Blackfin arch: fix bug -- PTRACE_PEEKDATA does not seem to work which breaks umoven() in strace

Don't add arbitrary offset when peeking at data

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 31 insertions, 35 deletions

diff --git a/arch/blackfin/kernel/ptrace.c b/arch/blackfin/kernel/ptrace.c
index bf1a51d8e60..9ce80d05e2c 100644
--- a/arch/blackfin/kernel/ptrace.c
+++ b/arch/blackfin/kernel/ptrace.c
@@ -46,7 +46,6 @@
 #include <asm/dma.h>
 #include <asm/fixed_code.h>
 
-#define MAX_SHARED_LIBS 3
 #define TEXT_OFFSET 0
 /*
  * does not yet catch signals sent when the child dies.
@@ -192,14 +191,12 @@ void ptrace_disable(struct task_struct *child)
 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
         int ret;
-        int add = 0;
         unsigned long __user *datap = (unsigned long __user *)data;
 
         switch (request) {
                 /* when I and D space are separate, these will need to be fixed. */
         case PTRACE_PEEKDATA:
                 pr_debug("ptrace: PEEKDATA\n");
-                add = MAX_SHARED_LIBS * 4;      /* space between text and data */
                 /* fall through */
         case PTRACE_PEEKTEXT:   /* read word at location addr. */
                 {
@@ -207,39 +204,38 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                         int copied;
 
                         ret = -EIO;
-                        pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + add %d %ld\n", addr, add,
-                                 sizeof(data));
-                        if (is_user_addr_valid(child, addr + add, sizeof(tmp)) < 0)
+                        pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %ld\n", addr, sizeof(data));
+                        if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
                                 break;
                         pr_debug("ptrace: user address is valid\n");
 
 #if L1_CODE_LENGTH != 0
-                        if (addr + add >= L1_CODE_START
-                            && addr + add + sizeof(tmp) <= L1_CODE_START + L1_CODE_LENGTH) {
-                                safe_dma_memcpy (&tmp, (const void *)(addr + add), sizeof(tmp));
+                        if (addr >= L1_CODE_START
+                            && addr + sizeof(tmp) <= L1_CODE_START + L1_CODE_LENGTH) {
+                                safe_dma_memcpy (&tmp, (const void *)(addr), sizeof(tmp));
                                 copied = sizeof(tmp);
                         } else
 #endif
 #if L1_DATA_A_LENGTH != 0
-                        if (addr + add >= L1_DATA_A_START
-                            && addr + add + sizeof(tmp) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {
-                                memcpy(&tmp, (const void *)(addr + add), sizeof(tmp));
+                        if (addr >= L1_DATA_A_START
+                            && addr + sizeof(tmp) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {
+                                memcpy(&tmp, (const void *)(addr), sizeof(tmp));
                                 copied = sizeof(tmp);
                         } else
 #endif
 #if L1_DATA_B_LENGTH != 0
-                        if (addr + add >= L1_DATA_B_START
-                            && addr + add + sizeof(tmp) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {
-                                memcpy(&tmp, (const void *)(addr + add), sizeof(tmp));
+                        if (addr >= L1_DATA_B_START
+                            && addr + sizeof(tmp) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {
+                                memcpy(&tmp, (const void *)(addr), sizeof(tmp));
                                 copied = sizeof(tmp);
                         } else
 #endif
-                        if (addr + add >= FIXED_CODE_START
-                            && addr + add + sizeof(tmp) <= FIXED_CODE_END) {
-                                memcpy(&tmp, (const void *)(addr + add), sizeof(tmp));
+                        if (addr >= FIXED_CODE_START
+                            && addr + sizeof(tmp) <= FIXED_CODE_END) {
+                                memcpy(&tmp, (const void *)(addr), sizeof(tmp));
                                 copied = sizeof(tmp);
                         } else
-                                copied = access_process_vm(child, addr + add, &tmp,
+                                copied = access_process_vm(child, addr, &tmp,
                                                            sizeof(tmp), 0);
                         pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);
                         if (copied != sizeof(tmp))
@@ -291,39 +287,39 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                         int copied;
 
                         ret = -EIO;
-                        pr_debug("ptrace: POKETEXT at addr 0x%08lx + add %d %ld bytes %lx\n",
-                                 addr, add, sizeof(data), data);
-                        if (is_user_addr_valid(child, addr + add, sizeof(data)) < 0)
+                        pr_debug("ptrace: POKETEXT at addr 0x%08lx + %ld bytes %lx\n",
+                                 addr, sizeof(data), data);
+                        if (is_user_addr_valid(child, addr, sizeof(data)) < 0)
                                 break;
                         pr_debug("ptrace: user address is valid\n");
 
 #if L1_CODE_LENGTH != 0
-                        if (addr + add >= L1_CODE_START
-                            && addr + add + sizeof(data) <= L1_CODE_START + L1_CODE_LENGTH) {
-                                safe_dma_memcpy ((void *)(addr + add), &data, sizeof(data));
+                        if (addr >= L1_CODE_START
+                            && addr + sizeof(data) <= L1_CODE_START + L1_CODE_LENGTH) {
+                                safe_dma_memcpy ((void *)(addr), &data, sizeof(data));
                                 copied = sizeof(data);
                         } else
 #endif
 #if L1_DATA_A_LENGTH != 0
-                        if (addr + add >= L1_DATA_A_START
-                            && addr + add + sizeof(data) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {
-                                memcpy((void *)(addr + add), &data, sizeof(data));
+                        if (addr >= L1_DATA_A_START
+                            && addr + sizeof(data) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {
+                                memcpy((void *)(addr), &data, sizeof(data));
                                 copied = sizeof(data);
                         } else
 #endif
 #if L1_DATA_B_LENGTH != 0
-                        if (addr + add >= L1_DATA_B_START
-                            && addr + add + sizeof(data) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {
-                                memcpy((void *)(addr + add), &data, sizeof(data));
+                        if (addr >= L1_DATA_B_START
+                            && addr + sizeof(data) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {
+                                memcpy((void *)(addr), &data, sizeof(data));
                                 copied = sizeof(data);
                         } else
 #endif
-                        if (addr + add >= FIXED_CODE_START
-                            && addr + add + sizeof(data) <= FIXED_CODE_END) {
-                                memcpy((void *)(addr + add), &data, sizeof(data));
+                        if (addr >= FIXED_CODE_START
+                            && addr + sizeof(data) <= FIXED_CODE_END) {
+                                memcpy((void *)(addr), &data, sizeof(data));
                                 copied = sizeof(data);
                         } else
-                                copied = access_process_vm(child, addr + add, &data,
+                                copied = access_process_vm(child, addr, &data,
                                                            sizeof(data), 1);
                         pr_debug("ptrace: copied size %d\n", copied);
                         if (copied != sizeof(data))