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kallsyms, x86: Export addresses of PTI entry trampolines

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Currently, the addresses of PTI entry trampolines are not exported to
user space. Kernel profiling tools need these addresses to identify the
kernel code, so add a symbol and address for each CPU's PTI entry
trampoline.

Signed-off-by: Alexander Shishkin <[email protected]>
Acked-by: Andi Kleen <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Alexander Shishkin 2018-06-06 15:54:10 +03:00 • committed by Arnaldo Carvalho de Melo
commit d83212d5dd
2 changed files with 50 additions and 1 deletions
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28
kernel/kallsyms.c
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@ -432,6 +432,7 @@ int sprint_backtrace(char *buffer, unsigned long address)
/* To avoid using get_symbol_offset for every symbol, we carry prefix along. */
struct kallsym_iter {
loff_t pos;
loff_t pos_arch_end;
loff_t pos_mod_end;
loff_t pos_ftrace_mod_end;
unsigned long value;
@ -443,9 +444,29 @@ struct kallsym_iter {
int show_value;
};
int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value,
char *type, char *name)
{
return -EINVAL;
}
static int get_ksymbol_arch(struct kallsym_iter *iter)
{
int ret = arch_get_kallsym(iter->pos - kallsyms_num_syms,
&iter->value, &iter->type,
iter->name);
if (ret < 0) {
iter->pos_arch_end = iter->pos;
return 0;
}
return 1;
}
static int get_ksymbol_mod(struct kallsym_iter *iter)
{
int ret = module_get_kallsym(iter->pos - kallsyms_num_syms,
int ret = module_get_kallsym(iter->pos - iter->pos_arch_end,
&iter->value, &iter->type,
iter->name, iter->module_name,
&iter->exported);
@ -501,6 +522,7 @@ static void reset_iter(struct kallsym_iter *iter, loff_t new_pos)
iter->nameoff = get_symbol_offset(new_pos);
iter->pos = new_pos;
if (new_pos == 0) {
iter->pos_arch_end = 0;
iter->pos_mod_end = 0;
iter->pos_ftrace_mod_end = 0;
}
@ -515,6 +537,10 @@ static int update_iter_mod(struct kallsym_iter *iter, loff_t pos)
{
iter->pos = pos;
if ((!iter->pos_arch_end || iter->pos_arch_end > pos) &&
get_ksymbol_arch(iter))
return 1;
if ((!iter->pos_mod_end || iter->pos_mod_end > pos) &&
get_ksymbol_mod(iter))
return 1;