diff options
| -rw-r--r-- | NEWS | 7 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h | 3 |
2 files changed, 9 insertions, 1 deletions
diff --git a/NEWS b/NEWS index 9bbcfd137a..82b0baa5fa 100644 --- a/NEWS +++ b/NEWS @@ -28,6 +28,12 @@ Security related changes: (denial of service) in some Go applications compiled with gccgo. Reported by Andreas Schwab. (CVE-2016-6323) + CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC + environment variable during program execution after a security + transition, allowing local attackers to restrict the possible mapping + addresses for loaded libraries and thus bypass ASLR for a setuid + program. Reported by Marcin Kościelnicki. + The following bugs are resolved with this release: [19679] gcc-4.9.3 C++ exception handling broken due to unaligned stack @@ -49,6 +55,7 @@ The following bugs are resolved with this release: [21666] Avoid .symver on common symbols [22641] x86: Fix mis-merge of XSAVE ld.so trampoline selection [22715] x86-64: Properly align La_x86_64_retval to VEC_SIZE + [25204] Ignore LD_PREFER_MAP_32BIT_EXEC for SUID programs Version 2.23 diff --git a/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h b/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h index a759934fdd..b13bba65d2 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h +++ b/sysdeps/unix/sysv/linux/x86_64/64/dl-librecon.h @@ -31,7 +31,8 @@ environment variable, LD_PREFER_MAP_32BIT_EXEC. */ #define EXTRA_LD_ENVVARS \ case 21: \ - if (memcmp (envline, "PREFER_MAP_32BIT_EXEC", 21) == 0) \ + if (!__libc_enable_secure \ + && memcmp (envline, "PREFER_MAP_32BIT_EXEC", 21) == 0) \ GLRO(dl_x86_cpu_features).feature[index_Prefer_MAP_32BIT_EXEC] \ |= bit_Prefer_MAP_32BIT_EXEC; \ break; |