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H A D | efi_stub_32.S | 57648adb Sun Mar 08 03:08:52 CDT 2020 Ard Biesheuvel <ardb@kernel.org> efi/x86: Preserve %ebx correctly in efi_set_virtual_address_map()
Commit:
59f2a619a2db8611 ("efi: Add 'runtime' pointer to struct efi")
modified the assembler routine called by efi_set_virtual_address_map(), to grab the 'runtime' EFI service pointer while running with paging disabled (which is tricky to do in C code)
After the change, register %ebx is not restored correctly, resulting in all kinds of weird behavior, so fix that.
Reported-by: Guenter Roeck <linux@roeck-us.net> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20200304133515.15035-1-ardb@kernel.org Link: https://lore.kernel.org/r/20200308080859.21568-22-ardb@kernel.org 57648adb Sun Mar 08 03:08:52 CDT 2020 Ard Biesheuvel <ardb@kernel.org> efi/x86: Preserve %ebx correctly in efi_set_virtual_address_map() Commit: 59f2a619a2db8611 ("efi: Add 'runtime' pointer to struct efi") modified the assembler routine called by efi_set_virtual_address_map(), to grab the 'runtime' EFI service pointer while running with paging disabled (which is tricky to do in C code) After the change, register %ebx is not restored correctly, resulting in all kinds of weird behavior, so fix that. Reported-by: Guenter Roeck <linux@roeck-us.net> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20200304133515.15035-1-ardb@kernel.org Link: https://lore.kernel.org/r/20200308080859.21568-22-ardb@kernel.org
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