aboutsummaryrefslogtreecommitdiff
path: root/manual
diff options
context:
space:
mode:
authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2023-11-06 17:25:34 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2023-11-21 16:15:42 -0300
commit6c6fce572fb8f583f14d898e54fd7d25ae91cf56 (patch)
tree9a1d21fc312c89083843f6349bf96499cb35e08c /manual
parent64e4acf24da15c11cb83f933947df3b2e8a700cd (diff)
downloadglibc-6c6fce572fb8f583f14d898e54fd7d25ae91cf56.zip
glibc-6c6fce572fb8f583f14d898e54fd7d25ae91cf56.tar.gz
glibc-6c6fce572fb8f583f14d898e54fd7d25ae91cf56.tar.bz2
elf: Remove /etc/suid-debug support
Since malloc debug support moved to a different library (libc_malloc_debug.so), the glibc.malloc.check requires preloading the debug library to enable it. It means that suid-debug support has not been working since 2.34. To restore its support, it would require to add additional information and parsing to where to find libc_malloc_debug.so. It is one thing less that might change AT_SECURE binaries' behavior due to environment configurations. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'manual')
-rw-r--r--manual/memory.texi4
-rw-r--r--manual/tunables.texi4
2 files changed, 2 insertions, 6 deletions
diff --git a/manual/memory.texi b/manual/memory.texi
index 5781a64..258fdbd 100644
--- a/manual/memory.texi
+++ b/manual/memory.texi
@@ -1379,9 +1379,7 @@ There is one problem with @code{MALLOC_CHECK_}: in SUID or SGID binaries
it could possibly be exploited since diverging from the normal programs
behavior it now writes something to the standard error descriptor.
Therefore the use of @code{MALLOC_CHECK_} is disabled by default for
-SUID and SGID binaries. It can be enabled again by the system
-administrator by adding a file @file{/etc/suid-debug} (the content is
-not important it could be empty).
+SUID and SGID binaries.
So, what's the difference between using @code{MALLOC_CHECK_} and linking
with @samp{-lmcheck}? @code{MALLOC_CHECK_} is orthogonal with respect to
diff --git a/manual/tunables.texi b/manual/tunables.texi
index 5549f70..b31f16d 100644
--- a/manual/tunables.texi
+++ b/manual/tunables.texi
@@ -136,9 +136,7 @@ termination of the process.
Like @env{MALLOC_CHECK_}, @code{glibc.malloc.check} has a problem in that it
diverges from normal program behavior by writing to @code{stderr}, which could
by exploited in SUID and SGID binaries. Therefore, @code{glibc.malloc.check}
-is disabled by default for SUID and SGID binaries. This can be enabled again
-by the system administrator by adding a file @file{/etc/suid-debug}; the
-content of the file could be anything or even empty.
+is disabled by default for SUID and SGID binaries.
@end deftp
@deftp Tunable glibc.malloc.top_pad