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[PATCH] x86_64: Fix canonical checking for segment registers in ptrace 

Allowed user programs to set a non canonical segment base, which would cause
oopses in the kernel later.

Credit-to: Alexander Nyberg <alexn@dsv.su.se>

 For identifying and reporting this bug.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Chris Wright <chrisw@osdl.org>
This commit is contained in:
Andi Kleen 2005-05-17 04:53:30 +00:00 committed by
parent 63a4a4f228
commit f51f3c46d7
1 changed files with 4 additions and 4 deletions
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8
arch/x86_64/kernel/ptrace.c
View File

@ -129,13 +129,13 @@ static int putreg(struct task_struct *child,
value &= 0xffff;
return 0;
case offsetof(struct user_regs_struct,fs_base):
if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
return -EIO;
if (value >= TASK_SIZE)
return -EIO;
child->thread.fs = value;
return 0;
case offsetof(struct user_regs_struct,gs_base):
if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
return -EIO;
if (value >= TASK_SIZE)
return -EIO;
child->thread.gs = value;
return 0;
case offsetof(struct user_regs_struct, eflags):