https://bugs.kde.org/show_bug.cgi?id=380397
Bug ID: 380397
Summary: s390x: False-positive "invalid read" for strtok()
Product: valgrind
Version: 3.13 SVN
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: ar...@linux.vnet.ibm.com
Target Milestone: ---
With glibc 2.24, valgrind emits three "invalid read of size 1" for the program
below. This is because the strtok implementation on s390x invokes
__strcspn_c(), which operates 4-byte-wise on a word-aligned string pointer.
The "invalid reads" refer to the three bytes between the 5-byte buffer and the
next word boundary.
On some other platforms the strtok implementation calls strcspn via a PLT slot,
in which case Valgrind's replacement for strcspn gets invoked instead.
-- >8 --
#include <string.h>
int main(int argc, char *argv[])
{
strtok(strdup("xxxx"), "ab");
return 0;
}
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