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[linux] Validate length of ACPI table read from sysfs

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Consumers of acpi_find() will assume that returned structures include
a valid table header and that the length in the table header is
correct.  These assumptions are necessary when dealing with raw ACPI
tables, since there exists no independent source of length
information.

Ensure that these assumptions are also valid for ACPI tables read from
sysfs.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2021-03-03 01:55:07 +00:00
parent 50d13907c4
commit 1c4917b6a7
2 changed files with 11 additions and 0 deletions
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src/include/ipxe/errfile.h
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@@ -389,6 +389,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define ERRFILE_efi_autoexec ( ERRFILE_OTHER | 0x00540000 )
#define ERRFILE_efi_cachedhcp ( ERRFILE_OTHER | 0x00550000 )
#define ERRFILE_linux_sysfs ( ERRFILE_OTHER | 0x00560000 )
#define ERRFILE_linux_acpi ( ERRFILE_OTHER | 0x00570000 )
/** @} */