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author | David S. Miller <davem@davemloft.net> | 2010-02-19 15:19:52 -0800 |
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committer | David S. Miller <davem@davemloft.net> | 2010-02-19 15:19:52 -0800 |
commit | 1f474646fdc36b457606bbcd6a3592e6cbd31ac4 (patch) | |
tree | 706149d39c9de0bc0ceacfb2ab44e909caba5b3c /arch/sparc/include/asm/stat.h | |
parent | d7ecfb3c2aa155c9f6152ebe91de92067d16ba6e (diff) |
sparc64: Fix sun4u execute bit check in TSB I-TLB load.
Thanks to testcase and report from Brad Spengler:
--------------------
#include <stdio.h>
typedef int (* _wee)(void);
int main(void)
{
char buf[8] = { '\x81', '\xc7', '\xe0', '\x08', '\x81', '\xe8',
'\x00', '\x00' };
_wee wee;
printf("%p\n", &buf);
wee = (_wee)&buf;
wee();
return 0;
}
--------------------
TSB I-tlb load code tries to use andcc to check the _PAGE_EXEC_4U bit,
but that's bit 12 so it gets sign extended all the way up to bit 63
and the test nearly always passes as a result.
Use sethi to fix the bug.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/include/asm/stat.h')
0 files changed, 0 insertions, 0 deletions