diff options
Diffstat (limited to 'MdePkg/Library/StackCheckLib/Readme.md')
| -rw-r--r-- | MdePkg/Library/StackCheckLib/Readme.md | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/MdePkg/Library/StackCheckLib/Readme.md b/MdePkg/Library/StackCheckLib/Readme.md index 2d9bb6fbda..fe16084bd3 100644 --- a/MdePkg/Library/StackCheckLib/Readme.md +++ b/MdePkg/Library/StackCheckLib/Readme.md @@ -195,17 +195,12 @@ This will cause `MdeLibs.dsc.inc` to not link `StackCheckLibNull` and instead li stack cookie updating versions of `DxeCoreEntryPoint`, `StandaloneMmDriverEntryPoint`,
`UefiApplicationEntryPoint`, and `UefiDriverEntryPoint`.
-Because edk2 does not implement exception handling for `SEC` and `PEI_CORE`, `MdeLibs.dsc.inc`
-uses `StackCheckLibNull` for these phases always. As a result, dynamic stack cookies are also
-not set for `PEI_CORE`. There is no standard `SEC` entrypoint, so it is not supported generically
-to apply dynamic stack cookies there. If a platform wishes to use `StackCheckLib` and dynamic stack
-cookies for these phases, it should override this in its DSC, e.g.:
-
-```inf
-[LibraryClasses.common.SEC, LibraryClasses.common.PEI_CORE]
- StackCheckLib|MdePkg/Library/StackCheckLib/StackCheckLib.inf
- PeiCoreEntryPoint|MdePkg/Library/DynamicStackCookieEntryPointLib/PeiCoreEntryPoint.inf
-```
+Because edk2 does not implement exception handling for `SEC` and `PEI_CORE`,
+`MdeLibs.dsc.inc` uses `StackCheckLibNull` for these phases always. If a
+platform wishes to use `StackCheckLib` for these phases, it can enable static
+stack cookie checking, as documented in the previous section. Due to the fact
+that writable global variables are not supported in the `SEC` or `PEI` phases
+of execution, dynamic stack cookie checking is not supported here.
It is recommended that a platform only do this for debugging or if they have implemented
exception handlers for these phases.
|