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libbpf: Improve library identification for uprobe binary path resolution 

In the process of doing path resolution for uprobe attach, libraries are
identified by matching a ".so" substring in the binary_path.
This matches a lot of patterns that do not conform to library.so[.version]
format, so instead match a ".so" _suffix_, and if that fails match a
".so." substring for the versioned library case.

Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1649245431-29956-2-git-send-email-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire 2022-04-06 12:43:49 +01:00 committed by Andrii Nakryiko
parent 9fc4476a08
commit a1c9d61b19
2 changed files with 12 additions and 1 deletions
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2
tools/lib/bpf/libbpf.c
View File

@ -10766,7 +10766,7 @@ static int resolve_full_path(const char *file, char *result, size_t result_sz)
const char *search_paths[3] = {};
int i;
if (strstr(file, ".so")) {
if (str_has_sfx(file, ".so") || strstr(file, ".so.")) {
search_paths[0] = getenv("LD_LIBRARY_PATH");
search_paths[1] = "/usr/lib64:/usr/lib";
search_paths[2] = arch_specific_lib_paths();

11
tools/lib/bpf/libbpf_internal.h
View File

@ -103,6 +103,17 @@
#define str_has_pfx(str, pfx) \
(strncmp(str, pfx, __builtin_constant_p(pfx) ? sizeof(pfx) - 1 : strlen(pfx)) == 0)
/* suffix check */
static inline bool str_has_sfx(const char *str, const char *sfx)
{
size_t str_len = strlen(str);
size_t sfx_len = strlen(sfx);
if (sfx_len <= str_len)
return strcmp(str + str_len - sfx_len, sfx);
return false;
}
/* Symbol versioning is different between static and shared library.
* Properly versioned symbols are needed for shared library, but
* only the symbol of the new version is needed for static library.