From 5ad75fcdd712d18b393c3b3fe52ab4108703d337 Mon Sep 17 00:00:00 2001 From: Jessica Yu Date: Wed, 17 Aug 2016 20:58:30 -0400 Subject: [PATCH] Documentation: livepatch: add section about arch-specific code Document usage of arch-specific elf sections in livepatch as well as implementation of arch-specific code. [jkosina@suse.cz: fix wording as suggested by Petr Mladek] Signed-off-by: Jessica Yu Reviewed-by: Petr Mladek Signed-off-by: Jiri Kosina --- Documentation/livepatch/module-elf-format.txt | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/Documentation/livepatch/module-elf-format.txt b/Documentation/livepatch/module-elf-format.txt index eedbdcf..f21a528 100644 --- a/Documentation/livepatch/module-elf-format.txt +++ b/Documentation/livepatch/module-elf-format.txt @@ -25,7 +25,8 @@ Table of Contents 3.3.2 Required name format 3.3.3 Example livepatch symbol names 3.3.4 Example `readelf --symbols` output -4. Symbol table and Elf section access +4. Architecture-specific sections +5. Symbol table and Elf section access ---------------------------- 0. Background and motivation @@ -46,7 +47,7 @@ architecture. Since apply_relocate_add() requires access to a module's section header table, symbol table, and relocation section indices, Elf information is -preserved for livepatch modules (see section 4). Livepatch manages its own +preserved for livepatch modules (see section 5). Livepatch manages its own relocation sections and symbols, which are described in this document. The Elf constants used to mark livepatch symbols and relocation sections were selected from OS-specific ranges according to the definitions from glibc. @@ -117,7 +118,7 @@ also possible for a livepatch module to have no livepatch relocation sections, as in the case of the sample livepatch module (see samples/livepatch). -Since Elf information is preserved for livepatch modules (see Section 4), a +Since Elf information is preserved for livepatch modules (see Section 5), a livepatch relocation section can be applied simply by passing in the appropriate section index to apply_relocate_add(), which then uses it to access the relocation section and apply the relocations. @@ -292,8 +293,19 @@ Symbol table '.symtab' contains 127 entries: [*] Note that the 'Ndx' (Section index) for these symbols is SHN_LIVEPATCH (0xff20). "OS" means OS-specific. +--------------------------------- +4. Architecture-specific sections +--------------------------------- +Architectures may override arch_klp_init_object_loaded() to perform +additional arch-specific tasks when a target module loads, such as applying +arch-specific sections. On x86 for example, we must apply per-object +.altinstructions and .parainstructions sections when a target module loads. +These sections must be prefixed with ".klp.arch.$objname." so that they can +be easily identified when iterating through a patch module's Elf sections +(See arch/x86/kernel/livepatch.c for a complete example). + -------------------------------------- -4. Symbol table and Elf section access +5. Symbol table and Elf section access -------------------------------------- A livepatch module's symbol table is accessible through module->symtab. -- 2.7.4