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authorKees Cook <kees@outflux.net>2007-05-08 03:26:04 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 14:15:02 -0400
commit5096add84b9e96e2e0a9c72675c442fe5433388a (patch)
treef0444013cb7db32596d2b6febafc1ee4c2a4ea1f /fs/proc/internal.h
parent4a1ccb5b1eff949a90ab830869cb23d6609c3d5f (diff)
proc: maps protection
The /proc/pid/ "maps", "smaps", and "numa_maps" files contain sensitive information about the memory location and usage of processes. Issues: - maps should not be world-readable, especially if programs expect any kind of ASLR protection from local attackers. - maps cannot just be 0400 because "-D_FORTIFY_SOURCE=2 -O2" makes glibc check the maps when %n is in a *printf call, and a setuid(getuid()) process wouldn't be able to read its own maps file. (For reference see http://lkml.org/lkml/2006/1/22/150) - a system-wide toggle is needed to allow prior behavior in the case of non-root applications that depend on access to the maps contents. This change implements a check using "ptrace_may_attach" before allowing access to read the maps contents. To control this protection, the new knob /proc/sys/kernel/maps_protect has been added, with corresponding updates to the procfs documentation. [akpm@linux-foundation.org: build fixes] [akpm@linux-foundation.org: New sysctl numbers are old hat] Signed-off-by: Kees Cook <kees@outflux.net> Cc: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/internal.h')
-rw-r--r--fs/proc/internal.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index f771889183c3..b215c3524fa6 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -37,6 +37,8 @@ do { \
37extern int nommu_vma_show(struct seq_file *, struct vm_area_struct *); 37extern int nommu_vma_show(struct seq_file *, struct vm_area_struct *);
38#endif 38#endif
39 39
40extern int maps_protect;
41
40extern void create_seq_entry(char *name, mode_t mode, const struct file_operations *f); 42extern void create_seq_entry(char *name, mode_t mode, const struct file_operations *f);
41extern int proc_exe_link(struct inode *, struct dentry **, struct vfsmount **); 43extern int proc_exe_link(struct inode *, struct dentry **, struct vfsmount **);
42extern int proc_tid_stat(struct task_struct *, char *); 44extern int proc_tid_stat(struct task_struct *, char *);