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Workaround dl_iterate_phdr problems.

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The code now performs a dry run of a dl_iterate_phdr call, storing the results
in a vector. Then, the original processing loop is issued, but outside of
dl_iterate_phdr.

For possible cause of problems see:
https://github.com/libunwind/libunwind/issues/16
This commit is contained in:
Bartosz Taudul 2022-04-30 23:15:16 +02:00
parent 4559120821
commit 7e8961d2fc
No known key found for this signature in database
GPG Key ID: B7FE2008B7575DF3
1 changed files with 30 additions and 3 deletions
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33
libbacktrace/elf.cpp
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@ -46,6 +46,9 @@ POSSIBILITY OF SUCH DAMAGE. */
#include "backtrace.hpp"
#include "internal.hpp"
#include "../client/TracyFastVector.hpp"
#include "../common/TracyAlloc.hpp"
#ifndef S_ISLNK
#ifndef S_IFLNK
#define S_IFLNK 0120000
@ -4823,12 +4826,33 @@ struct phdr_data
/* Callback passed to dl_iterate_phdr. Load debug info from shared
libraries. */
struct PhdrIterate
{
char* dlpi_name;
ElfW(Addr) dlpi_addr;
};
FastVector<PhdrIterate> s_phdrData(16);
static int
phdr_callback_mock (struct dl_phdr_info *info, size_t size ATTRIBUTE_UNUSED,
void *pdata)
{
auto ptr = s_phdrData.push_next();
if (info->dlpi_name)
{
ptr->dlpi_name = (char*)tracy_malloc (strlen (info->dlpi_name) + 1);
strcpy (ptr->dlpi_name, info->dlpi_name);
}
else ptr->dlpi_name = nullptr;
ptr->dlpi_addr = info->dlpi_addr;
return 0;
}
static int
#ifdef __i386__
__attribute__ ((__force_align_arg_pointer__))
#endif
phdr_callback (struct dl_phdr_info *info, size_t size ATTRIBUTE_UNUSED,
void *pdata)
phdr_callback (struct PhdrIterate *info, void *pdata)
{
struct phdr_data *pd = (struct phdr_data *) pdata;
const char *filename;
@ -4907,7 +4931,10 @@ backtrace_initialize (struct backtrace_state *state, const char *filename,
pd.exe_filename = filename;
pd.exe_descriptor = ret < 0 ? descriptor : -1;
dl_iterate_phdr (phdr_callback, (void *) &pd);
for (auto& v : s_phdrData) tracy_free (v.dlpi_name);
s_phdrData.clear();
dl_iterate_phdr (phdr_callback_mock, nullptr);
for (auto& v : s_phdrData) phdr_callback (&v, (void *) &pd);
if (!state->threaded)
{