426f57383d
Defining a new function with the same name as a previously defined function causes the grub_script and associated resources for the previous function to be freed. If the previous function is currently executing when a function with the same name is defined, this results in use-after-frees when processing subsequent commands in the original function. Instead, reject a new function definition if it has the same name as a previously defined function, and that function is currently being executed. Although a behavioural change, this should be backwards compatible with existing configurations because they can't be dependent on the current behaviour without being broken. Fixes: CVE-2020-15706 Signed-off-by: Chris Coulson <chris.coulson@canonical.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> |
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| .. | ||
| grub | ||
| xen | ||
| multiboot.h | ||
| multiboot2.h | ||