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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-06 17:25:45 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-11-21 16:15:42 -0300 |
| commit | 4a133885a7c8ae7ebe34e36fcdb353f8e94c810f (patch) | |
| tree | 3e7b0282fa619485f4a6f3873457e112b735962b /elf/rtld.c | |
| parent | 1c87f71a36e21fa851117c151b3c492fa3eede5b (diff) | |
| download | glibc-4a133885a7c8ae7ebe34e36fcdb353f8e94c810f.tar.gz glibc-4a133885a7c8ae7ebe34e36fcdb353f8e94c810f.tar.xz glibc-4a133885a7c8ae7ebe34e36fcdb353f8e94c810f.zip | |
elf: Ignore LD_PROFILE for setuid binaries
Loader does not ignore LD_PROFILE in secure-execution mode (different than man-page states [1]), rather it uses a different path (/var/profile) and ignore LD_PROFILE_OUTPUT. Allowing secure-execution profiling is already a non good security boundary, since it enables different code paths and extra OS access by the process. But by ignoring LD_PROFILE_OUTPUT, the resulting profile file might also be acceded in a racy manner since the file name does not use any process-specific information (such as pid, timing, etc.). Another side-effect is it forces lazy binding even on libraries that might be with DF_BIND_NOW. [1] https://man7.org/linux/man-pages/man8/ld.so.8.html Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'elf/rtld.c')
| -rw-r--r-- | elf/rtld.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/elf/rtld.c b/elf/rtld.c index 51b6d9f326..a09cf2a9df 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -361,6 +361,7 @@ struct rtld_global_ro _rtld_global_ro attribute_relro = ._dl_fpu_control = _FPU_DEFAULT, ._dl_pagesize = EXEC_PAGESIZE, ._dl_inhibit_cache = 0, + ._dl_profile_output = "/var/tmp", /* Function pointers. */ ._dl_debug_printf = _dl_debug_printf, @@ -2534,10 +2535,6 @@ process_envvars (struct dl_main_state *state) char *envline; char *debug_output = NULL; - /* This is the default place for profiling data file. */ - GLRO(dl_profile_output) - = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0]; - while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) { size_t len = 0; @@ -2586,7 +2583,8 @@ process_envvars (struct dl_main_state *state) } /* Which shared object shall be profiled. */ - if (memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') + if (!__libc_enable_secure + && memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') GLRO(dl_profile) = &envline[8]; break; |