0400
committerChris Metcalf <cmetcalf@ezchip.com>2015-10-06 14:53:18 -0400
commit990486c8af044f89bddfbde1d1cf9fde449bedbf (patch)
tree145c16309dfc5586b5120d7b7c7d585337e8d5d1 /lib
parentc753bf34c94e5ac901e625e52f47320eeec4de2d (diff)
downloadop-kernel-dev-990486c8af044f89bddfbde1d1cf9fde449bedbf.zip
op-kernel-dev-990486c8af044f89bddfbde1d1cf9fde449bedbf.tar.gz
strscpy: zero any trailing garbage bytes in the destination
It's possible that the destination can be shadowed in userspace (as, for example, the perf buffers are now). So we should take care not to leak data that could be inspected by userspace. Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/string.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/string.c b/lib/string.c
index 8dbb7b1..84775ba 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -203,12 +203,13 @@ ssize_t strscpy(char *dest, const char *src, size_t count)
unsigned long c, data;
c = *(unsigned long *)(src+res);
- *(unsigned long *)(dest+res) = c;
if (has_zero(c, &data, &constants)) {
data = prep_zero_mask(c, data, &constants);
data = create_zero_mask(data);
+ *(unsigned long *)(dest+res) = c & zero_bytemask(data);
return res + find_zero(data);
}
+ *(unsigned long *)(dest+res) = c;
res += sizeof(unsigned long);
count -= sizeof(unsigned long);
max -= sizeof(unsigned long);
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