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[PATCH] x86_64: Fix ptrace boundary check
Don't allow accesses below register frame in ptrace There was a "off by one quad word" error in there. Found and fixed by John Blackwood Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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51af80e5f4
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1 changed files with 2 additions and 2 deletions
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@ -252,7 +252,7 @@ asmlinkage long sys_ptrace(long request, long pid, unsigned long addr, long data
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break;
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switch (addr) {
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case 0 ... sizeof(struct user_regs_struct):
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case 0 ... sizeof(struct user_regs_struct) - sizeof(long):
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tmp = getreg(child, addr);
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break;
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case offsetof(struct user, u_debugreg[0]):
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@ -297,7 +297,7 @@ asmlinkage long sys_ptrace(long request, long pid, unsigned long addr, long data
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break;
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switch (addr) {
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case 0 ... sizeof(struct user_regs_struct):
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case 0 ... sizeof(struct user_regs_struct) - sizeof(long):
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ret = putreg(child, addr, data);
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break;
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/* Disallows to set a breakpoint into the vsyscall */
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