diff options
Diffstat (limited to 'patches/source/glibc/glibc.3776f38f.diff')
| -rw-r--r-- | patches/source/glibc/glibc.3776f38f.diff | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/patches/source/glibc/glibc.3776f38f.diff b/patches/source/glibc/glibc.3776f38f.diff new file mode 100644 index 00000000..d2b787a4 --- /dev/null +++ b/patches/source/glibc/glibc.3776f38f.diff @@ -0,0 +1,52 @@ +From 3776f38fcd267c127ba5eb222e2c614c191744aa Mon Sep 17 00:00:00 2001 +From: Siddhesh Poyarekar <siddhesh@sourceware.org> +Date: Tue, 20 Jun 2017 05:59:17 +0200 +Subject: [PATCH] Ignore and remove LD_HWCAP_MASK for AT_SECURE programs (bug + #21209) + +The LD_HWCAP_MASK environment variable may alter the selection of +function variants for some architectures. For AT_SECURE process it +means that if an outdated routine has a bug that would otherwise not +affect newer platforms by default, LD_HWCAP_MASK will allow that bug +to be exploited. + +To be on the safe side, ignore and disable LD_HWCAP_MASK for setuid +binaries. + + [BZ #21209] + * elf/rtld.c (process_envvars): Ignore LD_HWCAP_MASK for + AT_SECURE processes. + * sysdeps/generic/unsecvars.h: Add LD_HWCAP_MASK. + +(cherry picked from commit 1c1243b6fc33c029488add276e56570a07803bfd) + +diff --git a/elf/rtld.c b/elf/rtld.c +index 369724b..9362a21 100644 +--- a/elf/rtld.c ++++ b/elf/rtld.c +@@ -2534,7 +2534,8 @@ process_envvars (enum mode *modep) + + case 10: + /* Mask for the important hardware capabilities. */ +- if (memcmp (envline, "HWCAP_MASK", 10) == 0) ++ if (!__libc_enable_secure ++ && memcmp (envline, "HWCAP_MASK", 10) == 0) + GLRO(dl_hwcap_mask) = __strtoul_internal (&envline[11], NULL, + 0, 0); + break; +diff --git a/sysdeps/generic/unsecvars.h b/sysdeps/generic/unsecvars.h +index a740837..5ea8a4a 100644 +--- a/sysdeps/generic/unsecvars.h ++++ b/sysdeps/generic/unsecvars.h +@@ -16,6 +16,7 @@ + "LD_DEBUG\0" \ + "LD_DEBUG_OUTPUT\0" \ + "LD_DYNAMIC_WEAK\0" \ ++ "LD_HWCAP_MASK\0" \ + "LD_LIBRARY_PATH\0" \ + "LD_ORIGIN_PATH\0" \ + "LD_PRELOAD\0" \ +-- +2.9.3 + + |