PATCH: bug in gcc.c-torture/execute/960327-1.c: overwrites stack-frame.
Jeffrey A Law
Wed Apr 5 09:26:00 GMT 2000
In message < 200004041548.RAA29553@ignucius.axis.se >you write:
> The bug is that the sprintf "X" writing to s + 12 will
> overwrite 'X' replacing the \0 that ends the string, but also
> write a \0 at the location *after that* in the stack-frame. For
> many targets there's pad or nothing of importance there. For
> some targets this is the low byte of the return address.
> Wheee... (imagine ejection seat activated indoors).
> Although this change looks safe, I might be tampering with the original
> purpose of the test. Is there anyone around that remembers this test and
> can comment?
> Ok to install?
> Tue Apr 4 17:10:57 2000 Hans-Peter Nilsson <email@example.com>
> * execute/960327-1.c (f): Add a letter to s to avoid stack-frame
I thought the test looked familiar -- it turns out to be one of mine. I
went back and scanned my old mail archives and found the description of the
Basically combine was not initializing reg_nonzero_bits and reg_sign_bit_copies
for auto-incremented registers.
I reverted the fix to combine, then applied your change to 960327-1.c and
verified that the test fails. So your change does not compromise the
Please install your change to 960327-1.c
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