mgalgs
/ hacking-your-ELF-for-fun-and-profit.c
Last active
August 27, 2020 09:49
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| #define __define_initcall(level,fn,id) \ | |
| static initcall_t __initcall_##fn##id __used \ | |
| __attribute__((__section__(".initcall" level ".init"))) = fn | |
| #define core_initcall(fn) __define_initcall("1",fn,1) | |
| #define subsys_initcall(fn) __define_initcall("4",fn,4) | |
| #define late_initcall(fn) __define_initcall("7",fn,7) | |
| /* trimmed, obviously... */ |
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| static void __init do_initcalls(void) | |
| { | |
| int level; | |
| for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) | |
| do_initcall_level(level); | |
| } |
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| #include "section_hacking.h" | |
| static void in_equotes(const char *txt) | |
| { | |
| printf("`%s'\n", txt); | |
| } | |
| REGISTER_FORMATTER(in_equotes); |
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| #include "section_hacking.h" | |
| static void in_equotes(const char *txt) | |
| { | |
| printf("`%s'\n", txt); | |
| } | |
| REGISTER_FORMATTER(in_equotes); |
mgalgs
/ section_hacking.c
Created
May 10, 2013 21:05
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| #include "section_hacking.h" | |
| extern struct formatter_info __start_my_formatters; | |
| extern struct formatter_info __stop_my_formatters; | |
| static void format_all(const char *txt) | |
| { | |
| struct formatter_info *iter = &__start_my_formatters; | |
| for ( ; iter < &__stop_my_formatters; ++iter) { |
mgalgs
/ section_hacking.c
Created
May 10, 2013 21:05
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| #include "section_hacking.h" | |
| extern struct formatter_info __start_my_formatters; | |
| extern struct formatter_info __stop_my_formatters; | |
| static void format_all(const char *txt) | |
| { | |
| struct formatter_info *iter = &__start_my_formatters; | |
| for ( ; iter < &__stop_my_formatters; ++iter) { |
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| static void __init do_initcall_level(int level) | |
| { | |
| extern const struct kernel_param __start___param[], __stop___param[]; | |
| initcall_t *fn; | |
| strcpy(static_command_line, saved_command_line); | |
| parse_args(initcall_level_names[level], | |
| static_command_line, __start___param, | |
| __stop___param - __start___param, | |
| level, level, |
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| int __init_or_module do_one_initcall(initcall_t fn) | |
| { | |
| int count = preempt_count(); | |
| int ret; | |
| /* ... */ | |
| ret = fn(); | |
| /* ... */ | |
| return ret; |
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| static void __init do_initcall_level(int level) | |
| { | |
| initcall_t *fn; | |
| /* ... */ | |
| for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) | |
| do_one_initcall(*fn); | |
| } |
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| static initcall_t *initcall_levels[] __initdata = { | |
| __initcall0_start, | |
| __initcall1_start, | |
| __initcall2_start, | |
| __initcall3_start, | |
| __initcall4_start, | |
| __initcall5_start, | |
| __initcall6_start, | |
| __initcall7_start, | |
| __initcall_end, |