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Blackfin arch: fix bug -- PTRACE_PEEKDATA does not seem to work which…
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… 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>
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Mike Frysinger authored and Bryan Wu committed Oct 9, 2008
1 parent dd4354f commit dabaad5
Showing 1 changed file with 31 additions and 35 deletions.
66 changes: 31 additions & 35 deletions arch/blackfin/kernel/ptrace.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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.
Expand Down Expand Up @@ -192,54 +191,51 @@ 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. */
{
unsigned long tmp = 0;
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))
Expand Down Expand Up @@ -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))
Expand Down

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