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kallsyms: store type information in its own array

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When a module is loaded, its symbols' Elf_Sym information is stored
in a symtab.  Further, type information is also captured.  Since
Elf_Sym has no type field, historically the st_info field has been
hijacked for storing type:  st_info was overwritten.

commit 5439c985c5 ("module: Overwrite
st_size instead of st_info") changes that practice, as its one-liner
indicates.  Unfortunately, this change overwrites symbol size,
information that a tool like DTrace expects to find.

Allocate a typetab array to store type information so that no Elf_Sym
field needs to be overwritten.

Fixes: 5439c985c5 ("module: Overwrite st_size instead of st_info")
Signed-off-by: Eugene Loh <eugene.loh@oracle.com>
Reviewed-by: Nick Alcock <nick.alcock@oracle.com>
[jeyu: renamed typeoff -> typeoffs ]
Signed-off-by: Jessica Yu <jeyu@kernel.org>
This commit is contained in:
Eugene Loh
2019-02-25 11:59:58 -08:00
committed by Jessica Yu
parent 9672e2cb0f
commit 1c7651f437
3 changed files with 16 additions and 8 deletions
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2
kernel/module-internal.h
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@@ -20,7 +20,7 @@ struct load_info {
unsigned long len;
Elf_Shdr *sechdrs;
char *secstrings, *strtab;
unsigned long symoffs, stroffs;
unsigned long symoffs, stroffs, init_typeoffs, core_typeoffs;
struct _ddebug *debug;
unsigned int num_debug;
bool sig_ok;