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xtensa: prevent arbitrary read in ptrace

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Prevent an arbitrary kernel read.  Check the user pointer with access_ok()
before copying data in.

[[email protected]: s/EIO/EFAULT/]
Signed-off-by: Dan Rosenberg <[email protected]>
Cc: Christian Zankel <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dan Rosenberg 2011-07-25 17:11:53 -07:00 • committed by Linus Torvalds
commit 0d0138ebe2
1 changed files with 3 additions and 0 deletions
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3
arch/xtensa/kernel/ptrace.c
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@ -147,6 +147,9 @@ int ptrace_setxregs(struct task_struct *child, void __user *uregs)
elf_xtregs_t *xtregs = uregs;
int ret = 0;
if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t)))
return -EFAULT;
#if XTENSA_HAVE_COPROCESSORS
/* Flush all coprocessors before we overwrite them. */
coprocessor_flush_all(ti);