Subject: + fs-kernel-permit-disabling-the-uselib-syscall.patch added to -mm tree
To: josh@xxxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Fri, 21 Feb 2014 12:17:13 -0800
The patch titled
Subject: fs, kernel: permit disabling the uselib syscall
has been added to the -mm tree. Its filename is
fs-kernel-permit-disabling-the-uselib-syscall.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fs-kernel-permit-disabling-the-uselib-syscall.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fs-kernel-permit-disabling-the-uselib-syscall.patch
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------------------------------------------------------
From: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
Subject: fs, kernel: permit disabling the uselib syscall
uselib hasn't been used since libc5; glibc does not use it. Support
turning it off.
When disabled, also omit the load_elf_library implementation from
binfmt_elf.c, which only uselib invokes.
bloat-o-meter:
add/remove: 0/4 grow/shrink: 0/1 up/down: 0/-785 (-785)
function old new delta
padzero 39 36 -3
uselib_flags 20 - -20
sys_uselib 168 - -168
SyS_uselib 168 - -168
load_elf_library 426 - -426
Signed-off-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/binfmt_elf.c | 9 ++++++++-
fs/exec.c | 2 ++
init/Kconfig | 9 +++++++++
kernel/sys_ni.c | 1 +
4 files changed, 20 insertions(+), 1 deletion(-)
diff -puN fs/binfmt_elf.c~fs-kernel-permit-disabling-the-uselib-syscall fs/binfmt_elf.c
--- a/fs/binfmt_elf.c~fs-kernel-permit-disabling-the-uselib-syscall
+++ a/fs/binfmt_elf.c
@@ -46,10 +46,15 @@
#endif
static int load_elf_binary(struct linux_binprm *bprm);
-static int load_elf_library(struct file *);
static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
int, int, unsigned long);
+#ifdef CONFIG_USELIB
+static int load_elf_library(struct file *);
+#else
+#define load_elf_library NULL
+#endif
+
/*
* If we don't support core dumping, then supply a NULL so we
* don't even try.
@@ -1005,6 +1010,7 @@ out_free_ph:
goto out;
}
+#ifdef CONFIG_USELIB
/* This is really simpleminded and specialized - we are loading an
a.out library that is given an ELF header. */
static int load_elf_library(struct file *file)
@@ -1083,6 +1089,7 @@ out_free_ph:
out:
return error;
}
+#endif /* #ifdef CONFIG_USELIB */
#ifdef CONFIG_ELF_CORE
/*
diff -puN fs/exec.c~fs-kernel-permit-disabling-the-uselib-syscall fs/exec.c
--- a/fs/exec.c~fs-kernel-permit-disabling-the-uselib-syscall
+++ a/fs/exec.c
@@ -97,6 +97,7 @@ static inline void put_binfmt(struct lin
module_put(fmt->module);
}
+#ifdef CONFIG_USELIB
/*
* Note that a shared library must be both readable and executable due to
* security reasons.
@@ -156,6 +157,7 @@ exit:
out:
return error;
}
+#endif /* #ifdef CONFIG_USELIB */
#ifdef CONFIG_MMU
/*
diff -puN init/Kconfig~fs-kernel-permit-disabling-the-uselib-syscall init/Kconfig
--- a/init/Kconfig~fs-kernel-permit-disabling-the-uselib-syscall
+++ a/init/Kconfig
@@ -273,6 +273,15 @@ config FHANDLE
get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2)
syscalls.
+config USELIB
+ bool "uselib syscall"
+ help
+ This option enables the uselib syscall, a system call used in the
+ dynamic linker from libc5 and earlier. glibc does not use this
+ system call. If you intend to run programs built on libc5 or
+ earlier, you may need to enable this syscall. Current systems
+ running glibc can safely disable this.
+
config AUDIT
bool "Auditing support"
depends on NET
diff -puN kernel/sys_ni.c~fs-kernel-permit-disabling-the-uselib-syscall kernel/sys_ni.c
--- a/kernel/sys_ni.c~fs-kernel-permit-disabling-the-uselib-syscall
+++ a/kernel/sys_ni.c
@@ -152,6 +152,7 @@ cond_syscall(sys_process_vm_readv);
cond_syscall(sys_process_vm_writev);
cond_syscall(compat_sys_process_vm_readv);
cond_syscall(compat_sys_process_vm_writev);
+cond_syscall(sys_uselib);
/* arch-specific weak syscall entries */
cond_syscall(sys_pciconfig_read);
_
Patches currently in -mm which might be from josh@xxxxxxxxxxxxxxxx are
mm-compactionc-mark-function-as-static.patch
mm-memoryc-mark-functions-as-static.patch
mm-mmapc-mark-function-as-static.patch
mm-process_vm_accessc-mark-function-as-static.patch
mm-page_cgroupc-mark-functions-as-static.patch
mm-nobootmemc-mark-function-as-static.patch
include-linux-mmh-remove-ifdef-condition.patch
include-linux-syscallsh-add-sys32_quotactl-prototype.patch
fs-kernel-permit-disabling-the-uselib-syscall.patch
fs-reiserfs-move-prototype-declaration-to-header-file.patch
include-linux-crash_dumph-add-vmcore_cleanup-prototype.patch
include-linux-crash_dumph-add-vmcore_cleanup-prototype-fix.patch
linux-next.patch
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