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Code Editor : CVE-2025-4802.patch
[Ubuntu: backport for version 2.35] From 5451fa962cd0a90a0e2ec1d8910a559ace02bba0 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Mon, 6 Nov 2023 17:25:49 -0300 Subject: [PATCH] elf: Ignore LD_LIBRARY_PATH and debug env var for setuid for static It mimics the ld.so behavior. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org> --- elf/dl-support.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) --- glibc-2.35.orig/elf/dl-support.c +++ glibc-2.35/elf/dl-support.c @@ -339,8 +339,6 @@ _dl_non_dynamic_init (void) _dl_main_map.l_phdr = GL(dl_phdr); _dl_main_map.l_phnum = GL(dl_phnum); - _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1; - /* Set up the data structures for the system-supplied DSO early, so they can influence _dl_init_paths. */ setup_vdso (NULL, NULL); @@ -348,6 +346,30 @@ _dl_non_dynamic_init (void) /* With vDSO setup we can initialize the function pointers. */ setup_vdso_pointers (); + if (__libc_enable_secure) + { + static const char unsecure_envvars[] = + UNSECURE_ENVVARS +#ifdef EXTRA_UNSECURE_ENVVARS + EXTRA_UNSECURE_ENVVARS +#endif + ; + const char *cp = unsecure_envvars; + + while (cp < unsecure_envvars + sizeof (unsecure_envvars)) + { + __unsetenv (cp); + cp = (const char *) __rawmemchr (cp, '\0') + 1; + } + +#if !HAVE_TUNABLES + if (__access ("/etc/suid-debug", F_OK) != 0) + __unsetenv ("MALLOC_CHECK_"); +#endif + } + + _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1; + /* Initialize the data structures for the search paths for shared objects. */ _dl_init_paths (getenv ("LD_LIBRARY_PATH"), "LD_LIBRARY_PATH", @@ -369,28 +391,6 @@ _dl_non_dynamic_init (void) _dl_profile_output = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0]; - if (__libc_enable_secure) - { - static const char unsecure_envvars[] = - UNSECURE_ENVVARS -#ifdef EXTRA_UNSECURE_ENVVARS - EXTRA_UNSECURE_ENVVARS -#endif - ; - const char *cp = unsecure_envvars; - - while (cp < unsecure_envvars + sizeof (unsecure_envvars)) - { - __unsetenv (cp); - cp = (const char *) __rawmemchr (cp, '\0') + 1; - } - -#if !HAVE_TUNABLES - if (__access ("/etc/suid-debug", F_OK) != 0) - __unsetenv ("MALLOC_CHECK_"); -#endif - } - #ifdef DL_PLATFORM_INIT DL_PLATFORM_INIT; #endif
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