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ld.so.8: wfix 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2016-09-11 11:27:03 +01:00
parent 5a7b21d60d
commit 9a741b5b7c
1 changed files with 17 additions and 17 deletions
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34
man8/ld.so.8
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@ -209,7 +209,7 @@ A nonzero value may have been set by a Linux Security Module.
.SS Environment variables .SS Environment variables
Among the more important environment variables are the following: Among the more important environment variables are the following:
.TP .TP
.BR LD_ASSUME_KERNEL " (glibc since 2.2.3)" .BR LD_ASSUME_KERNEL " (since glibc 2.2.3)"
Each shared object can inform the dynamic linker of the minimum kernel ABI Each shared object can inform the dynamic linker of the minimum kernel ABI
version that it requires. version that it requires.
(This requirement is encoded in an ELF note section that is viewable via (This requirement is encoded in an ELF note section that is viewable via
@ -251,7 +251,7 @@ LinuxThreads and NPTL
see see
.BR pthreads (7). .BR pthreads (7).
.TP .TP
.BR LD_BIND_NOW " (glibc since 2.1.1)" .BR LD_BIND_NOW " (since glibc 2.1.1)"
If set to a nonempty string, If set to a nonempty string,
causes the dynamic linker to resolve all symbols causes the dynamic linker to resolve all symbols
at program startup instead of deferring function call resolution to the point at program startup instead of deferring function call resolution to the point
@ -329,7 +329,7 @@ instead of running normally.
Then there are lots of more or less obscure variables, Then there are lots of more or less obscure variables,
many obsolete or only for internal use. many obsolete or only for internal use.
.TP .TP
.BR LD_AUDIT " (glibc since 2.4)" .BR LD_AUDIT " (since glibc 2.4)"
A colon-separated list of user-specified, ELF shared objects A colon-separated list of user-specified, ELF shared objects
to be loaded before all others in a separate linker namespace to be loaded before all others in a separate linker namespace
(i.e., one that does not intrude upon the normal symbol bindings that (i.e., one that does not intrude upon the normal symbol bindings that
@ -351,12 +351,12 @@ as described in its
in the chapter in the chapter
.IR "Runtime Linker Auditing Interface" . .IR "Runtime Linker Auditing Interface" .
.TP .TP
.BR LD_BIND_NOT " (glibc since 2.1.95)" .BR LD_BIND_NOT " (since glibc 2.1.95)"
If this environment variable is set to a nonempty string, If this environment variable is set to a nonempty string,
do not update the GOT (global offset table) and PLT (procedure linkage table) do not update the GOT (global offset table) and PLT (procedure linkage table)
after resolving a symbol. after resolving a symbol.
.TP .TP
.BR LD_DEBUG " (glibc since 2.1)" .BR LD_DEBUG " (since glibc 2.1)"
Output verbose debugging information about the dynamic linker. Output verbose debugging information about the dynamic linker.
If set to If set to
.BR all , .BR all ,
@ -408,7 +408,7 @@ is ignored in secure-execution mode, unless the file
.IR /etc/suid\-debug .IR /etc/suid\-debug
exists (the content of the file is irrelevant). exists (the content of the file is irrelevant).
.TP .TP
.BR LD_DEBUG_OUTPUT " (glibc since 2.1)" .BR LD_DEBUG_OUTPUT " (since glibc 2.1)"
File in which File in which
.B LD_DEBUG .B LD_DEBUG
output should be written. output should be written.
@ -416,7 +416,7 @@ The default is standard error.
.B LD_DEBUG_OUTPUT .B LD_DEBUG_OUTPUT
is ignored in secure-execution mode. is ignored in secure-execution mode.
.TP .TP
.BR LD_DYNAMIC_WEAK " (glibc since 2.1.91)" .BR LD_DYNAMIC_WEAK " (since glibc 2.1.91)"
If this environment variable is defined (with any value), If this environment variable is defined (with any value),
allow weak symbols to be overridden (reverting to old glibc behavior). allow weak symbols to be overridden (reverting to old glibc behavior).
.\" See weak handling .\" See weak handling
@ -430,10 +430,10 @@ Since glibc 2.3.4,
.B LD_DYNAMIC_WEAK .B LD_DYNAMIC_WEAK
is ignored in secure-execution mode. is ignored in secure-execution mode.
.TP .TP
.BR LD_HWCAP_MASK " (glibc since 2.1)" .BR LD_HWCAP_MASK " (since glibc 2.1)"
Mask for hardware capabilities. Mask for hardware capabilities.
.TP .TP
.BR LD_ORIGIN_PATH " (glibc since 2.1)" .BR LD_ORIGIN_PATH " (since glibc 2.1)"
Path where the binary is found. Path where the binary is found.
Since glibc 2.4, Since glibc 2.4,
.B LD_ORIGIN_PATH .B LD_ORIGIN_PATH
@ -457,13 +457,13 @@ Since glibc 2.23,
can no longer be used to disable pointer guarding, can no longer be used to disable pointer guarding,
which is now always enabled. which is now always enabled.
.TP .TP
.BR LD_PROFILE " (glibc since 2.1)" .BR LD_PROFILE " (since glibc 2.1)"
The name of a (single) shared object to be profiled, The name of a (single) shared object to be profiled,
specified either as a pathname or a soname. specified either as a pathname or a soname.
Profiling output is appended to the file whose name is: Profiling output is appended to the file whose name is:
"\fI$LD_PROFILE_OUTPUT\fP/\fI$LD_PROFILE\fP.profile". "\fI$LD_PROFILE_OUTPUT\fP/\fI$LD_PROFILE\fP.profile".
.TP .TP
.BR LD_PROFILE_OUTPUT " (glibc since 2.1)" .BR LD_PROFILE_OUTPUT " (since glibc 2.1)"
Directory where Directory where
.B LD_PROFILE .B LD_PROFILE
output should be written. output should be written.
@ -475,7 +475,7 @@ is ignored in secure-execution mode; instead
.IR /var/profile .IR /var/profile
is always used. is always used.
.TP .TP
.BR LD_SHOW_AUXV " (glibc since 2.1)" .BR LD_SHOW_AUXV " (since glibc 2.1)"
If this environment variable is defined (with any value), If this environment variable is defined (with any value),
show the auxiliary array passed up from the kernel (see also show the auxiliary array passed up from the kernel (see also
.BR getauxval (3)). .BR getauxval (3)).
@ -483,7 +483,7 @@ Since glibc 2.3.5,
.B LD_SHOW_AUXV .B LD_SHOW_AUXV
is ignored in secure-execution mode. is ignored in secure-execution mode.
.TP .TP
.BR LD_TRACE_PRELINKING " (glibc since 2.4)" .BR LD_TRACE_PRELINKING " (since glibc 2.4)"
If this environment variable is defined (with any value), If this environment variable is defined (with any value),
trace prelinking of the object whose name is assigned to trace prelinking of the object whose name is assigned to
this environment variable. this environment variable.
@ -494,7 +494,7 @@ If the object name is not recognized,
.\" (This is what seems to happen, from experimenting) .\" (This is what seems to happen, from experimenting)
then all prelinking activity is traced. then all prelinking activity is traced.
.TP .TP
.BR LD_USE_LOAD_BIAS " (glibc since 2.3.3)" .BR LD_USE_LOAD_BIAS " (since glibc 2.3.3)"
.\" http://sources.redhat.com/ml/libc-hacker/2003-11/msg00127.html .\" http://sources.redhat.com/ml/libc-hacker/2003-11/msg00127.html
.\" Subject: [PATCH] Support LD_USE_LOAD_BIAS .\" Subject: [PATCH] Support LD_USE_LOAD_BIAS
.\" Jakub Jelinek .\" Jakub Jelinek
@ -513,17 +513,17 @@ is defined with the value 0,
neither executables nor PIEs will honor the base addresses. neither executables nor PIEs will honor the base addresses.
This variable is ignored in secure-execution mode. This variable is ignored in secure-execution mode.
.TP .TP
.BR LD_VERBOSE " (glibc since 2.1)" .BR LD_VERBOSE " (since glibc 2.1)"
If set to a nonempty string, If set to a nonempty string,
output symbol versioning information about the output symbol versioning information about the
program if the program if the
.B LD_TRACE_LOADED_OBJECTS .B LD_TRACE_LOADED_OBJECTS
environment variable has been set. environment variable has been set.
.TP .TP
.BR LD_WARN " (ELF only; glibc since 2.1.3) .BR LD_WARN " (ELF only; since glibc 2.1.3)
If set to a nonempty string, warn about unresolved symbols. If set to a nonempty string, warn about unresolved symbols.
.TP .TP
.BR LD_PREFER_MAP_32BIT_EXEC " (x86-64 only; glibc since 2.23)" .BR LD_PREFER_MAP_32BIT_EXEC " (x86-64 only; since glibc 2.23)"
According to the Intel Silvermont software optimization guide, for 64-bit According to the Intel Silvermont software optimization guide, for 64-bit
applications, branch prediction performance can be negatively impacted applications, branch prediction performance can be negatively impacted
when the target of a branch is more than 4GB away from the branch. when the target of a branch is more than 4GB away from the branch.