aboutsummaryrefslogtreecommitdiff
path: root/fs
diff options
context:
space:
mode:
authorRoland McGrath <roland@redhat.com>2009-02-06 17:34:07 -0800
committerRoland McGrath <roland@redhat.com>2009-02-06 17:34:07 -0800
commit92dc07b1f988e8c237a38e23be660b9b8533e6fd (patch)
tree4a689fbb465d7302b105678152170d8665f56ae7 /fs
parent6cec50838ed04a9833fb5549f698d3756bbe7e72 (diff)
downloadlinux-92dc07b1f988e8c237a38e23be660b9b8533e6fd.tar.gz
elf core dump: fix get_user use
The elf_core_dump() code does its work with set_fs(KERNEL_DS) in force, so vma_dump_size() needs to switch back with set_fs(USER_DS) to safely use get_user() for a normal user-space address. Checking for VM_READ optimizes out the case where get_user() would fail anyway. The vm_file check here was already superfluous given the control flow earlier in the function, so that is a cleanup/optimization unrelated to other changes but an obvious and trivial one. Reported-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Roland McGrath <roland@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/binfmt_elf.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index e3ff2b9e602..33b7235f853 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1208,9 +1208,11 @@ static unsigned long vma_dump_size(struct vm_area_struct *vma,
* check for an ELF header. If we find one, dump the first page to
* aid in determining what was mapped here.
*/
- if (FILTER(ELF_HEADERS) && vma->vm_file != NULL && vma->vm_pgoff == 0) {
+ if (FILTER(ELF_HEADERS) &&
+ vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
u32 __user *header = (u32 __user *) vma->vm_start;
u32 word;
+ mm_segment_t fs = get_fs();
/*
* Doing it this way gets the constant folded by GCC.
*/
@@ -1223,7 +1225,15 @@ static unsigned long vma_dump_size(struct vm_area_struct *vma,
magic.elfmag[EI_MAG1] = ELFMAG1;
magic.elfmag[EI_MAG2] = ELFMAG2;
magic.elfmag[EI_MAG3] = ELFMAG3;
- if (get_user(word, header) == 0 && word == magic.cmp)
+ /*
+ * Switch to the user "segment" for get_user(),
+ * then put back what elf_core_dump() had in place.
+ */
+ set_fs(USER_DS);
+ if (unlikely(get_user(word, header)))
+ word = 0;
+ set_fs(fs);
+ if (word == magic.cmp)
return PAGE_SIZE;
}