Marc Hartmayer f4ed0b0ec6 zdump: check size before mmap'ing ...

Verify that the size is large enough before doing the mmap. Otherwise
this can result in a SIGBUS signal if there is an attempt to access a
page that lies beyond the end of the mapped file (see `man 2 mmap`).

Fixes: 8fa1b5a00b ("zdump: dfi: add support to read Protected Virtualization dumps")
Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2022-11-29 17:03:57 +01:00

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