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kpatch-build: support patching weak function 

Before this patch, if changed function is weak symbol, it is not
be allowed to create live patch, and it will trigger the following
error:
/usr/local/libexec/kpatch/create-diff-object: ERROR: ***.o:
kpatch_create_patches_sections: 2294: lookup_global_symbol ***

And if the changed function reference the weak symbol, when loading
the patch module will trigger the following error:
module kpatch-***: overflow in relocation type *** val 0
insmod: can't insert 'kpatch-***.ko': invalid module format

This patch fix it and add support for patching weak function.

Signed-off-by: Li Bin <huawei.libin@huawei.com>
This commit is contained in:
Li Bin 2015-10-16 10:36:16 +08:00
parent c8b0f18aa9
commit 724cac2e36
1 changed files with 1 additions and 1 deletions
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kpatch-build/lookup.c
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@ -185,7 +185,7 @@ int lookup_global_symbol(struct lookup_table *table, char *name,
memset(result, 0, sizeof(*result)); memset(result, 0, sizeof(*result));
for_each_symbol(i, sym, table) for_each_symbol(i, sym, table)
if (!sym->skip && sym->bind == STB_GLOBAL && if (!sym->skip && (sym->bind == STB_GLOBAL || sym->bind == STB_WEAK) &&
!strcmp(sym->name, name)) { !strcmp(sym->name, name)) {
result->value = sym->value; result->value = sym->value;
result->size = sym->size; result->size = sym->size;