• Heiko Carstens's avatar
    s390/vdso: fix stack corruption · 9b2efe03
    Heiko Carstens authored
    The kernel provided vdso functions do not get a stack frame from the
    calling function and therefore may not change the stack contents, unless
    they allocate space on their own.
    
    This problem was exposed with 070b7be6 "s390/vdso: replace stck with
    stcke" which writes 16 bytes instead of 8 bytes into the stack frame. These
    additional 8 bytes however were indeed used by the caller (glibc) to save
    data and therefore this data was corrupted by the vdso code.
    Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
    9b2efe03
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