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| author | Will Deacon <will.deacon@arm.com> | 2012-02-21 12:29:03 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-03-30 12:17:33 +0100 |
| commit | 5a4f5da543b169d555a19e889850780ddceb8f98 (patch) | |
| tree | 802459fee3ff4855a99a68145fe0a9f7c5b8782a | |
| parent | fa0d1dbf7fb6b6f1af85d298a4054fe9edc914c9 (diff) | |
| download | linux-5a4f5da543b169d555a19e889850780ddceb8f98.tar.bz2 | |
ARM: 7337/1: ptrace: fix ptrace_read_user for !CONFIG_MMU platforms
Commit 68b7f715 ("nommu: ptrace support") added definitions for
PT_TEXT_ADDR and friends, as well as adding ptrace support for reading
from these magic offsets.
Unfortunately, this has probably never worked, since ptrace_read_user
predicates reading on off < sizeof(struct user), returning -EIO
otherwise.
This patch moves the offset size check until after we have tried to
match it against either a magic value or an offset into pt_regs.
Cc: Paul Brook <paul@codesourcery.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/kernel/ptrace.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index 45956c9d0ef0..80abafb9bf33 100644 --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -256,7 +256,7 @@ static int ptrace_read_user(struct task_struct *tsk, unsigned long off, { unsigned long tmp; - if (off & 3 || off >= sizeof(struct user)) + if (off & 3) return -EIO; tmp = 0; @@ -268,6 +268,8 @@ static int ptrace_read_user(struct task_struct *tsk, unsigned long off, tmp = tsk->mm->end_code; else if (off < sizeof(struct pt_regs)) tmp = get_user_reg(tsk, off >> 2); + else if (off >= sizeof(struct user)) + return -EIO; return put_user(tmp, ret); } |